Thursday, January 20, 2022

BIO(Production of Food from Animals)

 

            Production of Food from Animals


                    Animal Husbandry:
                
             Farmers adopt different methods of management for getting better yields in agriculture. In the same way, care is also required in the management of rearing animals. Providing food, shelter, protection
and breeding of animals is called ‘Animal husbandry.

Since long time, we have been using animals not only for obtaining food but also for agriculture, transportation etc. We realized their importance and domesticated them.

Cattle Rearing:
People living in rural areas used to
domesticate animals like cows, buffaloes,
bullocks, goats, sheeps, pigs, hens, etc.
Supplying of nutritious food,
accommodating clear and hygienic shelters
for animals are very important issue in
animal husbandry. Generally villagers send
their animal to graze at the places where
grass is easily available.
• Where do people rear their animal in
your village?

           Cattle House








Have a talk with them and collect
information about cattle rearing. For this
you need a questionnaire. Following
questions may be helpful to you. You can
add some more questions as you wish

• What are the cattle here?
• At what places fodder is available?
• What are the places where water is
available?
• What are the necessities of rearing of
cows, buffaloes, goats and sheep?
• What are the major problems that
animal rearers generally face?
Earlier, villagers used to appoint a
person for cattle rearing and was paid by
them. This kind of practice is gradually
disappearing from our villages. Some of
the farmers keep their cattle in the sheds.
They do not take their cattle to the fields.
They supply fodder in those sheds. Rearing
cattle like bulls, cows and buffaloes in large
scale is also the same in sheds. Generally
the farmers in our country are cultivating
the land area of less than one hectare. Even
though mechanization is increasing in
agriculture, farmers use bullocks for
ploughing and other agricultural practices.
• Make a list of agricultural practices by
using bullocks and the buffaloes.
Rearing of goats and sheep is also
related to agriculture. Besides agriculture,
cattle rearing and sheep rearing are
beneficial to farmers. During off season for
cropping cattle rearers make fences in the
fields at off crop seasons. They keep their
sheeps and goats in the fenced enclosures
• Think in which way this practice is
helpful to the farmer as well as field
crops.
Taking care of animal health is equally
important task in animal husbandry. Most
of the times cattle sheds become unclean
because of the remains of fodder, dung and
urine. Dump these wastes away from the
shed. Care should be taken to prevent the
growth of lice and mytes on cattle’s body.
Foot and mouth disease is a common 
and dangerous disease partially in
cows and buffaloes. Sheep and goats suffer
from worm infections.

Milk Production:
Our government treats producing milk
as an industry. We get milk from cattle.

Among cows, traditional species give
2 – 5 liters of milk per day. Murra, species
are reared in most of the districts in our
state. They give up to 8 liters of milk per
day. Haryana, Jaferabad, Nagapuri are the
traditional varieties of cows in our country
which give good quantity of milk. Jersy
(England) and Holstein (Denmark) are the
Foreign varieties. They give 25 liters of
milk per day. These foreign varieties are
cross bred with our native or local varieties.
They give 8 to 20 liters milk per day. Cows
play vital role in total milk production of
our country.

    Holstein Cattle









Out of milk produced in our country
60% is used to prepare cheese, khova, ghee,
curd, milk powder and other milk products.
There are number of dairy farms in our
state. The milk in dairy farm is collected
from households and pasteurized. Milk is
preserved in packets and transported.
     
          Milk collection








   Is there a milk collecting centre in your
village?
• How do they collect milk and export?
• Do you know how they decide cost of
milk?
• Where is milk chilling center located
in your area? (For this you need to 
observe milk packets which are
available in the market)
There are private and government milk
collecting and chilling centers in our state.












Practices in livestock keeping:
Being high milk yielding varieties, livestock (The animals that are used for milk and agriculture are called livestock) rearing is very important. Traditional livestock are becoming depleted because
of hybrid varieties. Let us read the following case study to know how local breeders conserve their livestock.

Poultry:
Production and rearing of hens on a large scale is generally
called poultry. Billions of hens are reared worldwide
for eggs and chicken. We know that farmers rear
cocks and hens in villages. Most of these are local varieties
We get around 74% chicken and 64% of eggs only 
from poultry farms. Poultry has emerged as one 
of the major industries in last two decades. India
achieved 3rd position in the world by producing 
90 million eggs per annum. And also placed in 
7th position in the production.
• Are the hens reared in the poultry is same as our
 traditional varieties reared by farmers in the villages?
Generally poultry farms are of two types. 
One is for production of eggs and other for meat. 
Broilers are commonly used variety in poultry. 
They are reared for meat. Layer are reared
for the production of eggs.

            Local Varieties   











Natural, wild varieties grow fully in
5 to 6 months. But broilers grow fully in
just 6 to 8 weeks. This happens due to
genetic modification in the hens.
New Hampshire, white Plymouth,
Rhode Island Red, white leg horn, Anoka
are the foreign varieties of meat giving
species.

         Broiler chicken











Some hens reared only for production
of eggs. Some hens are able to lay 300 to
350 eggs in their life span. But, one has to
follow proper management techniques up
to 21 to 72 weeks for getting eggs.

During January to April, egg prices are
high. Do you know what is the reason? This
is because of most of the eggs are used for
hatching. In this period, rate of hatching is
more. Hatchability of eggs is generally
influenced by 37 to 38°C temperature. In
poultry industry hen wastes (litter) is used
as nutritional manure in agriculture.
Egg is a nutritious food. 











Sources of nectar:
Plants which contain nectar and pollen
liked by bees are called bee flora.
The following are some of the more
important plants either wild or cultivated.
Fruit trees like citrus, apple, guava,
tamarind; Cultivated field crops like
mustard, gingelly, wheat, cotton, sunflower;
Vegetable plants like beans, lady's finger,
brinjal; Timber yielding trees like acacia,
neem, sal and bushes, shrubs and natural and
ornamental flower plants are all the sources
of nectar. The bees of a colony sometimes
rob another colony especially during
drought period.

              Bee Hive









Production of honey in large scale is
by providing artificial bee hives. The hive
consists of floor board, brood chamber,
super chamber, top cover, inner cover,
frames and entrance rod. These parts can
easily be separated.

          Artificial bee hive












The hive may be double walled or single
walled. These artificial hives are not similar
to natural hives. Try to find out the
differences between these two hives. To get
more yielding of honey from the colonies
a bee keeper has to follow some
management techniques. Various pests and
predators attack the honey bee colonies.
Wax moths, wasps, robber flies, dragon
flies attack honey bee colonies. King crow,
Bee eater are more harmful during swamp
period. Bee keepers should protect bee
hives from the pests and predators.

Fisheries:
Fish constitute an important and rich sources 
of high quality animal protein. India has a coast
line of about 7500km and the total available area for
fishing both inshore and offshore is nearly
0.48 million square meter. In addition there
are extensive inland water areas comprising
of numerous rivers, fresh water and brackish 
water lakes, reservoirs, tanks, ponds, swamps, etc.

                   Prawns















                    Fish  










                   Crabs















Marine Fisheries:
Marine fish are caught using many kinds of 
fishing nets through fishing boats. With the 
introduction of synthetic fiber nets, there has 
been revolution in fishing gear material. 
Fishermen catch fish by using machines is 
called mechanized fishing. 
They catch tons of fish everyday.

          Mechanized fishing










Inland fisheries:
Fresh water resources include canals,
ponds, reservoirs and rivers. Brackish water
resources, where seawater and fresh water
mix together, such as estuaries and lagoons
are also important fish reservoirs. Fishing
is also done in such inland water bodies,
but the yield is not high.

               Fish pond










Generally farmers rear only one type of fishes or Prawns. 
More intensive fish farming can be done in composite fish 
culture systems. Both local and imported fish species are 
used in such systems. In such a system, a combination of
five or six fish species are used in a single fishpond. 
These species are selected so that they do not compete 
for food among them and have different types of food habits.
As a result, the food available in all the parts of the pond 
is used. As Catlas are surface feeders. Rohus feed in the
middle zone of the pond, Mrigals and common carps are
bottom feeders, and Grass Carps feed on the weeds. 
This species can use all the food in the pond without 
competing with each other. This increases the fish yield 
from the  pond. Even if one species of fishes are
infected with disease it is not spread to others.


One problem with such composite fish culture is that many of these fishes breed only during monsoon. Even if fish seed is
collected from the wild, it can be mixed with that of other species as well. So, a major problem in fish farming is the lack
of availability of good quality seed. To overcome this problem, we have now been worked out to breed these fish in ponds using hormonal stimulation. This has ensured the supply of pure fish seed in desired quantities.







BIO(Difficult to Breathing and Drinking)

           Not for Breathing Not for Drinking

        
             What is Environmental Pollution ?
The environment is made up of living
and non-living components which are inter
dependent. When everything is working the
way it should be, all the components of the
environment will be functional, healthy and
balanced in the nature.
• What will happen if harmful organisms
or substances enter your body? How
do you feel?
In the same way if something harmful
is introduced into the environment and it
gets disrupted it can cause a chain of
problems affecting all the resources, plant
and animals life. These changes really hurt
the health and well being of living
organisms. Pollution therefore can be
described as the disturbance of
environmental balance caused by human
activities. It can also be caused by chemical
substances, biological species or by
dangerous radiations including sound and
heat.
Pollution is the addition to the
environment (air, water, land) of harmful
substances or energy in quantities that are
harmful to life.

What is Air pollution?
The composition of air in the
atmosphere comprises four major gases
namely nitrogen, oxygen, argon and carbon
dioxide. Other substances are present in a
very little amount and hence, they are
collectively known as trace components.

Air Pollutants:
As we discussed above, air pollutants
arise from both man made and natural
processes. These pollutants are of two
types : Primary and Secondary pollutants.
Pollutants are also defined as primary
pollutants resulting from combustion of
fuels and industrial operations and
secondary pollutants, those which are
produced due to reaction of primary
pollutants in the atmosphere.


 Natural Activities:
• Forest fires release carbon particles
(ash) into the air and pollute the air.
• Volcanic eruption releases various
gases and ash into the atmosphere.













• Decay of organic matter releases
Ammonia gas into the air.
• Decay of organic matter lying under
water releases Methane gas.
• The pollen grains released by plants
remain suspended in the air and pollute
it.


Human activities
 Burning fuels
Burning fuels pollute the air producing
pollutants like carbon monoxide, sulphur
dioxide, smoke, soot and ash.













• Name the fuels burnt in day to day
activities in both rural and urban areas.

Vehicles: Exhaust gases emitted by
motor vehicles pollute air by producing the
harmful pollutants like sulphur dioxide,
nitrogen dioxide, carbon monoxide,
unburnt hydrocarbons, lead compounds and
soot.









Industries: Various industries like
granite, lime, cement etc., pollute air by
releasing pollutants such as sulphur
dioxide, nitrous oxide, chlorine, fly ash ,
dust, asbestos dust etc.
• Name the factories located nearby. How
do they affect the air and water there?
Nuclear power plants: The two
problems of nuclear power are radioactive
waste and the possibility of disasters like
Chernobyl. Nuclear waste is dangerous
because it can cause cancer and other
health problems. The radioactive wastes
possess radio activity for at least one
million years. The other problems are melt
downs. Melt downs are provoked by too
much heat in the power plant. During a melt
down the power plant makes more
Radioactive pollution.

Chernobyl Disaster
The biggest meltdown of Nuclear
power reactor in the world was in
Chernobyl, Soviet Union in 1986. After the
melt down of chernobyl, there was an
explosion and formation of radioactive
cloud. The radiation released during this
disaster directly killed hundreds of people
and affected around 5 million more. About
125,000km2
 of fields were unusable
because of the radioactive clouds. The
forest area was damaged by the radioactive
clouds.










Granite industries are in the most
polluted areas because granite powder,
cement dust, limestone dust is released
into the air causing pollution
are releasing the pollutants like
fly ash, Sulphur dioxide, and radioactive
substances causing the air, water and land
pollution. People are suffering from lung
cancer and skin allergies due to the
pollutionThe people living near the
granite factory have faced several health
problems like respiratory bronchitis and
asthma. Thermal power plants pollute air
by emitting sulphur dioxide, radio-active
substances and fly ash.

Power Generation Plants
There are a number of power generation 
plants in our country. Some produce power
by using water (Hydroelectric power plants),
by using coal and gas (Thermal power plants), 
by using Radioactive elements like Uranium
(Nuclear power plants). Electricity is also
produced from the air and tides of the
oceans. Ash dust and SO2 from the thermal
power plants are polluting the environment.












Deforestation: It is the destruction
of forests and woods. It has resulted in the
reduction of indigenous forests. Forests
now cover only 19% of the earth’s land
surface. Plants use carbon dioxide for the
process of photosynthesis. Due to lack of
forests the consentration of carbon dioxide
is increasing day by day resulting in global
warming. Discuss about the adverse effects
of Global warming?









Fertilizers and Pesticides: Use of
fertilizers and pesticides in agriculture
pollute not only air but also land and water.
You already learnt these issues in the
chapter ‘Production of food from plants’.











Chloro Flouro Carbons (CFC):
CFCs are used in refrigerators, Air
conditioners and aerosol sprays. Use of
CFCs pollutes air by depleting the ozone
layer as a result of which, harmful
ultraviolet rays reach the earth. What ill
effects do we suffer from exposure to UV
rays?
 Mining: Mining of coal and stone
releases coal dust and stone dust that cause
air pollution.

What are the effects of air
pollution?
Air pollution continues to evoke a great
deal of interest worldwide due to its
negative impacts on human health and
welfare. It causes certain diseases including
shortness of breath, sore throat, chest pain,
nausea, asthma, bronchitis and lung cancer.
Extreme effects of air pollution include
high blood pressure and cardiovascular
problems.
The World Health Organization states
that 2.4 million people die each year from
causes directly attributable to air pollution
(WHO, 2007).
In addition to its negative health
impacts, air pollution is known to cause
injuries to animals, forests and vegetation,
and aquatic ecosystems.

Various harmful effects of
pollutants
Particulate Matter: Dust and smoke
spoil our cloths, reduce visibility and
affect the buildings; dust and smoke
get deposited on the leaves of the
plants. Thus affects the rate of
photosynthesis and transpiration. They
also cause Bronchitis, Asthma in
human beings. Particles of lead oxide
present in automobile exhaust can
cause Anaemia, Brain damage and even
death. Particles of mercury cause
Minimata disease which affect the
nervous system and can cause death.
Hydrogen Sulphide: Tarnishes silver
objects and blackens lead paints and
painting. It has a smell like Rotten
Eggs. It causes head ache in humans
when inhaled in a large quantity.
Carbon monoxide: It is a poisonous
gas. If it combines with haemoglobin
in our blood, it forms a stable
compound called carboxy
haemoglobin. Due to the formation of
this compound haemoglobin is unable
to carry oxygen to various parts of our
body. This leads to respiratory
problems. It causes suffocation and
may cause even death.


What can we do to reduce air
pollution?
Air pollution cannot be totally
eliminated, it can however be controlled.
Some of the methods for controlling air
pollutions are:
• Tall chimneys should be installed in 
all factories to reduce air pollution
at the ground level.
• The 'Fuel burning equipment' which
burns the fuel completely should be
used in homes and industries.
• Install electrostatic precipitators in
the chimneys of industries.
• Reduce vehicular emissions by using
non polluting fuels like CNG.
• Use LPG for domestic use.
• Improve the quality of fuel in
automobiles and use catalytic
converters in them.
• Make use of Renewable alternative
source of energy like Solar Energy,
Wind Energy and Hydro Energy.
 All motor vehicles should be
maintained properly so that they
comply with pollution norms.
Use unleaded petrol
Plant and grow more and more trees in
your surroundings.

Where is all of this pollution
coming from?
There are two main sources of water
pollution; definite and non-definite
sources.












Definite source pollution is due to
discharges from a single source, such as
an industrial site. It includes factories,
wastewater treatment facilities, septic
systems, and other sources that are clearly
discharging pollutants into water sources.
Non definite-source pollution involves
many small sources that combine to cause
significant pollution. For instance, the
movement of rain or irrigation water over
land picks up pollutants such as fertilizers,
herbicides and insecticides carries them
into rivers, lakes, reservoirs, coastal
waters, or groundwater. Non-definite
sources are more difficult to identify, as
they cannot be traced back to a particular
location. Landfills can also be a nondefinite source of pollution, if substances
leach from the landfill into water supplies.

Biodegradable waste: This consists
mainly of human and animal waste. The
biodegradable waste enters the water supply
and thus pollute the water. The waste
provides an energy source (organic carbon)
for bacteria. Organic carbon is converted
to carbon dioxide and water, which can
cause atmospheric pollution and acid rain;
this form of pollution is far more
widespread and problematic than other
forms of pollutants as a large supply of
organic matter in the water provides an
opportunity for oxygen-consuming
(aerobic) bacteria to multiply quickly,
consume all available oxygen, and kill all
aquatic life.

Sediment: It is one of the most
common sources of water pollution.
Sediment consists of mineral or organic
solid matter that is washed from land into
water sources. Sediment pollution is
difficult to identify, because it comes from
non-definite sources such as
constructional, agricultural, logging,
flooding, and city runoff. Sediment can
cause large problems, as it can clog
municipal water systems, smoother aquatic
life, and cause water to become
increasingly turbid. Turbid water can cause
thermal pollution, because it absorbs more
solar radiation.



Prevention And Controlling of
Water Pollution
Water pollution can be prevented or
minimized by adopting following
measures.
• Toxic industrial wastes should be treated
chemically to neutralize the harmful
substances present in it before
discharging into rivers and lakes.
• The sewage should not be dumped in to
the rivers directly. It should first be
treated at the sewage treatment plant to
remove the organic matter from it in the
form of manure.
• The use of excessive fertilizers and
pesticides should be avoided.
• The use of synthetic detergent should be
minimized or biodegradable detergents
should be used.
• Dead bodies of human beings and
animals should not be thrown in to rivers.
• The excreta and other garbage should be
treated in a biogas plant to get fuel as
well as manure.
• The water of rivers, streams, ponds and
lakes should be purified or cleaned. This
can be done both by the industries and
the govt. For example Ganga action plan
launched by the Indian Government.
• Trees and shrubs should be planted along
the banks of the rivers.
• There should be general awareness
among the masses regarding the harmful
effects of water pollution and the ways
of prevention. Waste paper, plastics,
waste food materials and rotten food and
vegetables should not be thrown in to
open drains.







BIO(Bio-geo-chemical cycles)

                 Bio-geo-chemical cycles


            Bio-geo-chemical cycles
A constant interaction, between the
biotic and abiotic components of the
biosphere, makes it a dynamic, but stable
system. These interactions consist of
transfer of matter and energy between the
different components of the biosphere.
Bio-geo-chemical pathways determine the
path of transfer of matter on earth. Let us
look at some of the major biogeochemical
cycles.
Bio-geo-chemical cycles as we may
see from the name itself includes both
biological, geological and chemical or
physicochemical pathways. This means the
reservoir or pool of nutrients on earth may
contain some chemicals of biological
origin while others may be purely inorganic
in nature also may be geochemical
(obtained from rocks and soil) in origin.
Water though not considered as a biogeo-chemical cycle by most ecologists
actually is the precursor of the major
elements Hydrogen and Oxygen as some
living organisms use them for making the
basic food molecules for several
organisms in nature.
Water is also a universal solvent and
essential for various reactions to take place
within a living cell. Thus we shall also take
up water cycle briefly in this chapter.
Though the nutrient pool involves several
elements of nature but, we shall study just
the cycling of some major elements like
Oxygen, Nitrogen and Carbon.

The water cycle
All the water that is on the earth has
always been here? Earth never gets water
added to it nor does water disappear from
the earth. Water is constantly recycled in a
process known as the Hydrological or
Water cycle.
Fresh water is more scarce than you
might think.Nearly 97% of all the water on
the earth is in the oceans, and so only about
3% is fresh water. About 2% of this fresh
water is permanently frozen in Glaciers and
at the Polar Ice caps.
Thus only about 1% is available fresh
water. Again about 1/4 of this 1% is present
as groundwater. Only about 0.009% of
water on earth is in the rivers and lakes.
Rest is present in the bodies of living
organisms, as soil moisture, as humidity of
atmosphere etc. Water is the most essential,
abundant substance in living things.
The human body for example, is
composed of about 70% water (remember
all living organisms together constitute
only 0.005% of water on earth). Water
participates in many biochemical
mechanisms, including photosynthesis,
digestion and cellular respiration. It is also
the habitat for many species of plants,
animals and microorganisms, and it
participates in the cycling of the materials
used by living things. So, it is important
that we protect our water
resources.













The Nitrogen cycle
Nitrogen is both the most abundant
element in the atmosphere and, a building
block of proteins and nucleic acids. The
Nitrogen cycle is a complex
biogeochemical cycle in which Nitrogen
is converted from its inert atmospheric
molecular form (N2
) into a form that is
useful in biological processes.
The element Nitrogen is constantly
moving in a giant circle from the air,
through the soil, into the bodies of plants
and animals, and eventually back to the air
by the process of Nitrogen cycle. All living
things need nitrogen mainly for growth,
repair and development (Nitrogen being
essential for protein formation). Even
though the Earth’s atmosphere is made up
of 78% nitrogen, plants and animals cannot
use it in this form.
The atmospheric nitrogen is thus
converted into certain compounds which
plants may take up from the soil by some
biochemical process (caused by certain
bacteria like Rhizobium, Nitrosomonas etc)
and physicochemical processes (caused by
lightning). Animals get the required amount
of nitrogen from plants either directly
(herbivores) or indirectly (carnivores).
The nitrogen cycle contains several
stages:

1. Nitrogen fixation:
Atmospheric nitrogen occurs primarily
in inert form (N2) or non reactive form that
few organisms can use; therefore it must
be converted into a compound - or fixed -
 form in a process called nitrogen fixation.
Most atmospheric nitrogen is ‘fixed’
through biological processes. A number of
bacteria and blue green algae are known to
be able to fix atmospheric nitrogen into
compounds in their own body. These may
be symbiotic (Rhizobium) or freeliving
(Nitrosomonas) respectively. These
organisms convert atmospheric nitrogen
into the organic nitrogen for their own
cells. As they die rapidly( they grow rapidly
as well), this nitrogen, now present in the
soil as compounds become available to
plants. In leguminous plants like pea, beans
etc there is a symbiotic relationship of the
nitrogen fixing bacteria with the plant.


2. Nitrification:
Nitrates can also be converted to
Ammonia by the de Nitrifying Bacteria in
the soil (especially in waterlogged soils).
The nitrifying bacteria may then use this
ammonia to synthesize compounds for
their own cell and eventually convert to
Proteins, Nucleic acids, Nitrites and
Nitrates. Nitrites are produced mainly by
Nitrosomonas, while nitrates by
Nitrobacters that are also capable of
utilizing nitrites and converting them to
nitrates. Death of these microorganisms
add the nitrogenous compounds to the soil.
Plants take up nitrate as well as ammonium
ions from the soil to convert them to
proteins and nucleic acids.


3. Assimilation:
Nitrogen compounds mainly as nitrates
or ammonium ions(NH4+) are taken up
from soil by plants which are then used in
the formation of plant proteins and as
animals eat these plants, animal proteins
are synthesised.

4.Ammonification:
Production of Ammonia (NH3
) from
Nitrates and other Nitrogenous compounds
in called Ammonification.
Describe a path of ammonification
discussed in the above section.
Ammonification also occurs when
plants and animals die, or when animals
emit wastes, the nitrogen in the organic
matter reenters the soil and water
bodies where it is broken down by
other microorganisms, known as
decomposers. This decomposition
produces ammonia which is then
available for other biological
processes.

5.Denitrification:
Nitrogen makes its way back into
the atmosphere through a process
called denitrification, in which
solid nitrate (NO3) is converted back to
gaseous nitrogen (N2). Denitrification
occurs primarily in wet soils where water
makes it difficult for microorganisms to
get oxygen. Under these conditions, certain
organisms - known as denitrifiying bacteria
- will process nitrate to gain oxygen,
leaving free nitrogen gas as a byproduct.
Thus, the nitrogen content of the earth
and its atmosphere remains in a perfect
balance.

Human intervention and nitrogen
cycle

Unfortunately, humans are interfering
with the natural balance when they overuse
artificially produced nitrates as agricultural
fertilizers that are often washed into water
bodies by rain as well as by releasing
exponential amounts of untreated domestic
sewage into water bodies. Before these
nitrates can be converted into atmospheric
nitrogen, they are often carried off by rain
or irrigation to streams and rivers and even
seep down to groundwater.











In some parts of the world, water for
humans and animals contains such high
concentrations of nitrates that it is unsafe
for consumption. These excessive amount
of nitrates and other nitrogenous
compounds, when they reach rivers and
lakes, cause too much algal growth. This
over-abundance of algae uses up too much
of the oxygen in the water. When oxygen
level falls, other forms of life in the water
bodies die off.

The Carbon cycle
Carbon is found in various forms on the
Earth. It occurs in the elemental form as
say Soot, Diamond and Graphite. In the
combined state, it is found as gases, Carbon
dioxide and Carbon monoxide in the
atmosphere, as carbonate and hydrogen
carbonate salts in various minerals, while
all life-forms are composed of carbon
containing molecules like Proteins,
Carbohydrates, Fats, Nucleic acids and
Vitamins. The endoskeletons and
exoskeletons of various animals are also
formed from carbonate salts.




Carbon dioxide is also responsible for
maintaining the Earth as a Green house with
temperature conditions suitable for life.
Thus, Carbon exists in the biosphere as the
central element of life. Carbon Dioxide or
CO2
, now makes up about 0.04% by volume
of air.
Have you ever thought how this level
of Carbon is being maintained in the
nature?
Carbon is incorporated into life
through various processes. The main
reservoirs of carbon are sedimentary rocks,
fossilized organic carbon including the
fossil fuels, the oceans, and the biosphere.

Photosynthesis:
The first step in the biological
carbon cycle is the conversion of
inorganic atmospheric carbon into a
biological form. This ‘fixing’ of
carbon in biological form takes place
within plants and other organisms -
 known as producers - in a process
called photosynthesis, by which
energy from sunlight is converted into
chemical form.
In photosynthesis, light energy
helps to combine carbon dioxide and
water to create the simplest of sugars,
the carbohydrate molecules known as
Glucose (C6H12O6). In oceans,
photosynthesis is carried out by
microscopic aquatic plants called
phytoplankton. The carbohydrates
then become the source of chemical
energy to cells in all plants and
animals. In plants, some carbon
remains as simple glucose for short-term 
energy use, while some are converted
to large complex molecules such as starch
for long term energy storage.











The Green house effect:
A greenhouse is a small house made of
glass that is used to grow plants. It traps
the sun’s rays and keeps the heat from
escaping. It is warm inside. In the same way
that the glass traps heat in a greenhouse,
some gases present in the atmosphere such
as Carbon di Oxide, Carbon monoxide,
Methane and Water vapour trap heat from
radiating back to the space. The natural
greenhouse gases act like a big blanket
around the earth, keeping it warm and
making life possible without which
temperatures would have fallen to sub zero
values. This phenomenon of naturally
warming up is called ‘‘Greenhouse effect”.
But the extent of this natural warming
up process have been grossly affected now.
Due to various human activities like burning
of fossil fuels, deforestation and
industrialization, an excessive amount of
carbon dioxide and other green house gases
has been emitted to the environment. As a
result more heat gets trapped. This causes
the temperature of the earth to rise, which
results in Global Warming. 












Oxygen cycle:
Oxygen is an abundant element,
next to Nitrogen, on our Earth. It is
found in the elemental form in the
Atmosphere to the extent of nearly 21%.
It also occurs extensively in the combined
form in the Earth’s Crust as well as in the
air in the form of carbon dioxide. In the
crust, it is found as the oxides of most
metals. It is also present as carbonate,
sulphate, nitrate and other compounds. It
is also an essential component of most
biological molecules like carbohydrates,
proteins, nucleic acids and fats (or lipids).
















The cycle and storage:
 Oxygen from the atmosphere is used
up mainly by the processes, combustion,
respiration and in the formation of oxides
of elements like Nitrogen, Iron etc. Oxygen
is returned to the atmosphere in only one
major process, that is, Photosynthesis.


Ozone layer:
The Earth’s atmosphere is divided into
several layers. The lowest region, the
Troposphere, extends from the Earth’s
surface up to about 10 kilometers (km) in
altitude. Virtually all human activities occur
in the Troposphere. Mount, Everest, the
tallest mountain on the planet, is only about
9 km high. The next layer, the Stratosphere,
continues from 10 km to about 50 km.
Most commercial airline traffic occurs in
the lower part of the Stratosphere. most
atmospheric ozone is concentrated in a
layer in the stratosphere, about 15-30
kilometers above the Earth’s surface.
Ozone is a molecule containing three
Oxygen atoms. It is blue in colour and has
a strong odour.
Normal oxygen, which we breathe, has
two oxygen atoms and is colourless and
odourless. Ozone is much less common
than normal oxygen. Out of each 10 million
air molecules, about 2 million are normal
Oxygen, but only 3 out of 10 millions are
Ozone.







Wednesday, January 19, 2022

BIO(Soil Pollution)

                 Soil Pollution


         Our living Planet, consists of
Atmosphere, Earth and Water. The
interaction of the Atmosphere,
Lithosphere, Hydrosphere and Biosphere
is continuing for years together. It was
clean and enjoyable. But due to the various
activities of man, the composition and
complex nature of environment got
changed. The activities include
industrialization, construction,
transportation, agriculture and
deforestation etc.., Such activities are
though desirable for human development
and welfare release unwanted materials into
the environment causing it to be imbalanced
rendering our life miserable.

What is soil?
Air, water and soil are three major
natural resources, alongside soil is one of
the marvellous products of nature without
which there would be no life. It is a natural
medium for plants to grow.
















Soil is made up of minerals and
decomposed organic matter, along with air
and water. Soil is a habitat for many
organisms like, bacteria etc.., which in turn
feed and support plant life.
Healthy soil means the soil which
produces healthy plants, on eating which
animals also remain healthy.

How is soil formed?
Soil formation is a long and complex
process and it can take 100 to 10,000 years
to create one inch of top soil! It is driven
by many factors such as Climate,
Topography, living organisms and the type
of parent material. Parent materials come
from break down of underlying rocks or
from deposits by streams and rivers, seas
and gulfs, hills, wind and glaciers or organic
plant residues.
Over time, these materials are
weathered by the effects of freezing,
thawing, wetting, drying, heating, cooling,
erosion, plants, animals and from chemical
reactions. Eventually the parent material is
divided into three horizontal layers, the top
layer consists of mostly organic matter and
biological activity, the middle layer is the
zone of maximum material accumulation
and the bottom layer is mainly the parent
material.
The top soil is important since it is the
foundation for the life on the earth.


Soil properties:
Crop quality directly depends on
the quality of the agricultural soil in which
it is grown. The higher the quality of the
soil, the higher the quality of the crop
produced. To improve how to obtain high
quality soil, we must first understand the
fundamental properties of soil. These can
be divided into three major categories 
physical, chemical and biological
properties.







Physical properties of soil:
Soil comprises of minerals, organic
matter, water and air. The composition and
proportion of these components greatly
influences physical properties of soil
including colour texture, structure and
porosity. These properties regulate and
affect air and water movement in the soil
and thus, soil ability to function. Organic
matter is the organic component of soil
which includes the dead and decaying
plants, animals and residues of organisms.
It consists of nutrients necessary for
plants growth such as Nitrogen, Phosphorus
and Potassium. Soils which contain 30%
or more organic matter are considered
organic soil; all other soils are identified
as mineral soils. Organic matter in soil
improves water infiltration, decreases
evaporation, and increases the water
holding capacity. Also, where there is
organic matter, there will be numerous
organisms present helping to convert it
back to nutrients and these organisms help
to create crumb, ideal for cultivation. Thus
balancing a natural state of soil.















Chemical properties of soil:
The term pH is used to indicate the level
of acidity or alkalinity of a soil. The range
of pH values of a good soil lies from 5.5
to 7.5. Below pH 7 the soils are termed as
acidic and above pH 7 alkaline.
The pH of soil is important to know the
type of vegetation that grows in the soil and
the type of organisms that live there. Also,
presence of organic matter in soil has a
close relationship with soil pH. Soil richer
in organic matter is acidic in nature as a
result of degradation of various substances
that produces various acids in soil.
Availability of plants nutrients depends on
the pH of soil.

Biological properties of Soil:
Soil is not a dead mass but an abode of
millions of organisms. It is the most
abundant and diverse ecosystem on the
earth. Soil organisms include both plants
and animal forms ranging from sub
microscopic Viruses to Earthworms, to
large burrowing animals such as Gophers
and ground Squirrels. Major microbial
groups in soil are bacteria, fungi, algae and
protozoa. These feed on plant residues
burrow the soil and help in aeration and
percolation of water.

This is the basis of nutrient cycles in all major ecosystems of the world. Besides their role in controlling the rates of production of inorganic forms from various organic forms, soil microbes, particularly, soil bacteria also control the forms of ions in which these nutrients occurs. We shall study this in detail in the chapter of ‘Biogeochemical cycles’.

SOIL FERTILITY:
How can you say that soil is fertile one. Discuss with your classmate write your opinion.
Fertility of soil depends on the properties of soil and is defined by its capacity to hold
water and nutrients and supply them to plants when they need them, independent of direct
application of nutrients. Transfer of nutrients from the soil’s organic matter to the mineral
stage strongly depends on the soil organisms’ activity and diversity. Soil organisms also
contribute to buildup soil organic matter, including Humus, the soil’s most important nutrient reservoir.

Proper soil fertility management is
very important for successful crop
production and farming. Organic farmers
regulate soil fertility by protecting the soil
and feeding it organic material, thus
ensuring quality yield. When the soil is
fertile in the organic sense, it can produce
good crop yields for several years. You
learned about organic farming in the
chapter 'Challenges in improving
agriculture.












Soil Pollution:
As we discussed above, soil serves as
the interface between Earth, Air and Water;
fulfilling a variety of complex,
interdependent functions essential to life.
Yet human activities alter its ability to
perform its job. As compared to the other
resources, it has taken a long time to
become aware of the wealth, complexity,
usefulness and fragility of the Soil. When
the quality of Air and Water deteriorates,
the threat to public health is felt
immediately. But as long as we can walk
on the earth under our feet, where’s the
danger?
The impacts of various human
activities for development and welfare are
invisible and land pollution is a good
example of that. We can’t easily see the
poisons that seep from underground
Mines, the Garbage we have dip into
landfills or from Industrialization,
Agriculture and other mismanagement by
human being. Land pollution, in short, is a
much bigger and more subtle problem than
it might appear. How does it occur? And
what can we do about it? These are the
questions to think about. But first let us
understand up to what extent we are as
human being, responsible for producing this
waste.
Let us read the following conversation
and prepare the list as per the instructions.
During interval time Venu was eating a
fruit. He was about to throw the peel in
corner of the varandah. His friend Ramu
stopped him. Ramu said you should not
throw waste in the varandah. Drop it in the
bin / basket.
Now let us think, what will happen if
you throw the wastes where ever you want?
Prepare a list of waste materials we
throw out in a day from morning to evening
classifying them as wet wastes and dry
wastes with the help of the example given
in the table below.

Activity-1:
Dumping and decomposing
We are producing tonns of wastes in
our daily activities. It is dumped at
wherever the vacant place is available in
Urban as well as Rural areas. Some of these
Can you imagine the quantity of waste we produce in a day and what happens to the waste materials we throw or dispose?

Activity-2:
Take a polythene bag/plastic bucket /
or any container. Fill half of it with soil.
Keep wet waste and other wastes in it.
(Waste should include vegetable peels,
rubber, plastic etc). Add some more soil
and sprinkle water regularly on it. Till it and
observe in 15 days intervals. 

The waste generated from various
sources can be categorized into two types:
i) Biodegradable waste includes
substances that can be degraded by
microbes into harmless and non-toxic
substances.Agricultural and animal wastes
like leaves, twigs, hay, dung, etc. are
biodegradable wastes
Decomposition is the process of
degradation of materials into simpler
substances turning them into nutrients and
making available to plants.Thus, biodegradable materials contribute directly to
the fertility of the soil. However when there
is an excess of bio-degradable material, it
contributes the imbalance in the nature with
negative impact. On the other hand, nonbiodegradable materials directly contribute
to land pollution due to the excessive
amount and improper waste management.
Thus, soil or land pollution can be
understood as addition of substances which
adversely affect the quality of soil or its
fertility. Farmers use cow dung every year
in the fields. Polluted water also polluts
soil. Solid waste is a mixture of plastics,
cloth, glass, metal, organic matter, sewage,
sewage sludge, building debris, generated
from households etc.., commercial and
industrial establishments add to Soil
Pollution. Fly ash, iron and steel slag,
medical and industrial wastes disposed on
land are important sources of soil pollution.
In addition, fertilizers and pesticides from
agricultural use which reach soil as run-off
as well as land filling by municipal
waste are growing causes of soil pollution.
Acid rain and dry deposition of pollutants
on land surface also contribute to soil
pollution.

ii) Non-biodegradable waste cannot be
easily degraded. Aluminium cans, plastics,
glass, chemicals like DDT, etc. are
examples of non-biodegradable wastes.
Radioactive wastes produced during
nuclear reactions take a long time to decay
and are harmful to human beings. Now -adays 'e-waste' (computers, mobile waste)
also leads to soil pollution.

Causes of land pollution:
There are many different ways by which
land pollution can occur. Soils are
commonly used as dumps for household
and industrial wastes. In many intensively
farmed areas, leaching of nutrients from
manure or inorganic fertilizers and
effluents from processing plants may lead
to high level of nitrate and other chemicals
in ground water. Due to atmospheric
deposition (air pollution) soil gets
contaminated significantly. soil pollution
can be classified into the following
categories based on sources:
Agricultural Soil Pollution
Soil pollution by industrial
effluents and solid wastes
Pollution due to urban activities
Soil pollution is caused by the
presence of man-made chemicals or other
alteration in the natural soil environment.
This type of contamination typically arises
from the rupture of underground storage
links, application of pesticides, and
percolation of contaminated surface water
to subsurface strata, oil and fuel dumping.


Biomagnification:
The nutrients necessary for plant growth
(e.g., Nitrogen and Phosphorus) are found
at very low concentrations in most natural
waters. In order to obtain sufficient
quantities for growth, Phytoplankton must
collect these chemical elements from a
relatively large volume of water.
In the process of collecting nutrients,
phytoplankton also collects certain humanmade chemicals, such as some persistent pesticides.

 Bio magnification












Deforestation:
Soil Erosion occurs when the
weathered soil particles are dislodged and
carried away by wind or water.
Deforestation, agricultural land
development, temperature extremes,
precipitation including acid rain, and human
activities contribute to this erosion.
Humans speed up this process by
construction, mining, cutting of timber,
over cropping and overgrazing. It results in
floods and soil erosion.
Forests and grasslands are an excellent
binding material that keeps the soil intact
and healthy. They support many habitats and
ecosystems, which provide innumerable
feeding pathways or food chains to all
species. Their loss would threaten food
chains and the survival of many species.
During the past few years quite a lot of vast
green land has been converted into deserts.
Deforestation is slowly destroying the most
productive flora and fauna areas in the
world, which also form vast tracts of a very
valuable sink for Co2.

 Deforestation











Pollution due to urbanization:
Pollution of surface soils
Urban activities generate large
quantities of city wastes including several
Biodegradable materials (like
vegetables, animal wastes, papers,
wooden pieces, carcasses, plant twigs,
leaves, cloth wastes as well as
sweepings) and many nonbiodegradable materials (such as plastic
bags, plastic bottles, plastic wastes,
glass bottles, glass pieces, stone /
cement pieces). On a rough estimate
Indian cities are producing solid city
wastes to the tune of 50,000 - 80,000
metric tonns every day. If left
uncollected and decomposed, they are a
cause of several problems such as:
Clogging of drains: Causing
serious drainage problems
including the burst / leakage of
drainage lines leading to health
problems.
Barrier to movement of water:
Solid wastes have seriously
damaged the normal movement of
water thus creating problem of
inundation, damage to foundation
of buildings as well as public health
hazards.
Foul smell: Generated by dumping
the wastes at a place.
Increased microbial activities:
Microbial decomposition of
organic wastes generate large
quantities of methane besides many
chemicals to pollute the soil and
water flowing on its surface
As solid wastes and hospital wastes
create many health problems: They
may have dangerous pathogen
besides dangerous medicines, injections.


Solid waste management:
The solid wastes which are accumulated
on the soil will pose a great problem to us.
Throwing the wastes in dump yards is not
the solution to the problem. For throwing
wastes we need enormous land area.
For example in the state of Telangana
32 towns are there The average per capita solid wastes
produced per day is 364 grams. To dispose
all the wastes we need an area equal to the
size of Hyderabad city(590 sq km) by the
year 2021.
Thus, Proper methods should be
adopted for management of solid waste
disposal. Solid waste management involves
activities including collection, transfer and
transport to suitable sites, and safe disposal
of wastes by methods which are
environmentally compatible.

Industrial wastes can be treated
physically, chemically and biologically
until they are less hazardous. Acidic and
alkaline wastes should be first neutralized;
the insoluble material if biodegradable
should be allowed to degrade under
controlled conditions before being
disposed.