2. Definition:
“The aggregate of all the circumstances, people, things,
and events around us that influence our life.”
“The circumstances, or conditions by which one is
surrounded.”
-Webster dictionary
Source: Environmental studies(F.Y.B.Com)
-Rashmi Desai (Vipul Prakashan)
3. Origin of Word „Environment?‟
French Word-
„environner‟
To encircle or surround
4. Classification of environment….
Environment
Physical/Natural
Human environment
environment
Cultural
Social
Land, air, water, etc. Plants and animals Economic
Political
environment
5. Components of environment…..
Abiotic components:
All those physical and chemical aspects of environment that
exert an influence on living organism.
(1)lithosphere:
SiAL(Silica+Aluminimum)
that make up landmasses or
continents.
SiMA(Silica+Magnesium)
that forms beds of oceans.
6. (2) Hydrosphere:
Includes all oceans, seas, lakes, rivers that cover 71%
of earth surface.
7. (3)Atmosphere:
A 100% envelope around
earth.
Air comprises of 78% nitrogen,
21% oxygen, 0.03% of carbon
dioxide and several other gases
in small quantities and varying
amounts of water vapour.
It is approx. 320km thick.
8. Biotic components:
Include living organism i.e. plants, animals, man and their organisation
within the environment.
(1)Producer(autotrophic):
Able to make their own food by
trapping solar radiation with help of
chlorophyll. E.g. plants.
They convert light energy into
chemical potential energy.
9. (2)Consumers(hetrotrophic):
They do not make their own food.
Dependent on other organism for their
nourishment.
They includes:
a) Primary consumer(HERBIVORES):
Consist of animal that feed on
green plants. E.g. grasshopper or cow.
b) Secondary
consumer(CARNIOVORES):
They Obtain energy by eating
herbivores. E.g. frog or tiger.
c) Tertiary consumer(OMNIVORES):
They feed secondary consumers.
E.g. snake or bear.
10. (3)Micro consumers or detritivores:
Include molluscs, earthworms, millipedes etc.
which feed on dead organic matter.
(4)Decomposers or reducers:
Include bacteria and fungi which breakdown complex compound of dead plants and
animals, absorb some of decomposition products and release mineral nutrients that
can be reused Primarily by PRODUCERS.