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BioSPhere
Biosphere includes all living things. In other words,
biosphere is the narrow zone of contact between the
land, water and air—all necessary for existence of life,
so where all these meet they prepare a platform for life.
This is known as biosphere. Every living species on the
earth is a part of the biosphere.
The Biosphere
The organisms in the biosphere are broadly divided into
plants, human beings, animals and micro-organisms. All
these organisms are interconnected and depend on each
other for survival.
Human beings and animals depend upon plants for their food.
Micro-organisms depend on the dead animals and plants,
which they convert into nutrients (humus) for plants. Plants
absorb these nutrients and make food. So, we can say, all
living things depend on each other for their survival.
Now I Know :
Our earth is the only planet where life exists.
Three main domains of the earth are lithosphere, hydrosphere and atmosphere.
There are seven continents : Asia, Africa, North America, South America, Antarctica, Europe and Australia.
There are four major oceans: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean and the Arctic Ocean.
There are five main layers of the atmosphere. Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
(Assessment of Learning Outcome)
A. Tick () the correct option :
1. The fourth largest continent is:
(a) South America (b) North America
(c) Africa (d) Asia
2. Atmosphere is related with:
(a) Land masses (b) water bodies (c) gases (d) all of these
3. How much surface of the earth is covered with water?
(a) 71% (b) 80 % (c) 59 % (d) 52 %
4. The earth is also called:
(a) Red Planet (b) Orange Planet (c) Blue Planet (d) Green Planet
5. Asia is separated from Europe by:
(a) Black sea (b) Ural mountains (c) Caspian sea (d) all of these
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