The lower portion of atmosphere contains ______________.
Carbon dioxide
Hydrogen
Oxygen
None of these
The environment comprises of ________ major spheres.
Two
Three
Four
Five
Natural environment consist of _____________.
Air
Water
Land
Air, water and land
____________ consists of all the life forms environment.
Biological environment
Physical environment
Human environment
_____________ occurs about 29% of the total surface area of the Earth.
Biosphere
Atmosphere
Lithosphere
Hydrosphere
Physical environment is also known as ______________.
Natural environment
Man,plants and animals are a part of ______________.
The body of Earth is known as ____________.
There are ________ kinds of environments.