Question

The part of the earth where life exists, is made up of
A. Lithosphere
B. Hydrosphere
C. Atmosphere
D. All of the above

Answer 1

Hint: Life exists on land, in air, and under the water.

Complete answer: Biosphere is the part present on earth where life exists and the components are atmosphere, lithosphere, and hydrosphere.

Lithosphere- It is the outermost rigid part of the earth. It is divided into various parts like a thick crust of zero to hundred kilometers, upper mantle, and core (inner and outer cores). The earth’s crust has different layers of rocks like sedimentary rocks, granite, metamorphic rocks, basaltic rocks, etc.
The part of the lithosphere which is in contact with ocean crust and is present in ocean basins is called oceanic lithosphere whereas the part which is in contact with continental crust, is called the continental lithosphere. Various animals like mammals including humans survive on the lithosphere.

Hydrosphere- It is a combination of water presenting the earth, which includes on, above, and below the surface of the earth. The water present can be in solid form or liquid form. The water cycle comes under the hydrosphere. The water cycle has various components like- evaporation, condensation, precipitation, and reservation.
Aquatic life survives in the hydrosphere.

Atmosphere- It is composed of various layers- exosphere, thermosphere, mesosphere, stratosphere, the troposphere. The troposphere is the layer that is in most contact with the earth. It starts from sea level to ten kilometers above it.

Therefore the correct answer is (D) All of the above.

Note: The pedosphere is the uppermost layer of the lithosphere that reacts with the atmosphere and hydrosphere through soil-forming processes.