Natural Resources : Complete Set of Questions


This set of questions contains all the possible concepts
which could be asked in the examination

 

Q.1     What are the main resources on the Earth ?

The main resources on the Earth are the land, the water and the air.


Q.2     Describe the 4 spheres of the earth?

The area near the surface of the earth can be divided up into four inter-connected "geo-spheres:" the lithosphere, hydrosphere, biosphere, and atmosphere.

The names of the four spheres are derived from the Greek words for stone (litho), air (atmo), water (hydro), and life (bio).

(i) Lithosphere: The solid, rocky layer covering the entire outer crust of the Earth is called the lithosphere.

(ii) Hydrosphere: Hydrosphere is the total amount of water on a planet. The hydrosphere includes water that is on the surface of the planet, underground, and in the air. It includes the oceans, seas, lakes, ponds, rivers and streams. The hydrosphere covers about 75% of the surface of the Earth and is the home for many plants and animals.

(iii) Atmosphere: The Earth's atmosphere is a thin layer of gases that surrounds the Earth. It composed of 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and trace amounts of other gases. This thin gaseous layer insulates the Earth from extreme temperatures; it keeps heat inside the atmosphere and it also blocks the Earth from much of the Sun's incoming ultraviolet radiation.

(iv) Biosphere: Biosphere is the life-supporting zone of the Earth where the atmosphere, the hydrosphere and the lithosphere interact and make life possible, is known as the biosphere. The biosphere is composed of all living organisms. Plants, animals, and one-celled organisms are all part of the biosphere.


Q.3     What are the biotic and abiotic components of the biosphere ?

Biotic component are the living organisms of the ecosystem. These are obtained from the biosphere and are capable of reproduction.  Examples of biotic factors are animals, birds, plants, fungi, and other similar organisms.

Abiotic factors refer to non-living physical and chemical elements in the ecosystem. Abiotic resources are usually obtained from the lithosphere, atmosphere, and hydrosphere. Examples of abiotic factors are water, air, soil, sunlight, temperature, light,  minerals etc.



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