Thursday, February 2, 2017

CBSE Class 9 -Science - Natural resources (Worksheet - Important Terms) (#cbseClass9Notes)

Natural Resources

Worksheet 
Important Terms
CBSE Class 9 -Science -  Natural resources (Worksheet - Important Terms) (#cbseClass9Notes)

Following are the statements that define specific terms related to Natural resources. Identify the terms and fill in the blanks.


1. The outer crust of the Earth.

______________


2. The region which includes all the earth's liquid water, frozen water and small amounts of water vapor in the earth's atmosphere.

_____________________


3. The mass of air surrounding the Earth.

_____________________


4. The life-supporting zone of the Earth where the atmosphere, hydrosphere and lithosphere interact and make life possible.

_____________________




5. The living components of the environment

_____________________


6. The non-living components of the environment.

_____________________


7. Control of water and electrolyte balance in the body.

_____________________


8. The cyclic transformation of chemicals through interacting biological, geological and chemical processes that causes transfer of energy and matter amid the various components of the biosphere, leading to a balance between them.

_____________________


9. A process in which anaerobic bacteria convert nitrate ions into nitrogen gas.

_____________________


10. An increase in the average temperature of the earth's atmosphere, brought about by the enhanced greenhouse effect.

_____________________


11. In the upper layer of the atmosphere, a molecule containing three atoms of oxygen is found. It is called __?___.

_____________________


12. An increase in the content of these harmful substances in air is called ?.

_____________________


13. Specific Organisms  are found to be very sensitive to the levels of contaminants like sulphur dioxide in the air. What are these organisms?

_____________________


14. Soil contains bits of decayed living organisms which is called ?

_____________________


15. An increase in the percentage of such gases in the atmosphere would cause the average temperatures to increase world-wide and this is called _?__.


____________________


Answer:

1. Lithosphere
2. Hydrosphere
3. Atmosphere
4. Biosphere
5. Biotic factors
6. Abiotic factors
7. Osmoregulation
8. Biogeochemical cycle
9. Nitrification
10. Global Warming
11. Ozone
12. Air pollution
13. Lichens
14. Humus
15. The greenhouse effect

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