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21 . Which part of plant contains nitrogen fixing bacteria?
A. Roots B. Stems
C. Leaves D. All the above

22 . Green revolution is
A. Crop variety improvement
B. Judicious use of fertilizers 
C. Expansion of irrigation
D. All the above

23 . Organic farming is
A. enhancing biodiversity
B. promoting soil biological activity 
C. farming without using pesticides and chemical fertilizers 
D. all the above

24 . Percentage of nitrogen in earth's atmosphere is
A. 12% B. 21%
C. 78%  D. 98%

25 . The major objective of the family welfare programs in India is
A. Disease control
B. Employment generation
C. Population growth rate control
D. None of these




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