Q20 of 69 Page 15

Name one biotic and abiotic factor, which is responsible for the damage of stored food grains.

The biotic and abiotic factors responsible for the damage of stored food grains are,
(i) Biotic factors – Rodents, insects, bacteria, fungus, etc.
(ii) Abiotic factor – Temperature, moisture, etc.

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18 State the factors, which have helped us to raise food production. 19 Which one of the following crops would require a minimum quantity of NPK or urea for its proper growth?
Cabbage, sugarcane, wheat, soyabean. 21 A farmer grows maize crop in a field year after year. He finds that the yield becomes low. Give one possible reason for it. 22 What are the characteristics, which are expected to be available in the seeds of improved varieties?