Q1 of 26 Page 209

Why should preventive measures and biological control methods be preferred for protecting crops?

Preventive measures (such as use of resistant varieties of crops) and biological control methods should be used for protection of crops as they are ecologically safe, target specific pest and are harmless to other forms of life.


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1

Compare the use of manure and fertilizer in maintaining soil fertility.

 1

Which of the following conditions will give most benefits? Why?

(a) Farmers use high quality seeds, do not adopt irrigation or use fertilizers.


(b) Farmer use ordinary seeds, adopt irrigation or use fertilizers.


(c) Farmers use quality seeds, adopt irrigation, use fertilizers and use crop protection measures?

 1

What factors may be responsible for losses of grains during storage?

 1

Which method is commonly used for improving cattle breeds and why?