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What do you mean by varietal improvement?

Varietal improvement means introduction of new varieties of crop plants in our country. These varieties have good yield. They are diseases resistant. It is done by cross breeding and selection. It forms the backbone of modern agriculture.

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27 Enlist two factors that helped us to raise food production. 28 Mention any three advantages of hybrids. 30 What are the advantages of multiple cropping? 31 A farmer grows grain crops between two cereal crops. Which agricultural practice is he following?