The Five Year Plan has given an important place to the co operative movement, as a major form of organisation in many branches of economic activity.
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It is a general concept that iron cuts iron. Keeping this view under consideration many harmful insects have been killed by using virus. The mouth disease of rabbit is cured by using Myxonea virus. It kills pests.
Bacteria are also beneficial to the human beings in many ways in spite of their many harmful effects. They have a great role in agriculture. Bacteria help in decaying of organic substances, increase the fertility of soil, help in ammonification, nitrification and fixation of nitrogen.