Question

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Answer 1

Answer:

1. First answer is virus.......
2. The disease like , typhoid ,malaria,ascaris,filariasis are caused by microorganism.
3. Biofertilizers are substances that contain microorganisms, which when added to the soil increases the crop yield and promotes plant growth.

uses:

Biofertilizers are required to restore the fertility of the soil. Prolonged use of chemical fertilizers degrades the soil and affects the crop yield. Biofertilizers, on the other hand, enhance the water holding capacity of the soil and add essential nutrients such as nitrogen, vitamins and proteins to the soil. They are the natural form of fertilizers and hence, widely used in agriculture.