Q14 of 58 Page 73

What are biofertilisers? Give two examples.

Biofertilisers are used to provide additional supplement for increasing the nutrient content in the soil which helps in the overall development and growth of the plants.

For example rhizobium is used as a nitrogen fixing bacteria to fix atmospheric bacteria in the soil. Another example of biofertiliser is Nostoc a blue-green algae which increases the soil fertility and adds organic matter to the soil.


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Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of waste waters rich in organic matter. Discuss.

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(a) Discuss about the major programs that the Ministry of Environment and Forests, Government of India, has initiated for saving major Indian rivers from pollution.

(b) Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.