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Why earthworm is called the friend of farmer?

Biology - Exemplar Problems

Chapter 7. Structural Organisation in Animals


Because earthworms helps farmer by loosening the soil and adding humus to it..
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Because of their feeding habbits, earworm loosen the soil and make it aerated so that the roots of plants grow down deeper and get plenty of oxygen. The nitrogenous waste excreated by earthworms make soil rich in nitrogenous compounds that increases soil fertility. Therefore, earthworms are called farmer's friend.
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