Question

2. Give reasons for the following a) Skin of earthworm and gills of fish are thin, moist and richly supplied with blood capillaries. b) Leguminous crops are beneficial to farmers. c) Excessive exercise causes muscle cramps.

Answer 1

Answer:

Explanation:

1 thin and moist surface help in the process of diffusion which helps in exchange of gases and excretion

2 leguminous plants helps in nitrogen fixation which reduces the cost of fertilizer and provides good yield to farmers

3  excessive exersice leads to accumulation of lactic acid in body which leads to muscles cramp