Question

Give reasons:
a. Why does cactus plant have long roots and leaves
reduced to spines?
b. Why does a fish have slippery scales on its body?​

Answer 1

Answer:

a. The leaves in a cactus plant are modified into spines to prevent the loss of water. ... Loss of water from the leaves tend the roots to pull more water from the ground. The cactus plant grows in a desert where there is a shortage of water.

b. Fish secrete a glyco-protein slime from the cells in their skin to make it harder for parasites to attach. Some fish even secrete toxins into the slime to deter predators. Fish scales provide protection and reduce water turbulence.

Answer 2

Answer:

a. The leaves in a cactus plant are modified into spines to prevent the loss of water. ... Loss of water from the leaves tend the roots to pull more water from the ground. The cactus plant grows in a desert where there is a shortage of water.

b. Fish secrete a glyco-protein slime from the cells in their skin to make it harder for parasites to attach. Some fish even secrete toxins into the slime to deter predators. Fish scales provide protection and reduce water turbulence.