Leaves in desert plants are modified into spines. Why?

To bear more flowers

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To minimise water loss through transpiration

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To absorb more water

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To reduce the rate of photosynthesis

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Solution

The correct option is B To minimise water loss through transpiration
In the desert, water is scarce. More leaves mean more stomata and more water loss through transpiration. If the plants have reduced leaves or no leaves at all, it will reduce the surface area and the number of stomata. Therefore, leaves in desert plants get modified into spines.

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The spines in desert plants are modified leaves.

Cacti survive in a desert because:

a. It has a flat green stem to store water and prepare food by photosynthesis.

b. The stem is covered with a thick layer of cuticle, which helps to preserve water.

c. Its roots are distributed on the surface to absorb water.

d. Leaves are modified into spines to prevent loss of water

Cacti survive in a desert because:

a. It has a flat green stem to store water and prepare food by photosynthesis.

b. The stem is covered with a thick layer, which helps to preserve water.

c. Its roots are distributed on the surface to absorb water.

d. Leaves are modified into spines to prevent loss of water.

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