Question

Why do cactus have spines instead of leaves?

• A. Both A and B
• B. To prevent excess photosynthesis
• C. Neither A nor B
• D. To prevent water loss by transpiration

Answer 1

The correct option is D To prevent water loss by transpiration

In desert regions, there is scarcity of water. Transpiration occurs through the stomata present in leaves. When leaves get converted to spines, less stomata are exposed to the environment, which decreases water loss by transpiration. So, to preserve water, the desert plants convert their leaves into spines.