Question

Cuticle (prevents/allows) water loss from leaves and (prevents/allows) entry of CO₂ required for photosynthesis.

a) Prevents, Allows
b) Allows, Prevents
c) Prevents, Prevents
d) Allows, Allows

Answer 1

The cuticle prevents water loss and the intake of CO₂; however, stomata regulated by guard cells allow for gas exchange necessary for photosynthesis. The correct option is C.

Step-by-step explanation:

The cuticle on a plant's leaf surface is a waxy, waterproof barrier that prevents water loss through transpiration. However, because it is impermeable to gases, it also prevents the intake of CO₂, which is necessary for photosynthesis.

To facilitate the exchange of gases, plants have developed structures called stomata, surrounded by guard cells, which can open and close to regulate the entry of carbon dioxide and the exit of oxygen and water vapor.