AP BIOLOGY

Detailed explanation-1: -Carbon dioxide and oxygen cannot pass through the cuticle, but move in and out of leaves through openings called stomata (stoma = “hole"). Guard cells control the opening and closing of stomata. When stomata are open to allow gases to cross the leaf surface, the plant loses water vapor to the atmosphere.

Detailed explanation-2: -Stomata are the small pores present on the leaves of the plant. Carbon dioxide enters the plants through these openings.

Detailed explanation-3: -Carbon dioxide from the air enters the leaf through the stomata.

Detailed explanation-4: -Final answer: Carbon dioxide enters the leaves of the plants through stomata and helps in photosynthesis.

Detailed explanation-5: -To control water loss from the leaf, gas exchange occurs through pores in the leaf surface, stomata, which are able to rapidly change their aperture. Once inside the leaf, CO, has to diffuse from the intercel-lular air spaces to the sites of carboxylation in the chloro-plast (for C, species) (Fig.