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: -Carbon dioxide It moves by diffusion through small holes in the underside of the leaf called stomata. Guard cells control the size of the stomata so that the leaf does not lose too much water in hot, windy or dry conditions. The lower part of the leaf is a spongy layer with loose-fitting cells.

Detailed explanation-3: -Stomata are the small pores present on the leaves of the plant. Carbon dioxide enters the plants through these openings.

Detailed explanation-4: -The answer is diffusion. Amongst many gases in the atmosphere, carbon dioxide is an essential gas that plants require since they cannot undertake photosynthesis without this gas. Carbon dioxide from the atmosphere is availed to plants via the diffusion process.