Leaf Structure and Gas Exchange Flashcards

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What does gas exchange in a leaf mean?

It means carbon dioxide and oxygen moving between the air and the cells in a leaf.

They use oxygen and release carbon dioxide during respiration.

They are small pores in the surface of a leaf. They let gases move in and out.

Most are on the lower surface. This helps reduce water loss but still allows gas exchange.

It has many air spaces between cells. These air spaces let gases spread quickly to and from cells.

A thin, broad leaf has a large surface area. The distance for gases to diffuse is short.

They move by diffusion. This means they move from an area of higher concentration to an area of lower concentration.

It forms a waterproof layer on the surface of the leaf. This reduces water loss while still letting light pass through.

It enters through stomata on the lower surface. It then moves through air spaces in the spongy mesophyll and diffuses into the palisade cells.

Carbon dioxide mostly moves into the leaf for photosynthesis. Oxygen mostly moves out of the leaf.

It is a layer of tall, tightly packed cells with many chloroplasts. It is near the top so it gets lots of light for photosynthesis.