Exchange of gases occurs in leaves through

Chlorophyll

Chloroplast

Stomata

None

In botany, a stoma is a tiny opening or pore that is used for gas exchange.
They are mostly found on the under-surface of plant leaves.
In a stoma, there is the chloroplast, a cell wall, a vacuole and a cell nucleus.
Air enters the plant through these openings.
The carbon dioxide is used in photosynthesis.

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