In photosynthesis, atmospheric carbon dioxide primarily enters the leaf through which structure?
Stomata
Stomata are tiny pores present mostly on the lower epidermis of a leaf, each bounded by a pair of guard cells that regulate the opening and closing of the pore.
Atmospheric carbon dioxide, required as a raw material for photosynthesis, diffuses into the leaf's internal air spaces through these open stomatal pores and reaches the mesophyll cells where the light and dark reactions of photosynthesis occur. Stomata also allow oxygen and water vapour to exit the leaf.
Root hair cells absorb water and minerals from soil, the general leaf epidermis is largely covered by a waxy, gas-impermeable cuticle, and lenticels are pores found on woody stems, not leaves — so stomata is the structure specifically responsible for gas exchange in leaves.
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