Biology / Unit 11 Bio 2535 short lesson, about 20 seconds
Leaf Structure: Mesophyll, Stomata, Veins
Captions available
The idea
A leaf's interior mesophyll houses the chloroplasts driving photosynthesis; its epidermis contains stomata, gas-exchange pores flanked by guard cells; and its veins carry vascular tissue.
In practice
Palisade mesophyll's tightly packed cells sit above looser spongy mesophyll, whose air spaces let gases reach the stomata.
Where people slip
Guard cells are the only epidermal cells containing chloroplasts, giving them a photosynthetic role most epidermal cells lack.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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