What is a leaf? Where does it arise from? How is it borne on a stem? What is its function?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Definition: A leaf is a lateral, flattened, green outgrowth of the stem specialized for photosynthesis.
Origin: Arises from the shoot apical meristem at nodes
Arrangement: Borne on stem nodes in acropetal succession (youngest at top, oldest at base)
Functions:
- Photosynthesis (primary function)
- Transpiration (water loss regulation)
- Gaseous exchange (stomata)
- Vegetative reproduction (Bryophyllum)
- Storage (onion, Aloe)
- Protection (spines in cactus)
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