2022-02-10 20:19:09
The Stem : Stem is the aerial part of the plant and develops from plumule of the embryo. It bears nodes and internodes.
Modifications of Stem :
In some plants the stems are modified to perform the function of storage of
food, support, protection and vegetative propagation .
• For food storage : Rhizome (ginger), Tuber (potato), Bulb (onion), Corm (colocasia).
• For support : Stem tendrils of watermelon, grapvine, cucumber.
• For protection : Axillary buds of stem of citrus, Bougainvillea get modi-
fied into pointed thorns. They protect the plants from animals.
• For vegetative propagation : Underground stems of grass, strawberry, lateral branches of mint and jasmine.
• For assimilation of food : Flattened stem of opuntia contains chlorophyll and performs photosynthesis.
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