Answer:
The various
stem modifications are as follows
Stem
Modification of
Stem for Storage of Food
Rhizome
In this case the stem becomes
underground and grows horizontally, stores food material. It bears nodes,
internodes and buds which give rise to aerial shoots, e.g., ginger, banana,
turmeric.
Stem
Modification of
Stem for Storage of Food
Corm
Stem is underground, grows
vertically and bears nodes as well as internodes e.g. Colocasia.
Bulb
In this case, the stem
becomes underground, the internode is shortened in such a way that the leaves
are condensed and these leaves become thick and fleshy and store food
material e.g.,-onion.
Tuber
This is also a special kind
of stem modification, which arises at the tips of special narrow underground
branches. They have nodes, internodes apical buds, scale leaf in the form of
ridge. They gave no. of eyes which represent nodes. It is meant for storing
food material, e.g., potato
Stem tendrils
Modification of Stems for
Climbing These are found in cucurbits and grapevine. The axillary buds of the
stem become elongated and spirally coiled and twine around a support for the
plant to grow as the stem is weak and herbaceous.
Modification of Stem for
Protection These are present in the axil of leaf or apex of stem performing
the function of either climbing or defence, .g., Duranta, Calamus and also
reduce transpiration.
You need to login to perform this action.
You will be redirected in
3 sec