Question

which type of modification clum is ?here it is given tthat it is unbrnaced erect cylindrical stout axis with distinct nodes and internods but cant fit in my brain.HELP ME OUT​

Answer 1

Explanation:

Erect, unbranched stems with distinct nodes and internodes are called culms, nodes are swollen giving a jointed appearance. For example, bamboo

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Answer 2

Answer:

To perform specialized functions the stem and the aerial branches get modified in different ways which is called as stem modifications. These modifications are of 3 kinds, viz., underground, sub-aerial and aerial. The sub-aerial modifications are also called metamorphosed stem because their structures are massively modified and sometimes cannot be predictable as stems.

Underground stem modifications

The underground stem modifications form are specialized stems, which are not positively phototropic, they belong to herbaceous plants, acquire various sizes and shapes and store food as carbohydrate in the form of starch. They keep the plant alive during unfavorable condition and with the initiation of favorable condition; they produce the aerial shoot and spread by vegetative means. The general functions of underground stem modifications are:

[i] Storage of foodstuffs.

[ii] They act as per-enacting organs, surviving through unfavorable conditions.

[iii] They act as vegetative propagating organs