Question

classification of plants based on their structure of steam

Answer 1

the stems are classified into:
1) underground stem
2) sub aerial modification of stem
3) aerial stem modification

Answer 2

Based on the structure of the stem, plants are primarily classified into three categories:

Herbs – These have delicate green stems.

Shrubs – They have hard and bushy stems with branches.

Trees – They have very hard and thick stems that are referred to as trunks.
Some classifications include two other categories as well. They are:

Creepers – They have very fragile stems and cannot support the entire plant weight. They can also not stand straight and grow by spreading horizontally on the ground.

Climbers – They too have weak stems, but their stems are a bit stronger than creepers. They can grow vertically on some support and bear their own weight.