Question

what is meristem and describe its types?

Answer 1

Characteristics of meristematic tissue:-
1) they are capable of repeated division.
2) occurs only in specific region of plant body.
3) they have dense cytoplasm,thin cell walls and prominent nuclei and they also lack vacoules.

Types:-
1)apical meristem
2)intercalary meristem
3) lateral meristem

Answer 2

MERISTEM:-

A Meristem in the plant refers to a tissue which is present in most of the plant in which the cells are undifferentiated that means the cells can divide themselves.

The cells didn't undergo any kind of differentiation and the cells are undifferentiated.
The cells can be reproduced themselves.

The cells of meristematic tissues or the Meristem can increase in height, breadth and length as the cells are not differentiated.

Undifferentiated cells can only reproduce themselves and can increase and develop themselves.
usually,
Meristems are present in the new parts of the plant or in young plants when the development is required.
moreover, it is also present in old plants but at certain places.

The cells of the Meristematic tissue lack vacuoles. They have dense cytoplasm and a prominent nucleus.

Meristematic tissues are of mainly Three types:-

1)APICAL MERISTEM (present at root and shoot tip)
2)LATERAL MERISTEM (present at the trunk)
3)INTERCALARY MERISTEM (present between the nodes of the branch)

Now,

1)APICAL MERISTEM :-

Apical Meristem are present at the root and shoot tip.
These meristematic tissues help in increasing the length of the roots and the shoot tip so that the plant can grow in height.

2)LATERAL MERISTEM :-

Lateral Meristem are present at the trunk. These are responsible for the increment of the girth of the trunk.
These help increasing the breadth of the trunk.

It is our common observation that when we see a new plant, the trunk of the new plant appears very thin and slim.
But as the time passes, the trunk grows broader and broader and when the plant gets matured the trunk becomes very big as compared to the baby plant.

This development of the trunk occurs due to the Lateral Meristem.

3)INTERCALARY MERISTEM :-

Intercalary Meristem is present between the two consecutive nodes of the branch of the tree.
This Meristem helps in the increasing the length of the branches and creating space between two consecutive nodes.

Nodes are the places from where the leaf emerges from the branch.
The space between two nodes is called as an Internode.


These are the types of meristematic tissues.
Also,
Refer the above diagram for the presence of different Meristems in the plant.