three types of meristematie
tissue class 9
Answers
Answer:
What is Meristematic Tissue?
Carl Wilhelm von Nägeli coined the term “meristem.” Meristematic tissue contains undifferentiated cells, which are the building blocks of the specialized plant structures.
Meristematic tissues contain living cells with varied shapes. They possess a large nucleus devoid of the vacuole. The cells have no intercellular space. The zone where these cells exist is known as meristem.
The cells of the meristematic tissue divide actively to form specialized structures such as buds of leaves and flowers, tips of roots and shoots, etc. These cells help to increase the length and girth of the plant.
Let us have a detailed look at the characteristics and types of meristematic tissue.
Characteristics of Meristematic Tissue
The characteristics of meristematic tissue are as follows:
The cells of these tissues are commonly called meristems.
The meristematic tissue has the quality of self-renewal. Every time the cell divides, one cell remains identical to the parent cell, and the others form specialized structures.
They have very small and few vacuoles.
The meristematic tissue is living and thin-walled.
The protoplasm of the cells is very dense.
The meristematic tissues heal the wounds of an injured plant.
The cells of the meristematic tissue are young and immature.
They do not store food.
They exhibit a very high metabolic activity.
They possess a single, large and prominent nucleus.
Types of Meristematic Tissue
The meristematic tissue is of the following types:
Meristematic Tissue On the basis of Origin
Promeristem
The earliest and youngest meristematic tissue.
It originates from the embryo.
The primary meristem arises from the promeristem.
It is found in the root and the shoot tips.
Primary Meristem
It arises from the promeristem.
Cells divide actively.
It is present below the promeristem and forms the permanent tissue.
Secondary Meristem
It originates from the primary meristem.
The permanent tissue forms from the secondary meristem.
Explanation:
Answer:
intercalary meristem,
lateral meristem,
apical meristem
