Question

Answer in detail. 1. Explain the characteristics of meristematic tissue. Give its types and their functions.​

Answer 1

Answer:

Meristematic tissue has a number of defining features, including small cells, thin cell walls, large cell nuclei, absent or small vacuoles, and no intercellular spaces. The apical meristem (the growing tip) functions to trigger the growth of new cells in young seedlings at the tips of roots and shoots and forming buds.

Explanation:

Characteristics of Meristematic Tissue

The characteristics of meristematic tissue are as follows:  

1. The cells of these tissues are commonly called meristems.
2. 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.
3. They have very small and few vacuoles.
4. The meristematic tissue is living and thin-walled.
5. The protoplasm of the cells is very dense.
6. The meristematic tissues heal the wounds of an injured plant.
7. The cells of the meristematic tissue are young and immature.
8. They do not store food.
9. They exhibit a very high metabolic activity.
10. 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.

Meristematic Tissue On the Basis of Position

Apical Meristem

• These are present at the tips of the roots and shoots and helps in the increase of the height of the plants.  
• Various cell divisions facilitate the growth of the cells in the roots and shoots and help in cellular enlargement.
• Apical meristem is divided into-promeristem zone, which contains actively dividing cells, and the meristematic zone, which contains protoderm, procambium, and ground meristem.  

Intercalary Meristem

• It is located in the leaves and internodes at the intercalary position.
• These help to increase the length of the internode.
• It is found in grass, monocots, and pines.
• It is a part of the apical meristem and adds to the height of the plant.  

Lateral Meristem

• It is located in the stems and roots on the lateral side.
• It increases the thickness of the plant.
• Vascular cambium and cork cambium are the two lateral meristems.
• These divide preclinically or radially and give rise to secondary permanent tissues.  

Meristematic Tissue On the Basis of Function

Protoderm

• It is the outermost plant tissue and forms the epidermis.
• It protects the plants from any mechanical shocks.  

Procambium

• It is the innermost tissue and gives rise to the xylem and phloem.
• It helps in the transport of water and nutrients to different parts of the plant.

Ground Meristem

• The cells are large with thick walls.
• It forms the cortex, pericycle, and pith.

The meristematic tissue is usually found in the apices of the root systems and the shoots and is in a continuous state of division.

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Answer 2

Answer:

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