Question

discuss types of meristematic tissue and explain by grass regenerate again and again

Answer 1

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1. Types of meristematic tissue on the basis of origin:
i. Promeristem (primodial meristem)

ii. Primary meristem

iii. Secondary meristem

Promeristem:
Origin: embryonic origin
It is earliest and youngest meristematic tissue
It is present in growing root and shoot tip.
It give rises to primary meristem,
Primary meristem:
Origin: from Promeristem
Cell are always active and dividing
Present below promeristem in the shoot and root tip, and also in intercalary position
It give rises to secondary meristem, and primary permanent tissue.
Secondary meristem:
Origin: from primary meristem
It is developed later on life
It give rises to secondary permanent tissue


2. Types of Meristematic tissue on the basis of position:


i. Apical meristem

ii. Intercalary meristem

iii. Lateral meristem

Apical Meristem:
Position: present at apical parts of plant such as root tip and shoot tip
It helps in increase in height of plants.
Apical meristem has two distinct zone:
Promeristem zone: contains group of dividing cell (apical initials)
Meristematic zone: contains protoderms (epiderm), procambium (primary vascular tissue) and ground meristem (cortex and pith).
Intercalary Meristem:
Position: present in intercalary position in the leaves and internode
It is a part of apical meristem
It also adds to height of plants
Commonly present in monocots, grass and pines
Lateral Meristem:
Position: present on lateral side of stem and root
It helps in increases the diameter or thickness of plants.
Example: vascular cambium (primary meristem) and cork cambium (secondary meristem)


3. Types of meristematic tissue on the basis of function:
i. Protoderm

ii. Procambium

iii. Ground meristem

Protoderm:
Function: protection from mechanical injury
It gives rise to epidermis layer.
It is the outermost meristematic tissue
Procambium:
Function: transport of water and nutrition
It gives rise to vascular tissue (xylem and phloem)
It is the innermost meristematic tissue
Ground meristem:
Function: various functions
It gives rise to cortex, endodermis, pericycle and pith in dicot and hypodermis, ground tissue in monocot.
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Answer 2

Answer:  

The types of meristematic tissues are the apical meristem, intercalary meristem and lateral meristem and grass keeps regenerating again and again due to the presence of apical meristem at the tip of the plants.  

Explanation:  

The apical meristems are present at the tips of the root and the shoot system and they help in their development, the intercalary meristems help in the formation of the leaf base and the lateral meristems help in the thickening of the plant.