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Here is your answer -
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MERISTEMATIC TISSUE -

It's a simple tissue which is composed of group of similar and immature cells (meristematic cells) which can divide to form new cells.

Breifly Discription -

Characteristics of meristematic tissue -
✓ They have ABILITY to grow and divide.
✓ They have small and immature cells.
✓ Intercellular spaces are absent.
✓ may be rounded, oval or polygonal shaped.
✓ Cells have dense cytoplasm and CONSPICUOUS nucleus.
✓ Endoplasmic Reticulum are small.
✓ Mitochondria posses simple structure.
✓ Instead of Plastid, proplastids are present.
✓ Rate of Respiration is very high.

Types of Meristematic tissue (on the basis of positions)

1. Apical Meristem - Present on the tip of stem and roots. They are responsible for growth of length of plant.

2. Intercalary Meristem - Present at intercalary position (at nodes). They help in elongation of the organs.

3. Lateral Meristem - They are found on the lateral side. They are responsible for increment in thickness.
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PERMANENT TISSUE -

The group of cells which have lost the capacity to divide and have achieved permanent shape and size are known as Permanent tissue.

They are of three types -
Simple Permanent Tissue.
Complex Permanent Tissue.
Special Permanent Tissue.
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SIMPLE PERMANENT TISSUE -

Group of similar permanent cells having same function are known as Simple Permanent Tissue.

They are of three types -
1. Parenchyma - They are most abundant and common tissue made up of thin walled similar isodiametric cells. Their cell wall are made up of cellulose.
Function -
✓ Storage of food.
✓ Provide turbidity to softer parts.
✓ Provide rigidity.
✓ It Protects and checks water loss.
✓ It forms water absorbing epiblemma.

2. Collenchyma - Generally they have elongated cells. They are circular, oval or angular in TRANSVERSE section. They contains Chloroplast.
Found in - epidermis of petioles, leaves and stems of dicots.
Functions -
✓ Provides MECHANICAL strength.
✓ Prevents tearing of leaves.
✓ Also provides flexibility to the organs.
✓ They contains Chloroplast so, they participate in photosynthesis.

3. Sclerenchyma - They are simple supportive tissue having highly thick-walled cells with less or no protoplasm.. Thickning of wall may be made up of cellulose or LIGNIN or both.
Functions-
✓ They are chief mechanical tissue of a mature plant organ.
✓ It allows plant organs for bending, shearing, compression and pull caused by wind and other environmental factors.
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In every section first paragraph provides you short definitions about your questions and rests are brief descriptions to give some basic ideas.
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