Question

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Answer 1

Answer:

Permanent tissues are those tissue which has lost the power of cell division. Cells of 'permanent tissues' are matured, assume a definite shape, size and function. On the basis of constituents call, permanent tissues are classified into three types: simple, complex, and secretory or special tissues

Explanation:

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Answer 2

Answer:

The tissue that are completely grown and have lost the ability of division are known as permanent tissues. The meristematic tissues divide and differentiate to form the permanent tissues.

TYPES OF PERMANENT TISSUES

Simple permanent tissue

These are also known as homogenous tissues. They are made up of single cells usually with the same origin, structure and function.

SIMPLE PERMANENT TISSUES ARE FURTHER DIVIDED INTO THREE TYPES

(1) Parenchyma

•The cells have an oval or round shape.

•The cell wall is made up of hemicellulose or cellulose.

•The cell is thin-walled.

•The cells have vacuoles and very small nucleus.

•It is found in all parts of the plant.

•The protoplasm is living and dense.

(2) Collenchyma

• Cells are long and thick walled.

•The cell wall is made up of cellulose and pectin.

•It is the only tissue with the highest refractive index due to the presence of pectin.

•The amount of chloroplast is less in the cells.

•The cells have no intercellular spaces.

(3) Sclerenchyma

•These are dead tissues,very hard and rigid in texture

•Cells are thicked wall with various shapes and size.

•These provide mechanical support and rigidity to the plant.

Complex permanent tissue.

The complex tissues are made up of various types of cells carrying out distinct functions and are of two types.

(1) Xylem

•It transports water and nutrients from the roots to leaves of the plant.

•It provides support to the plants.

•It is divide into: Tracheids,vessels,xylem fibres and xylem parenchyma.

(2) Phloem

•It translocates the prepared organic food from the leaves to different parts of the plant body.

•It is also known as bast.

•It is composed of sieve tubes,companion cells,phloem fibres and phloem parenchyma.

Explanation:

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