Question

write notes on scherenchyma​

Answer 1

ANSWER :

TISSUES : A group of cells having a common origin  and similar functions are termed as tissues.

PLANT TISSUES HAVING TWO TYPES :

1. Meristematic tissues

2. Permanent tissues

Sclerenchyma is the type of ​Permanent tissues.

Permanent tissues : Formed from meristematic tissues, the cell in the tissue loose the ability to divide. Permanent tissues are divided into 2 categories :

i) Simple permanent tissues :

a) Parenchyma

b) Collenchyma

c) Sclerenchyma

ii) Complex permanent tissues :

a) Xylem

b) Phloem

                                      SCLERENCHYMA :

• Composed of long , narrow and thick walled cells.

• This tissue is made up of dead cells and there are no intercellular spaces.

• Sclerenchyma cells are dead, present in seeds, nuts , husk of coconut, fibre of jute, etc.

• Their walls are thickened due to lignin deposition.

• They are not flexible and non living cells.

• Sclerenchyma having two types :

i) Sclereids        and           ii) Fibres

• They are specialised cells and providing mechanical support.

• In this vacuoles are absent.