Question

write 5 features of sclerenchyma, collenchyma, and pollenchyma?​

Answer 1

$\huge\mathbb{\red{PARENCHYMA-}}$

• Simple tissue made of only one type of Cell.

• Cell of parenchyma are generally isodiametric .

• They may be spherical , oval , round , polygonal shaped .

• Their wall is made up of cellulose.

• Functions - Photosynthesis , storage , secretion

$\huge\mathbb{\red{COLLENCHYMA-}}$

• This occurs in layer below the epidermis in dicot plants.

• It occurs due to deposition of cellulose, hemicellulose , pectin.

• Shape - Oval , spherical , polygonal

• Intercellular space is absent.

• Provide mechanical support to the growing parts of the plants such as young stem and petiole of the leaf.

$\huge\mathbb{\red{SCLERENCHYMA-}}$

• Consist of long , narrow , thick lignified cells.

• They are usually dead and without protoplasts.

• Sclerenchyma can be either fibres or sclereids.

• Fibres - Thick walled , elongated , pointed cells

• Sclereids :- Spherical , oval , found in fruit wall of nuts , pulp of fruits like guava , pear , sapota .

Answer 2

Answer:

Features of parenchyma:

They form basic packing tissue.

Cells of this tissue are relatively unspecialised and may be oval, rounded or elongated in shape.

Their cell walls are thin.

These cells are living.

They show large intercellular spaces.

Cytoplasm is dense with a small nucleus.

The celss possess a large central vacuole.

Parenchyma provides support to plants and also stores food

Features of Sclerenchyma:

Their cells are dead.

Cells are long and narrow.

Cells are empty and devoid of protoplasm.

Cell walls are highly thickened due to lignin deposition.

There is no internal space inside the cell.

Cells are closely packed, with no intercellular spaces.

It is a strengthening or mechanical tissue.

Features of collenchyma:

They possess living cells.

It shows deposition of extra cellulose at the corners of the cells.

Intercellular spaces are generally absenjt.

Their cells are elongated in shape