Question

different between parinchyma and colenchyma ​

Answer 1

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Parenchyma forms the "filler" tissue in the soft parts of plants, and is usually present in cortex, pericycle, pith, and medullary rays in primary stem and root. 

Collenchyma cells have thin primary walls with some areas of secondary thickening.

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Answer 2

PARENCHYMA:

Parenchyma cells are present in the epidermis, cortex, pith and pericycle. Meristematic cells are parenchymatous.

It occurs in the peripheral part of elongating organs like stem and petiole, usually appearing as a continuous ring beneath the epidermis.

Thin cell wall

Unequally thickened cell wall

Intercellular space is present

Intercellular space is absent.

No pectin deposition

Pectin deposition is found at the corners.

Shape - Isodiametric

Shape - Polygonal.

Permanent tissue

Permanent tissue sometimes revives meristematic activity.

Functions:

a) Storage of food materials.

b) Chlorenchyma carries out photosynthesis.

c) Aerenchyma helps aquatic plants in floating and gaseous exchange.

COLLENCHYMA:

It occurs in the peripheral part of elongating organs like stem and petiole, usually appearing as a continuous ring beneath the epidermis.

Thin cell wall

Unequally thickened cell wall

Intercellular space is present

Intercellular space is absent.

No pectin deposition

Pectin deposition is found at the corners.

Shape - Isodiametric

Shape - Polygonal.

Permanent tissue

Permanent tissue sometimes revives meristematic activity.

Functions:

a) Storage of food materials.

b) Chlorenchyma carries out photosynthesis.

c) Aerenchyma helps aquatic plants in floating and gaseous exchange.

Functions:

a) It gives mechanical support.

b) It can resist bending and stretching caused by winds.

c) It carries out photosynthesis if chloroplast are present.