Question

differentiate between parenchyma collenchyma and schlerenchyma​

Answer 1

PARENCHYMA:-It is the living cell which provides air to make aquatic plants float.
COLLENCHYMA:-It is the living cell which provides flexibility to the parts of the plant.
SCHLERENCHYMA:-It is the dead cell which gives structural strength to the plants.

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Answer 2

Parenchyma: Parenchyma cells are found in every soft part of the plant like leaves, fruits, bark, flowers, pulp and pith of the stems.

Collenchyma: Collenchyma cells are found in petiole, leaves and young stems, appearing as a continuous ring beneath the epidermis. 

Sclerenchyma: Sclerenchyma is found in the mature parts of the plant like herbaceous perennials and woody plants.

Specialized/Unspecialized

Parenchyma: Parenchyma cells are unspecialized cells.

Collenchyma: Collenchyma cells are specialized cells.

Sclerenchyma: Sclerenchyma cells are specialized cells.

Cell Wall Thickness

Parenchyma: Parenchyma consists of a thin cell wall.

Collenchyma: Collenchyma consists of an unequally thin cell wall.

Sclerenchyma: Sclerenchyma consists of a thick and rigid cell wall.

Cell Wall Constituents

Parenchyma: Parenchyma cell wall is made up of cellulose.

Collenchyma: Collenchyma cell wall is made up of cellulose and pectin.

Sclerenchyma: Sclerenchyma cell wall is made up of waterproofing lignin.

Intercellular Space

Parenchyma: Intercellular space is present between parenchyma cells.

Collenchyma: No or little intercellular space is present between collenchyma cells.

Sclerenchyma: No intercellular space is present between sclerenchyma cells.

Shape

Parenchyma: Parenchyma cells are isodiametric in shape.

Collenchyma: Collenchyma cells are polygonal in shape.

Sclerenchyma: Sclerenchyma cells are tubular in shape.

Type

Parenchyma: Parenchyma produces permanent tissues, which can achieve meristematic activity when stimulated.

Collenchyma: Collenchyma produces permanent tissues, which can achieve meristematic activity when stimulated.

Sclerenchyma: Sclerenchyma also produces permanent tissues, eliminating the ability of dividing.

Alive/Dead at Maturity

Parenchyma: Parenchyma consists of living cells at maturity.

Collenchyma: Collenchyma consists of living cells at maturity.

Sclerenchyma: Sclerenchyma consists of dead cells at maturity. Hence, their protoplast is absent.

Function

Parenchyma: Photosynthesis, storage of food, gas exchange and floating of aqueous plants are the major functions of parenchyma.

Collenchyma: Providing mechanical support to the plant, resisting bending and stretching by the wind are the major functions of collenchyma.

Sclerenchyma: Providing mechanical support, protection and transportation of water and nutrients are the major functions of sclerenchyma.

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