PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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7. Difference between parenchyma, collenchyma and sclerenchyma

Longitudinal and cross sections of simple permanent tissues

Differences between Parenchyma and Collenchyma:

Features	Parenchyma	Collenchyma
Cell wall	It is a living tissue contains a thin cell wall made up ofcellulose.	It is a living tissue consists of a thick cell wall made up of cellulose, pectin, and hemicellulose.
Arrangement of cells	Cells areloosely arranged with intercellular spaces, and their thickness is uniform.	The tissue consists of uneven well-developed thickenings at places adjacent to intercellular spaces.
Function	It helps in the storage of food, nutrients and water.	Being a mechanical tissue gives flexibility and elasticity to the plant and prevents leaves' tearing.
Location	It is present in the inner and outer parts of plant organs.	It is located mainly in the arial parts of the plant. It is restricted to sub epidermal parts of the plant.

Differences between Collenchyma and Sclerenchyma:

Features	Collenchyma	Sclerenchyma
Nature of cells	Cells are living.	Cells are dead.
Cells are made up of	Cells contains protoplasm (It has a central vacuole and peripheral cytoplasm with an elongated nucleus).	Cells are empty.
Intercellular spaces and lumen	Intercellular spaces are absent, and the lumen of the cell is wide.	Intercellular spaces are absent, and the lumen of the cell is narrow.
Thickening of cell wall	It consists of an uneven thickening cell wall is made up of cellulose.	It consists of a uniform thickening cell wall, which is lignified.
Pits	Pits are simple straight, and unbranched.	Pits are simple oblique; sometimes, they are branched.
Function	Being a mechanical tissue gives flexibility and elasticity to the plant and prevents leaves tearing.	It helps to provide mechanical support to the plant.

Difference between Sclereids and Fibres:

Features	Sclereids	Fibres
Shape of cells	They are short and broad irregular shaped branched/unbranched cells with blunt end walls.	They are elongated and narrow thread-like unbranched cells with tapering end walls.
Arrangement of cells	Generally occur singly or in groups.	Generally occur in bundles.
Pits	Pits are deep.	Pits are narrow.
Function	It provides grittiness to fleshy fruits and stiffness and hardness to nuts and seed coat.	It provides strength and hardness.
Origin	It is derived from a secondary wall thickening of parenchyma cells.	It is directly derived from the meristematic tissue.

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