Question

Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall. Identify the correct option. a. Parenchyma- Cellulose, Collenchyma- Pectin and Sclerenchyma- Lignin b. Parenchyma – Pectin, Collenchyma- Cellulose and Sclerenchyma-Lignin c. Parenchyma- Lignin, Collenchyma-Pectin and Sclerenchyma-Cellulose d. Parenchyma- Cellulose, Collenchyma-Lignin and Sclerenchyma- Pectin.​

Answer 1

Answer:

Option B

Explanation:

Answer 2

Answer:

PARENCHYMA

• Relatively unspecialised cells with thin cell wall .
• Cells are living .
• Oval or spherical in shape.
• Prominent nuclei.
• Dense cytoplasm.
• No intercellular space.
• Cellulose thickened.
• It generally stores food.
• Sometimes, it contains Chlorophyll and performs photosynthesis it is called Chlorenchyma .
• In aquatic plants, large air cavities are present in Parenchyma to help them float known as Aerenchyma.

COLLENCHYMA

• Cells are living ,elongated and irregularly thickened at the corners with lignin.
• There is no intercellular spaces between them. If present very little intercellular spaces are there.
• It gives mechanical support to the plant .
• It provides flexibility to the plants .
• It helps in bending of plants without breaking.
• It is present in leaf stalks below epidermis and stem.

SCLERENCHYMA

• The cells are dead.
• Tgey are long and narrow as the walls are thickened due to lignin.
• There is no internal space inside the cell .
• It provides strength to the plants.
• It makes the tissue hard and stiff.
• It is present in stem around vascular bundles in veins of leaves and in hard covering of seeds.
• The husk of coconut is made up of sclerenchymatous tissue .

Option D is the correct option

PARENCHYMA: cellulose

COLLENCHYMA: lignin

SCLERENCHYMA: pectin and lignin both

Explanation:

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