Question

differentiate b/w parenchyma collencyma sclencyma

Answer 1

Parenchyma :-

1. The cells are oval, rounded or polygonal in shape.
2. They have Thin cell wall and living cells.
3. Parenchyma helps in storage of food. It also provides support to the stem of herbaceous plants. It act as a packing tissue.

Collenchyma :-

1. They are prismatic or elongated with the pointed ends.
2. They have thick wall and living cells.
3. Collenchyma provides mechanical support, elasticity, tensile strength and flexibility to the plant.

Sclerenchyma :-

1. They are isodimetric or elongated fibrelike in shape.
2. They have Thick wall and dead cells.
3. Sclerenchyma is the chief mechanical tissue of the plant which provides strength and enables them to bear various stresses.

Answer 2

☆$\underline\bold{Parenchyma:-}$

● The cells of parenchyma are living and posses the power of division.

● The parenchymatous cells are oval, round, polygonal or elongated in shape.

● The cell wall is thin and encloses dense cytoplasm containing small nucleus.

● This around a large central vacuole.

● Intercellular spaces are apendent in parenchyma.

☆$\underline\bold{Collenchyma:-}$

● They also posses living cells.

● In collenchyma intercellular spaces are absent.

● The cells are elongated and irregularly thickened at the corners.

● These tissues are located below the epidermis of dycote stem and in midribs of leaves.

☆$\underline\bold{Sclerenchyma:-}$

● They consist of dead cells and lack protoplasm.

● The walls of cells in this tissue are thickened with deposition of lignin.

● There is no intercellular space present in the cells.

● They contribute to the hardness of sead cot and nut shells.