Test: Plant Tissues Structure And Function - Class 9 MCQ

Collenchyma allows an individual to easily bend the stem of a plant without breaking it. 

It is uniquely located at the connection of the leaf. 

The unique feature of collenchyma is because of the presence of the elongated cells and strong irregular walls in its structure.

 Also, these cells provide additional support to the entire plant.

Husk of coconut is made up of sclerenchymatous tissue.

It is present in mesocarp of fruit of coconut and a yield a coir a well known fibre used for making mats, ropes, cords, brushes e.t.c.

Sclerenchymatous tissue are found in stems( around the vascular bundle) , roots, vein of leaves, hard coverings of seeds and nuts.

The function of sclerenchymatous tissue is mainly mechanical & protective. It gives strength , rigidity ,flexibility and elasticity to the plant body.

This tissue provide support to plants and parenchyma of stem and roots stores nutrients and water and is called as STORAGE PARENCHYMA. when it contains chloroplast having chlorophyll and performs photosynthesis, it is called CHLORENCHYMA. In aquatic plants, parenchyma has large air spaces to provide buoyancy to plants to help them float and exchangegases, it is called AERENCHYMA.

Sclerenchyma cells are the permanent tissues present in the plants. They provide hardness and stiffness to the plant and are composed of dead cells. This tissue is present in stems around vascular bundles in the veins of leaves and in hard covering of seeds and nuts. e.g., the husk of coconut is made up of sclerenchymatous tissues. The cells of Sclerenchyma are long narrow and thickened due to lignin.

Collenchyma: The cells have cell walls thickened at the corners due to pectin deposition.

Sclerenchyma: Their walls are thickened due to lignin deposition.