Question

Casparian strips occur in
a. Longitudinal and radial of epidermal cells
b. Longitudinal walls of xylem
c. All walls of endodermis
d. Radial walls and tangential walls of endodermis

Answer 1

Hint: Plants roots take nutrients from the soil and by osmosis process transport to the other parts of the plants. The vascular tissues present in the plants known as the endodermis that compartmentalize the root and control all plant nutrients transport from the soil to the vascular walls of the plants.

Complete answer:
Vascular tubes present in the plants help to prevent the backflow of nutrients from the stele. There are two types of endodermal cells that undergo two types of specialized deposition in the two impermeable polymers present in the cell walls of the plant.

Endodermis is a boundary layer present in the vascular cylinder and helps to fill space between the cell walls. This space is filled like a waterproofing material and waxy like material present in it that prevents the water and other minerals from dissolving in the water. Waterproofing material present in the cortex of the cell walls.

The waxy waterproof layer that’s surrounding the epidermis is called a casparian strip. Under the microscope we can observe the ring of cells that’s present in the endodermis. And the ring of cells called the “pericycle”. And the layer attached with the pericycle is nondescript and attached with the lateral roots of the cell and these cells dividing and then dividing again and again and we will get mass of cells forming. The cortex present in the cell walls isn’t very reinforced by hard materials because of that these cells are crushed and pushed as the lateral roots grow through.

Hence, the correct answer is option (C).

Note: This process we can observe under the microscopic slides and known as pericycle. Lateral roots that’s emerging into the outside roots also known as an independent root. Casparian stops the process observed by the two small peptides obtained by the vasculature that diffuse into the apoplastic space in the order to test endodermal barrier integrity in the roots.