Question

Casparian strip occurs in
(a)Pericycle
(b)Endodermis
(c)Epidermis
(d)Cortex

Answer 1

Hint: It is the central, innermost layer of the cortex in land plants that contains Casparian strips. This part of the plant is cylinder-shaped and composed of compact living cells and the radial walls of these are water-resistant.

Complete answer:
Casparian strips occur in the Endodermis. It is a cell wall material that is deposited in the radial and transverse walls of the endodermis of roots. It is made up of suberin and sometimes of lignin. It regulates the water and mineral uptake by the roots.

Additional Information: - The Casparian strip is named after Robert Caspary.
-The Casparian strip is a waterproof tissue.
-The Casparian strip prevents the water from entering the pericycle except through the cytoplasm of endodermal cells and is important in producing root pressure.
- It also prevents excess soil solution from being pulled directly into the central part of the root where the xylem is located.
-Endodermis cells are also known as the passage cells.
-Active absorption occurs through the osmosis, or the use of active transport, to move molecules of a solute against the concentration gradient, forcing water into the cells of the root hairs. Passive absorption is absorption by the pull from transpiration without the active involvement of the root cells.

So, the correct answer is, ‘Endodermis.’

Note: In many seedless vascular plants, the endodermis is a distinctly visible layer of cells immediately outside the stele (the central part of the root or stem). In most of the seeded plants, especially woody types, an endodermis is absent from the stems but is present in roots.