Question

Thin-walled passage cells occur in

• A. Phloem elements as entry points.
• B. Testa for emergence of embryonal axis.
• C. Central area of style for passage of pollen tube.
• D. Endodermis of root for quick transport of water from cortex to pericycle.

Answer 1

The correct option is D Endodermis of root for quick transport of water from cortex to pericycle.

The endodermis of the root consists of barrel-shaped cells which have their radial and tangential walls thickened by deposition of suberin, a substance impermeable to water, called as casparian strips. Some cells have thin cell wall devoid of suberin to help in the rapid conduction of water from cortex to pericycle. They are called as passage cells.

So, the correct answer is option D.