Question

The function of the Casparian strips is to

a. Divert water and minerals through the membranes of endodermal cells
b. Prevent water and minerals from entering the stele
c. Provide regulation for water and mineral movement in the plant
d. All of the above

Answer 1

The Casparian strip is a waxy barrier that regulates the movement of water and minerals into the plant's vascular system, ensuring that only necessary nutrients are allowed in while harmful substances are excluded.

Step-by-step explanation:

The function of the Casparian strip is to regulate water and mineral movement in the plant. This waxy barrier is located in the endodermis of plant roots and ensures that water and minerals must cross the plasma membranes of endodermal cells for filtration before entering the stele, or vascular cylinder. By doing this, the Casparian strip prevents harmful substances from entering the plant's vascular system while allowing necessary nutrients to pass. Furthermore, water and minerals that are already in the symplast, which means they have already been filtered by a cell membrane, can bypass the Casparian strip, making the process selective and efficient.