In the figure below,the line with the arrows indicates the cell-wall pathway for an absorbed nutrient.

What structure actually regulates the entry of nutrients into the plant's interior?

Question

In the figure below,the line with the arrows indicates the cell-wall pathway for an absorbed nutrient.

What structure actually regulates the entry of nutrients into the plant's interior?

Quizplus · Accepted Answer

The plasma membrane of the endodermal wall controls the entry of nutrients into the plant's interior, as it forms a selective barrier known as the Casparian strip. This strip regulates the movement of water and solutes through the endodermal cells, forcing them to pass through the selective transport mechanisms of the plasma membrane before they can enter the vascular tissue. The root cap protects the root tip and does not play a role in nutrient uptake, while the plasma membrane of root hairs and the cell wall of root hairs are involved in nutrient absorption but not regulation of entry into the plant's interior.

In the Figure Below,the Line with the Arrows Indicates the Cell-Wall