In the Endodermis,what Structure Allows the Ions in Water to Enter

Question

In the endodermis,what structure allows the ions in water to enter or exit a cell?  
A) Transport proteins in a cell's cytoplasm
B) Transport proteins in a cell's plasma membrane
C) Sugars produced in source regions
D) Organic compounds stored in plant tissues
E) Companion cells

Accepted Answer

Transport proteins found in a cell's plasma membrane control the movement of ions and water in and out of a cell in the endodermis. These transport proteins can be regulated by the plant to selectively allow certain ions to enter or exit the cell.