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Transport proteins of are control point...

Transport proteins of __________ are control points , where a plant adjusts the quantity and types of solutes that reach the xylem.

A

epidermal

B

Xylem

C

Endodermal

D

Pericycle

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To solve the question, "Transport proteins of __________ are control points, where a plant adjusts the quantity and types of solutes that reach the xylem," we need to analyze the given options: epidermal, xylem, endodermal, and pericyclic. ### Step-by-Step Solution: 1. **Understanding the Role of Each Option**: - **Epidermal**: The epidermis is the outer layer of cells that protects the plant from environmental factors. It does not play a significant role in the transport of solutes to the xylem. - **Xylem**: The xylem is responsible for transporting water and minerals from the roots to the rest of the plant. However, it does not control the types of solutes that enter it; it primarily conducts what is already present. - **Endodermal**: The endodermis is a layer of cells surrounding the vascular tissue in roots. It regulates the flow of water and nutrients into the xylem, acting as a selective barrier that controls which solutes can pass through. - **Pericycle**: The pericycle is a layer of cells that can give rise to lateral roots and is involved in the growth of roots but does not primarily function in the transport of solutes to the xylem. 2. **Identifying the Correct Answer**: - The endodermal cells are specifically designed to control the movement of ions and water into the vascular system, making them the control points for adjusting the quantity and types of solutes that reach the xylem. 3. **Conclusion**: - Based on the analysis, the correct answer to fill in the blank is **endodermal**. ### Final Answer: Transport proteins of **endodermal** are control points, where a plant adjusts the quantity and types of solutes that reach the xylem. ---
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