Which of the following constitute endodermis and pericycle respectively, in a monocot root?

Options

A. Innermost layer of cortex and outermost layer of cortex
B. Innermost layer of stele and outermost layer of stele
C. Innermost layer of stele and outermost layer of cortex
D. Innermost layer of cortex and outermost layer of stele

Answer

To determine which tissues constitute the endodermis and pericycle in a monocot root, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Monocot Root**:
- Monocot roots have a distinct arrangement of tissues. The root is made up of various layers, including the epidermis, cortex, endodermis, pericycle, and vascular tissues.

2. **Identify the Endodermis**:
- The endodermis is the innermost layer of the cortex in the root. It acts as a selective barrier that regulates the flow of water and nutrients into the vascular system.

3. **Identify the Pericycle**:
- The pericycle is located just outside the vascular tissue (xylem and phloem) and is responsible for the formation of lateral roots. It is the outermost layer of the stele.

4. **Distinguish Between the Two**:
- In a monocot root, the endodermis is characterized by the presence of the Casparian strip, which is a band of cell wall material that is impregnated with suberin and lignin. The pericycle, on the other hand, is made up of parenchyma cells and is found adjacent to the vascular bundles.

5. **Conclusion**:
- In summary, the endodermis is the innermost layer of the cortex, while the pericycle is located just outside the vascular bundles in the stele of a monocot root.