Which of the following is true for endarch type of primary xylem?

Options

A. Protoxylem lies towards the periphery of the organ
B. Metaxylem lies towards the periphery of the organ
C. Metaxylem lies towards the pith of the organ
D. Protophloem lies towards the path of the organ

Answer

To determine which statement is true for the endarch type of primary xylem, we will analyze the characteristics of endarch xylem and its components.

### Step-by-Step Solution:

1. **Understanding Xylem Types**:
- Xylem is primarily classified into two types: endarch and exarch.
- Endarch xylem has protoxylem located towards the center (inner side) and metaxylem located towards the periphery (outer side).

2. **Identifying Components**:
- **Protoxylem**: This is the first-formed xylem and has larger lumen (the hollow part of the xylem vessel).
- **Metaxylem**: This is formed later and has a narrower lumen compared to protoxylem.

3. **Analyzing the Statements**:
- **Statement 1**: "Protoxylem lies towards the periphery of the organ."
- This is incorrect because, in endarch xylem, protoxylem is located towards the inner side.
- **Statement 2**: "Metaxylem lies towards the periphery of the organ."
- This is correct as metaxylem is indeed located towards the outer side in endarch xylem.
- **Statement 3**: "Metaxylem lies towards the pith of the organ."
- This is incorrect because metaxylem is not located towards the pith; it is towards the periphery.
- **Statement 4**: "Protoxylem lies towards the pith of the organ."
- This is incorrect as protoxylem is not located towards the pith but rather towards the center.

4. **Conclusion**:
- The only correct statement regarding the endarch type of primary xylem is that "Metaxylem lies towards the periphery of the organ."

### Final Answer:
The correct statement for endarch type of primary xylem is: **Metaxylem lies towards the periphery of the organ.**

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