Which is not true of Pinus

Options

A. Three needles in spur of P. roxburghii
B. Xylem is towards inner side of vascular bundles of stem
C. Homosporous gymnosperm
D. Microsporophyll has two microsporangia.

Answer

To determine which statement is not true about Pinus, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand the Characteristics of Pinus**:
- Pinus is a genus of trees in the gymnosperm group, known for having naked seeds and needle-like leaves.

2. **Evaluate Option A**:
- "Three needles in spur of P. roxburghii."
- This statement is true. Pinus roxburghii typically has three needles per fascicle (bundle).

3. **Evaluate Option B**:
- "Xylem is towards the inner side of vascular bundles of stem."
- This statement is also true. In vascular plants, including Pinus, xylem is located towards the inner side of the vascular bundles.

4. **Evaluate Option C**:
- "Homosporous gymnosperms are there."
- This statement is not true for Pinus. Gymnosperms, including Pinus, are generally heterosporous, meaning they produce two different types of spores (microspores and megaspores).

5. **Evaluate Option D**:
- "Microspore has two microsporangia."
- This statement is true. In Pinus, the microsporophyll (the structure that bears microspores) contains two microsporangia.

6. **Conclusion**:
- The statement that is not true about Pinus is option C: "Homosporous gymnosperms are there."

### Final Answer:
The statement that is not true of Pinus is **option C: Homosporous gymnosperms are there**.

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