Which is not true of Pinus

Options

A. Bracts and ovuliferous scales
B. Tracheids and bordered pits
C. Resin canals and needles
D. Manoxylic wood.

Answer

To determine which statement is not true of Pinus, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Pinus**:
- Pinus is a genus of trees commonly known as pines and belongs to the gymnosperms. Gymnosperms are characterized by having naked seeds, meaning their seeds are not enclosed by an ovary wall.

2. **Analyzing Option A**:
- **Bracts and oviparous scales**:
- Pinus does have bracts and ovuliferous scales. The ovules are found on the scales, which are woody structures.
- **Conclusion**: This statement is true for Pinus.

3. **Analyzing Option B**:
- **Tracheids and border pits**:
- Tracheids are indeed present in the xylem of Pinus, and they do have border pits.
- **Conclusion**: This statement is also true for Pinus.

4. **Analyzing Option C**:
- **Raising canals and needles**:
- Resin canals are present in Pinus and help protect the plant from herbivores. The needles of Pinus also contain these resin canals.
- **Conclusion**: This statement is true for Pinus.

5. **Analyzing Option D**:
- **Monocyclic wood**:
- Pinus has pinozylic wood, which is characterized by the presence of pith. Monocyclic wood is not found in Pinus; it is typically found in other plant groups, such as cycads.
- **Conclusion**: This statement is not true for Pinus.

### Final Answer:
The option that is not true for Pinus is **D. Monocyclic wood**.

---