heteroxylous wood occurs in

Options

A. angisoperms
B. gymnosperms
C. Pteridophytes
D. winteraceae, Tetracentraceae Trochondendraceae.

Answer

### Step-by-Step Solution:

1. **Understanding Heteroxylous Wood**:
- Heteroxylous wood refers to wood that has different types of xylem, specifically sapwood and hardwood. This differentiation is important for the functionality of the plant.

2. **Identifying Plant Groups**:
- The question provides several options: angiosperms, gymnosperms, pteridophytes, pitraceae, tetracentraceae, and trochondendraceae. We need to determine which of these groups is known for having heteroxylous wood.

3. **Analyzing the Options**:
- **Angiosperms**: These are flowering plants and are known to have both sapwood and hardwood, which makes them a candidate for heteroxylous wood.
- **Gymnosperms**: Typically do not have the same differentiation in xylem as angiosperms.
- **Pteridophytes**: These are non-flowering plants and do not produce wood in the same way as angiosperms.
- **Pitraceae, Tetracentraceae, and Trochodendraceae**: These are specific families within angiosperms, but they do not represent the broader category that includes heteroxylous wood.

4. **Conclusion**:
- Given that heteroxylous wood is primarily found in dicotyledons, which are a subgroup of angiosperms, the correct answer is **angiosperms**.

### Final Answer:
Heteroxylous wood occurs in **angiosperms**.

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