Hydrostereom or transfusion tissue is found in

Options

A. Gymnosperm roofs
B. Gymnosperm leaves
C. Gymnosperm stems
D. All the above.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where hydrostereom or transfusion tissue is found among the given options related to gymnosperms.

2. **Identifying the Options**: The options provided are:
- A) Gymnosperm root
- B) Gymnosperm leaf
- C) Gymnosperm stem
- D) All of the above

3. **Defining Transfusion Tissue**: Transfusion tissue, also known as hydrostereom, is a specialized type of tissue found in certain plants, particularly gymnosperms. It is involved in the conduction of water and nutrients.

4. **Analyzing Each Option**:
- **A) Gymnosperm root**: Transfusion tissue is not typically found in the roots of gymnosperms. Therefore, this option is incorrect.
- **B) Gymnosperm leaf**: Transfusion tissue is characteristically found around the vascular bundles in gymnosperm leaves. This option is correct.
- **C) Gymnosperm stem**: Similar to roots, transfusion tissue is not found in the stems of gymnosperms. Thus, this option is incorrect.
- **D) All of the above**: Since only gymnosperm leaves contain transfusion tissue, this option is also incorrect.

5. **Conclusion**: The correct answer is option B, gymnosperm leaf, as transfusion tissue is specifically found around the vascular bundles in the leaves of gymnosperms.

**Final Answer**: B) Gymnosperm leaf

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