Tyloses thickenings are seen in

Options

A. Ray parenchyma
B. Collenchyma
C. Phloem cells
D. Ray parenchyma and xylem cells

Answer

**Step-by-Step Solution:**

1. **Understanding Tyloses**: Tyloses are bladder-like structures that form in certain plant tissues during secondary growth. They are outgrowths that can block the vessels in the xylem.

2. **Identifying the Context**: Tyloses are primarily associated with the xylem, which is responsible for water conduction in plants. They can also be found in ray parenchyma, which is a type of parenchyma tissue that is involved in storage and transport.

3. **Analyzing the Options**:
- **Option 1: Parenchyma** - While tyloses can be associated with parenchyma, this option is too broad as it does not specify ray parenchyma.
- **Option 2: Collenchyma** - This type of tissue provides support and does not contain tyloses.
- **Option 3: Phloem Cells** - Phloem is responsible for the transport of nutrients, and it does not have tyloses.
- **Option 4: Ray Parenchyma and Xylem Cells** - This option correctly identifies the tissues where tyloses are found.

4. **Conclusion**: The correct answer is that tyloses thickenings are seen in ray parenchyma and xylem cells.

**Final Answer**: Tyloses thickenings are seen in ray parenchyma and xylem cells.

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