Cells of which tissue are usually dead and without protoplasts :-

Options

A. Parenchyma
B. Parenchyma
C. Sclerenchyma
D. Phloem

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question:**
The question asks about a type of tissue in plants where the cells are usually dead and lack protoplasts.

2. **Identifying Plant Tissues:**
The main types of plant tissues include:
- Parenchyma
- Collenchyma
- Sclerenchyma
- Xylem
- Phloem

3. **Analyzing Each Tissue Type:**
- **Parenchyma:** These cells are typically alive and contain protoplasts.
- **Collenchyma:** These cells are also alive and have protoplasts, providing flexible support.
- **Sclerenchyma:** This tissue is known for having dead cells and is primarily composed of thickened cell walls. The cells in sclerenchyma are usually dead at maturity and lack protoplasts.
- **Xylem:** Xylem vessels and tracheids are also dead at maturity and lack protoplasts, but they are specifically involved in water transport.
- **Phloem:** Phloem cells, such as sieve tubes and companion cells, are alive and contain protoplasts.

4. **Conclusion:**
Based on the analysis, the tissue that consists of dead cells without protoplasts is **Sclerenchyma**. However, it is important to note that the question might also refer to xylem, which is another tissue type that has dead cells without protoplasts.

5. **Final Answer:**
The correct answer is **Sclerenchyma** (Option 3).

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