Which of the following is a living component of xylem?

Options

A. Xylem fibres
B. Tracheids
C. Vessels
D. Xylem parenchyma

Answer

**Step-by-Step Solution:**

1. **Identify the Components of Xylem:**
Xylem is composed of four main components: xylem fibers, tracheids, vessels, and xylem parenchyma.

2. **Analyze Each Component:**
- **Xylem Fibers:** These are made up of sclerenchyma tissue, which consists of dead cells. They lose their protoplast at maturity and are characterized by lignin in their cell walls.
- **Tracheids:** These are elongated cells that also lack protoplasm and are dead at maturity. They have lignified walls, making them unsuitable as living components.
- **Vessels:** Similar to tracheids, vessels are water-conducting elements that are also dead and lack protoplasm. They have lignified walls as well.
- **Xylem Parenchyma:** This component consists of thin-walled cells that are living. They contain protoplasm and a nucleus, and their cell walls are made of cellulose. They are involved in the storage of food such as starch, fats, and proteins.

3. **Determine the Living Component:**
Among the four components, xylem parenchyma is the only living component of xylem, as it retains its protoplast and nucleus.

4. **Conclusion:**
Therefore, the correct answer to the question "Which of the following is a living component of xylem?" is **xylem parenchyma**.

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