The cells without nuclei are present in
(a) Vascular cambium
(b) Root hair
(c) Companion cell
(d) Members of sieve tube

Options

A. Vascular cambium
B. Root hair
C. Companion cell
D. Members of sieve tube

Answer

To determine which cells are without nuclei, let's analyze each option provided in the question:

1. **Vascular Cambium (Option A)**:
- Vascular cambium is a type of meristematic tissue that is responsible for the production of secondary xylem and phloem. These cells are actively dividing and contain nuclei. Therefore, vascular cambium cells are nucleated.

2. **Root Hair (Option B)**:
- Root hairs are extensions of root epidermal cells that help in the absorption of water and nutrients. These cells are also nucleated as they are part of the root system and perform vital functions. Thus, root hairs contain nuclei.

3. **Companion Cell (Option C)**:
- Companion cells are specialized parenchyma cells found in the phloem. They are closely associated with sieve tube elements and have nuclei. Their primary role is to assist in the functioning of sieve tube elements. Therefore, companion cells are nucleated.

4. **Members of Sieve Tube (Option D)**:
- Sieve tube elements are part of the phloem and are responsible for the transport of nutrients, particularly sugars. These cells are unique in that they lose their nuclei at maturity, allowing for more efficient transport of materials. Therefore, members of the sieve tube do not contain nuclei.

Based on the analysis above, the correct answer is:

**(d) Members of sieve tube**

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