Which one is responsible for radial conduction of water and food in woody stems?
(a) vessels
(b) vascular rays
(c) endodermis
(d) xylem fibres

Options

A. vessels
B. vascular rays
C. endodermis
D. xylem fibres.

Answer

To determine which structure is responsible for radial conduction of water and food in woody stems, we can analyze each option provided:

1. **Understanding the question**: The question asks for the structure responsible for the radial conduction of water and food in woody stems.

2. **Analyzing the options**:
- **(a) Vessels**: Vessels are primarily responsible for the vertical conduction of water in plants. They do not play a significant role in radial conduction, so this option can be excluded.
- **(b) Vascular rays**: Vascular rays are a horizontal system of secondary tissues that extend radially across the stem. They are involved in the translocation of nutrients and water and are crucial for storage. This option seems promising.
- **(c) Endodermis**: The endodermis is a layer of cells that regulates the flow of water and nutrients into the vascular system but is not directly involved in the radial conduction of water and food in woody stems. Therefore, this option can also be excluded.
- **(d) Xylem fibres**: Xylem fibres provide structural support and do not participate in the conduction of water or food. Hence, this option can be excluded as well.

3. **Conclusion**: After analyzing all options, the only structure that is responsible for radial conduction of water and food in woody stems is **(b) vascular rays**. Vascular rays consist of parenchymatous cells that extend from the cambium into the xylem and phloem, facilitating the radial movement of fluids.

**Final Answer**: (b) vascular rays

---