Question

Xylem translocates:

• A. Water only
• B. Water and mineral salts only
• C. Water, mineral salts and some organic nitrogen only
• D. Water, mineral salts, some organic nitrogen and hormones

Answer 1

The Correct Option is D

The question pertains to the role of xylem in plant physiology, particularly in the transportation process. Xylem is a type of vascular tissue in plants that is primarily responsible for the conduction of water and dissolved minerals from the roots to various parts of the plant.

1. Understanding the function of xylem: The main function of xylem is to transport water from the roots to the leaves and other parts of the plant. However, its role is not limited to water transport alone.
2. Components transported by xylem:
   • Water: Xylem conducts water which is absorbed by the roots from the soil.
   • Mineral salts: Along with water, xylem also transports dissolved mineral salts from the soil, which are essential for plant growth.
   • Organic nitrogen: Some forms of organic nitrogen are also known to be translocated through xylem.
   • Hormones: Plant hormones like cytokines are synthesized in roots and then transported to various parts through the xylem.
3. Conclusion: Considering these components, the xylem translocates water, mineral salts, some organic nitrogen, and hormones. Thus, the correct answer is "Water, mineral salts, some organic nitrogen, and hormones."

This comprehensive function of xylem highlights its critical role in plant nourishment and metabolism, beyond simple water transport.