In rooted plants, transport of organic and mineral nutrients is

Options

A. Sometime unidirectional
B. Multidirectional
C. Essentially unidirectional, from roots to the stems
D. Essentially unidirectional, from stems to the roots

Answer

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

1. **Understanding the Types of Transport in Plants:**
- In rooted plants, there are two main types of transport systems: one for water and one for organic and mineral nutrients.
- Water is primarily transported through the xylem, while organic nutrients (like sugars) and minerals are transported through the phloem.

2. **Direction of Transport:**
- The transport of water from the roots to the stem is unidirectional, meaning it occurs in one direction only (from roots to stem).
- In contrast, the transport of organic nutrients and minerals through the phloem is multidirectional, meaning it can occur in multiple directions (upward, downward, and laterally).

3. **Analyzing the Options:**
- **Option 1:** "Sometimes unidirectional." This is incorrect because the transport of organic and mineral nutrients is always multidirectional.
- **Option 2:** "Multidirectional." This is correct as it accurately describes the transport of organic and mineral nutrients in plants.
- **Option 3:** "Essentially unidirectional from roots to stem." This is incorrect because nutrients are not transported this way; they are transported in multiple directions.
- **Option 4:** "Essentially unidirectional from stem to roots." This is also incorrect for the same reason as option 3.

4. **Conclusion:**
- After analyzing all the options, option 2 is the only correct answer. The transport of organic and mineral nutrients in rooted plants is multidirectional.