Identify which of the given statements are correct .

Options

A. Mineral nutrients have multi-directional flow through xylem in plants .
B. Transport in xylem is from stem to roots .
C. Mineral nutrients are transported upwards from root to different parts of plant .
D. Nutrients are exported from photosynthetic leaves to all parts of plant .

Answer

To solve the question of identifying which statements are correct regarding the transport of nutrients in plants, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding the Role of Xylem and Phloem**:
- Xylem is responsible for the transport of water and mineral nutrients from the roots to the rest of the plant. This movement is unidirectional, meaning it only flows in one direction—from the roots to the shoots.
- Phloem, on the other hand, transports organic compounds (primarily sugars produced during photosynthesis) and can move these compounds in multiple directions throughout the plant.

2. **Analyzing Statement 1**:
- **Statement 1**: "Mineral nutrients have multidirectional flow through xylem in plants."
- This statement is **false** because xylem transport is unidirectional (from roots to shoots).

3. **Analyzing Statement 2**:
- **Statement 2**: "Transport in xylem is from stem to root."
- This statement is also **false**. As mentioned earlier, xylem transports nutrients from roots to shoots, not the other way around.

4. **Analyzing Statement 3**:
- **Statement 3**: "Mineral nutrients are transported upward from root to different parts of the plant."
- This statement is **true**. It accurately describes the function of xylem in transporting mineral nutrients from the roots upward to various parts of the plant.

5. **Analyzing Statement 4**:
- **Statement 4**: "Nutrients are exported from photosynthetic leaves to all parts of the plant."
- This statement is **false** because it is not the nutrients that are exported from leaves; rather, it is the organic products (like sugars) that are transported through phloem.

### Conclusion:
After analyzing all the statements, we find that only **Statement 3** is correct.

### Final Answer:
The correct statement is: **Statement 3** - "Mineral nutrients are transported upward from root to different parts of the plant."

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