Which is correct about transport or conduction of substances

Options

A. Organic food moves up through phloem
B. Organic food moves up through xylem
C. Inorganic food moves upwardly and downwardly through xylem
D. Organic food moves upwardly upwardly and downwardly through phloem

Explanation

To determine the correct statement about the transport or conduction of substances in plants, we need to analyze the functions of the two main types of vascular tissue: xylem and phloem.

### Step-by-Step Solution:

1. **Understand the Functions of Xylem and Phloem**:
- Xylem is responsible for transporting water and minerals from the roots to the aerial parts of the plant.
- Phloem is responsible for transporting organic food, primarily sugars, produced during photosynthesis.

2. **Identify the Direction of Transport**:
- The transport of water and minerals through xylem occurs in an upward direction due to a phenomenon known as transpiration pull.
- The transport of sugars through phloem, known as translocation, can occur both upward and downward depending on the plant's needs.

3. **Analyze the Options**:
- **Option 1**: "Organic food moves up through phloem." - This is partially correct because food moves both up and down through phloem.
- **Option 2**: "Organic food moves up through xylem." - This is incorrect; organic food is transported through phloem, not xylem.
- **Option 3**: "Inorganic food moves upwardly and downwardly through xylem." - This is incorrect; food is organic and moves through phloem.
- **Option 4**: "Organic food moves upwardly and downwardly through phloem." - This is correct as it accurately describes the function of phloem.

4. **Conclusion**:
- Based on the analysis, the correct statement about the transport of substances in plants is **Option 4**: "Organic food moves upwardly and downwardly through phloem."