How many of the following statements are not correct?
[I] In a flowering plant the substances that would need to be transported are water, mineral nutrients, organic nutrients and plant growth regulators.
[II] Over small distances, substances move by diffusion and by cytoplasmic streaming supplemented only by passive transport.
[III] Organic and mineral nutrients undergo multidirectional transport through the xylem.
[IV] From the storage organs, organic compounds are later re-exported.
[V] Phytohormones and other chemical signals are transported to maintain and regulate the plant functions.

Options

A. Two
B. Three
C. Four
D. Five

Answer

To determine how many of the given statements are not correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I**: "In a flowering plant the substances that would need to be transported are water, mineral nutrients, organic nutrients and plant growth regulators."
- **Analysis**: This statement is correct. Water, mineral nutrients, organic nutrients, and plant growth regulators (phytohormones) are indeed substances that need to be transported in flowering plants.

2. **Statement II**: "Over small distances, substances move by diffusion and by cytoplasmic streaming supplemented only by passive transport."
- **Analysis**: This statement is incorrect. While diffusion and cytoplasmic streaming do occur over small distances, they are supplemented by active transport mechanisms (which require energy), not just passive transport.

3. **Statement III**: "Organic and mineral nutrients undergo multidirectional transport through the xylem."
- **Analysis**: This statement is also incorrect. In xylem, the transport of water and mineral nutrients is unidirectional (from roots to other parts of the plant). Organic nutrients are transported through phloem, which allows for multidirectional transport.

4. **Statement IV**: "From the storage organs, organic compounds are later re-exported."
- **Analysis**: This statement is correct. Organic compounds stored in various parts of the plant can be re-exported to areas where they are needed, especially during growth or senescence.

5. **Statement V**: "Phytohormones and other chemical signals are transported to maintain and regulate the plant functions."
- **Analysis**: This statement is correct. Phytohormones and chemical signals are indeed transported throughout the plant to regulate various functions.

### Summary of Findings:
- **Correct Statements**: I, IV, V
- **Incorrect Statements**: II, III

### Conclusion:
The number of incorrect statements is **2** (specifically, statements II and III).

### Final Answer:
**2**