Select an incorrect statement

Options

A. Root pressure has never been observed in confiners
B. Root pressure cannot be inhibited by using cyanide , lack of `O_(2)` and low temperature
C. Root pressure can re-establish the continuous chain of water molecules in the xylem
D. Develops during early morning and night

Answer

To solve the question "Select an incorrect statement," we will analyze the provided statements one by one to identify which one is incorrect.

### Step-by-Step Solution:

1. **Identify the Statements:**
We have four statements regarding root pressure and its characteristics. We need to evaluate each statement to determine its correctness.

2. **Evaluate Statement 1:**
- **Statement:** "The root pressure has never been observed in conifers."
- **Analysis:** This statement is correct. Root pressure is indeed not observed in conifers, as they primarily rely on other mechanisms for water transport.

3. **Evaluate Statement 2:**
- **Statement:** "The root pressure cannot be inhibited by using cyanide, lack of O2, and low temperature."
- **Analysis:** This statement is incorrect. Cyanide is a poison that inhibits cytochrome oxidase, disrupting the electron transport chain and ATP synthesis. Without ATP, root pressure cannot be generated. Similarly, low oxygen levels and low temperatures can also inhibit root pressure. Therefore, this statement is false.

4. **Evaluate Statement 3:**
- **Statement:** "Root pressure can reestablish the continuous chain of water molecules in the xylem."
- **Analysis:** This statement is correct. Root pressure helps in maintaining the continuous column of water in the xylem, facilitating water transport.

5. **Evaluate Statement 4:**
- **Statement:** "Root pressure develops during early morning and night."
- **Analysis:** This statement is also correct. Root pressure tends to be higher during the night and early morning due to lower transpiration rates.

6. **Conclusion:**
After evaluating all the statements, we find that the incorrect statement is **Statement 2**: "The root pressure cannot be inhibited by using cyanide, lack of O2, and low temperature."

### Final Answer:
The incorrect statement is **Option B**: "The root pressure cannot be inhibited by using cyanide, lack of O2, and low temperature."

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