Which of the following statement are not true
(a) In CAM plant,stomata open during dark and remain closed during day
(b) Role of `Na^(+)` in stomata opening is now universally accepted
(c) Water Potential of root cells is higher then water potential of soil
(d) Capillarity theory is most accepted theory theory of water movement through plants
(e) Wall of xylem vessels made up of lignocellulose has strong affinity for water molecules

Options

A. a , c and e
B. b, c and d
C. a, b and c
D. b and c

Answer

To determine which statements are not true regarding transport in plants, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (a)**: "In CAM plants, stomata open during the dark and remain closed during the day."
- **Analysis**: This statement is true. CAM (Crassulacean Acid Metabolism) plants open their stomata at night to minimize water loss and close them during the day to conserve moisture while performing photosynthesis.
- **Conclusion**: This statement is true.

2. **Statement (b)**: "Role of Na⁺ in stomata opening is now universally accepted."
- **Analysis**: This statement is false. While sodium ions (Na⁺) may play a role in some plant processes, their role in stomatal opening is not universally accepted as a primary factor.
- **Conclusion**: This statement is false.

3. **Statement (c)**: "Water potential of root cells is higher than water potential of soil."
- **Analysis**: This statement is also false. Typically, the water potential of root cells is lower than that of the surrounding soil, allowing water to move into the roots.
- **Conclusion**: This statement is false.

4. **Statement (d)**: "Capillarity theory is the most accepted theory of water movement through plants."
- **Analysis**: This statement is false. While capillarity contributes to water movement, the cohesion-tension theory is more widely accepted as the primary mechanism for water transport in plants.
- **Conclusion**: This statement is false.

5. **Statement (e)**: "Wall of xylem vessels made up of lignocellulose has a strong affinity for water molecules."
- **Analysis**: This statement is true. The lignocellulosic structure of xylem walls does have a strong affinity for water, aiding in the transport of water through the plant.
- **Conclusion**: This statement is true.

### Summary of Findings:
- True Statements: (a) and (e)
- False Statements: (b), (c), and (d)

### Final Answer:
The statements that are not true are **(b), (c), and (d)**.

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