Which statement is not true about water uptake in a plant roots

Options

A. A) Water enters the root by osmosis from the soil
B. B) Water enters the cytoplasm of the root hairs by active transport
C. C) Water travels by diffusion through the cell walls of the epidermis and cortex
D. D) Water must enter the cytoplasm of the encodermal cells to get pass the casparian strip

Answer

To determine which statement is not true about water uptake in plant roots, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Water Uptake Mechanism**:
- Water uptake in plant roots primarily occurs through osmosis, which is the movement of water from an area of higher water concentration (soil) to an area of lower water concentration (inside the root cells).

2. **Analyzing Option A**:
- **Statement**: Water enters the root by osmosis from the soil.
- **Evaluation**: This statement is true. Water does enter the roots through osmosis.

3. **Analyzing Option B**:
- **Statement**: Water enters the cytoplasm of the root hair by active transport.
- **Evaluation**: This statement is not true. Water does not enter root hair cells by active transport; it enters by osmosis. Active transport is used for the uptake of minerals, not water.

4. **Analyzing Option C**:
- **Statement**: Water travels by diffusion through the cell walls of the epidermis and cortex.
- **Evaluation**: This statement is true. Water can move through the spaces in the cell walls by diffusion.

5. **Analyzing Option D**:
- **Statement**: Water must enter the cytoplasm of the endodermal cells to get past the Casparian strip.
- **Evaluation**: This statement is true. The Casparian strip forces water to enter the cytoplasm of endodermal cells, which is necessary for the selective uptake of minerals.

6. **Conclusion**:
- After evaluating all options, we find that **Option B** is the statement that is not true about water uptake in plant roots.

### Final Answer:
**The statement that is not true about water uptake in plant roots is Option B: Water enters the cytoplasm of the root hair by active transport.**

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