The water rises in staw due to suction , it is due to

Options

A. Positive hydrostatic pressure
B. Negative hydrostatic pressure
C. Zero hydrostatic pressure
D. Diffusion pressure

Answer

To solve the question "The water rises in straw due to suction, it is due to," we need to analyze the options provided and understand the concept of hydrostatic pressure in relation to water movement in plants and straws.

### Step-by-Step Solution:

1. **Understanding the Concept of Hydrostatic Pressure**:
- Hydrostatic pressure refers to the pressure exerted by a fluid at rest due to the force of gravity. It plays a crucial role in the movement of water within plants and other systems.

2. **Identifying the Type of Hydrostatic Pressure**:
- There are different types of hydrostatic pressure:
- **Positive Hydrostatic Pressure**: This occurs when the pressure is exerted in the direction of gravity, meaning the fluid is moving downwards.
- **Negative Hydrostatic Pressure**: This occurs when the fluid is moving against gravity, meaning it is being pulled upwards.
- **Zero Hydrostatic Pressure**: This occurs when there is no net pressure acting on the fluid, typically when forces are balanced.

3. **Analyzing the Situation of Water Rising in a Straw**:
- When you suck on a straw, you create a lower pressure inside the straw compared to the atmospheric pressure outside. This difference in pressure causes the water to rise up the straw.
- Since the water is moving upwards against the force of gravity, we can conclude that this movement is due to **negative hydrostatic pressure**.

4. **Eliminating Incorrect Options**:
- **Positive Hydrostatic Pressure**: Incorrect, as this refers to fluid moving downwards.
- **Zero Hydrostatic Pressure**: Incorrect, as there is a pressure difference causing the water to rise.
- **Diffusion Pressure**: Incorrect, as diffusion does not play a role in the suction mechanism of water in a straw.

5. **Conclusion**:
- The correct answer is **negative hydrostatic pressure**, as it describes the pressure exerted when water rises against gravity in the straw.

### Final Answer:
The water rises in the straw due to suction, it is due to **negative hydrostatic pressure**.

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