Turgor operated valves are

Options

A. Root hairs
B. Stomata
C. Tracheary elements
D. Collenchyma.

Answer

To answer the question "Turgor operated valves are," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Turgor Pressure**: Turgor pressure is the pressure exerted by the fluid (usually water) inside the central vacuole of plant cells against the cell wall. This pressure is crucial for maintaining the structure and rigidity of plant cells.

2. **Identify Turgor Movement**: Turgor movement refers to the reversible change in the position of a plant part due to changes in the turgidity (firmness) of cells. This movement is primarily caused by changes in the internal water pressure of the cells.

3. **Examine the Options**: The options provided are root hairs, stomata, prachiri elements, and collenchyma. We need to identify which of these structures are associated with turgor-operated valves.

4. **Focus on Stomata**: Stomata are small openings on the surfaces of leaves and stems that allow for gas exchange. The opening and closing of stomata are controlled by guard cells, which are specialized cells that respond to changes in turgor pressure.

5. **Guard Cells Function**: When guard cells take up water, they become turgid (swollen), causing the stomatal pores to open. Conversely, when guard cells lose water and become flaccid, the stomatal pores close. This mechanism is a classic example of turgor-operated valves.

6. **Conclusion**: Based on the understanding of turgor pressure and the function of guard cells, we conclude that the correct answer to the question is **stomata**.

### Final Answer:
Turgor operated valves are **stomata**.

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