Bulliform cells in Grass leaves show

Options

A. Growth movements
B. Tropic movement
C. Nastic movements
D. Turgor movements.

Answer

**Step-by-Step Solution:**

1. **Understanding Bulliform Cells:**
- Bulliform cells are specialized large epidermal cells found on the upper surface (adaxial surface) of grass leaves. Their primary function is related to the plant's response to water availability.

2. **Identifying the Function of Bulliform Cells:**
- These cells play a crucial role in the rolling and unrolling of grass leaves. This process is essential for reducing water loss during dry conditions.

3. **Mechanism of Action:**
- The rolling and unrolling of leaves by bulliform cells is governed by changes in turgor pressure. Turgor pressure is the pressure exerted by the fluid inside the vacuoles of plant cells against the cell wall.

4. **Defining Turgor Movements:**
- Turgor movements occur when there is a change in turgor pressure within the cells. In the case of bulliform cells, when the plant is well-watered, these cells become turgid, causing the leaves to unroll. Conversely, when water is scarce, the cells lose turgor pressure, leading to the rolling of leaves to minimize water loss.

5. **Differentiating Other Types of Movements:**
- **Growth Movements:** These are movements that occur due to growth in response to stimuli (e.g., phototropism).
- **Tropic Movements:** These involve directional growth in response to environmental stimuli, such as light (phototropism) or gravity (gravitropism).
- **Nastic Movements:** These are non-directional movements in response to stimuli, such as the opening and closing of flowers.

6. **Conclusion:**
- Based on the function and mechanism of bulliform cells, the correct answer to the question is that they show **turgor movements**.