The inner wall of each guard cell, towards the pore or stomatal aperture, is

Options

A. thick and elastic
B. thin and elastic
C. thin and inelastic
D. thin and inelastic

Answer

To answer the question regarding the inner wall of each guard cell towards the pore or stomatal aperture, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Guard Cells**:
- Guard cells are specialized cells that surround the stomatal pore. They play a crucial role in regulating the opening and closing of stomata, which are essential for gas exchange and transpiration in plants.

2. **Identify the Function of Guard Cells**:
- The primary function of guard cells is to control the size of the stomatal aperture. When guard cells take up water and become turgid, they swell and cause the stomatal pore to open. Conversely, when they lose water and become flaccid, the pore closes.

3. **Examine the Characteristics of the Inner Wall**:
- The inner wall of the guard cells, which faces the stomatal aperture, is crucial for its function. This wall must be able to withstand the pressure changes that occur during the opening and closing of the stomata.

4. **Determine the Nature of the Inner Wall**:
- The inner wall of the guard cells is described as being **thick and elastic**. This thickness provides structural support, while elasticity allows for the necessary changes in shape as the guard cells swell or shrink.

5. **Evaluate the Options Provided**:
- The options given in the question are:
- a) Thick and elastic
- b) Thin and elastic
- c) Thin and inelastic
- d) Thick and inelastic
- Based on our understanding, the correct answer is **thick and elastic**.

### Final Answer:
The inner wall of each guard cell, towards the pore or stomatal aperture, is **thick and elastic**.

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