Epidermis is the surface covering of a plant body. Which of the following functions is not performed by the epidermis?

Options

A. Protecting the plant from mechanical injury
B. Protecting the plant from invasion by pathogens
C. Preventing the loss of water from the plant, along with the cuticle
D. Preventing the exchange of gases between the plant and environment

Answer

To determine which function is not performed by the epidermis, we need to analyze the functions typically associated with the epidermis in plants. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Role of the Epidermis
The epidermis is the outermost layer of cells in a plant. Its primary functions include protection against mechanical injury, pathogens, and water loss.

### Step 2: Evaluate Each Option
1. **Protecting the plant from mechanical injuries**: This is a function of the epidermis, as it provides a protective barrier.

2. **Protecting the plant from invasion by pathogens**: The epidermis also serves this function by acting as a first line of defense against pathogens.

3. **Preventing the loss of water from the plant along with the cuticle**: The epidermis, along with the cuticle, helps to minimize water loss, making this function correct.

4. **Preventing the exchange of gases between the plant and the environment**: This statement is incorrect. The epidermis does not prevent gas exchange; in fact, it facilitates it through structures called stomata.

### Step 3: Identify the Incorrect Function
From the evaluation, option 4 is the function that is not performed by the epidermis. The epidermis allows for gas exchange rather than preventing it.

### Conclusion
The function that is not performed by the epidermis is **preventing the exchange of gases between the plant and the environment** (Option 4).

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