What is stomatal apparatus? Explain the structure of stomata with a labelled diagram.

Explanation

### Step-by-Step Solution

**Step 1: Define Stomatal Apparatus**
The stomatal apparatus refers to the structure that facilitates gas exchange in plants. It primarily consists of a pair of guard cells which may or may not be surrounded by subsidiary cells.

**Step 2: Identify the Main Components of Stomata**
The stomatal apparatus comprises three main parts:
1. **Stoma (Stomatal Aperture)**: This is the small opening present in the epidermal cells of leaves, allowing for gas exchange.
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