lenticels do not occur on

Options

A. fruit
B. Root
C. stem
D. leaf

Answer

### Step-by-Step Solution:

1. **Understand the Term "Lenticels":**
- Lenticels are specialized structures in plants that allow for gas exchange. They are formed by a porous tissue that contains large intercellular spaces.

2. **Identify Where Lenticels Are Found:**
- Lenticels are primarily found in the bark of woody stems. They are also present in the roots of dicotyledonous plants. Their presence in these areas facilitates gas exchange, especially since the bark is typically impermeable to gases.

3. **Evaluate the Options:**
- The options given are fruit, root, stem, and leaf.
- Since we know that lenticels are present in the bark of woody stems and in the roots of dicot plants, we can eliminate these two options.

4. **Analyze the Remaining Options:**
- The remaining options are fruit and leaf.
- Lenticels are not typically associated with leaves, as leaves have other structures (like stomata) for gas exchange.

5. **Conclude the Answer:**
- Based on the analysis, lenticels do not occur on leaves. Therefore, the correct answer is **leaf (option D)**.