Auxin inhibits the growth of

Options

A. apical buds
B. lateral axillary buds
C. roots on stem cutting
D. Parthenocarpic development of fruits

Answer

To solve the question "Auxin inhibits the growth of what?", we will analyze each option provided in the context of the role of auxin in plant growth.

### Step-by-Step Solution:

1. **Understanding Auxin**:
- Auxin is a plant hormone that plays a crucial role in regulating growth and development. It is primarily found in the stem, root tips, and buds.

**Hint**: Remember that auxin is involved in promoting growth in certain parts of the plant.

2. **Function of Auxin**:
- Auxin promotes stem elongation and the growth of apical buds. It is also responsible for apical dominance, which is the phenomenon where the main central stem of the plant grows more strongly than the side stems.

**Hint**: Apical dominance means that the main stem grows more than the lateral branches.

3. **Inhibition by Auxin**:
- While auxin promotes growth in certain areas, it inhibits the growth of lateral buds. This means that when auxin levels are high, the formation of lateral buds is suppressed.

**Hint**: Think about how the presence of auxin affects the growth of side branches compared to the main stem.

4. **Analyzing the Options**:
- **Option 1: Apical buds** - Incorrect. Auxin promotes the growth of apical buds.
- **Option 2: Lateral auxiliary buds** - Correct. Auxin inhibits the growth of lateral buds.
- **Option 3: Roots on stem cutting** - Incorrect. Auxin promotes root growth.
- **Option 4: Parthenocarpic development of fruits** - Incorrect. Auxin promotes parthenocarpic fruit development.

5. **Conclusion**:
- The only correct answer is that auxin inhibits the growth of **lateral auxiliary buds**.

### Final Answer:
Auxin inhibits the growth of **lateral auxiliary buds**.