Secondary growth commonly occurs in

Options

A. Gymnosperms and Angiosperms
B. Dicot plans and Monocot plants
C. Gymnosperms and Dicot plants
D. Pteridophytes and Monocot plants

Answer

**Step-by-Step Solution:**

1. **Understanding Secondary Growth**: Secondary growth refers to the increase in the girth or width of a plant. This growth is primarily due to the activity of the cambium, a type of meristematic tissue.

2. **Role of Cambium**: The cambium is a layer of tissue that produces new cells, contributing to the thickening of stems and roots. It is responsible for the formation of secondary xylem (wood) and secondary phloem.

3. **Occurrence in Plant Types**: Secondary growth is commonly found in certain types of plants. Specifically, it occurs in:
- **Dicotyledons (Dicots)**: These plants typically have a well-defined cambium layer, allowing for significant secondary growth.
- **Gymnosperms**: Like dicots, gymnosperms also possess cambium and can undergo secondary growth.

4. **Monocotyledons (Monocots)**: In contrast, monocots generally do not have a cambium layer and therefore do not undergo secondary growth. They primarily grow in height rather than width.

5. **Conclusion**: Based on the information about the presence of cambium and its role in secondary growth, we conclude that secondary growth commonly occurs in dicots and gymnosperms.

**Final Answer**: Secondary growth commonly occurs in **dicots and gymnosperms**.

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