An example of monocots showing secondary growth in stem is

Options

A. sugarcane
B. Wheat
C. Maize
D. Yucca

Answer

**Step-by-Step Solution:**

1. **Understand the Concept of Secondary Growth**:
- Secondary growth refers to the increase in the thickness or circumference of plant organs, primarily stems and roots, due to the formation of secondary tissues. This growth is typically associated with dicotyledons (dicots) and gymnosperms.

2. **Identify the Characteristics of Monocots**:
- Monocots are a group of flowering plants that usually do not exhibit secondary growth because they lack a cambium layer, which is essential for the formation of secondary tissues.

3. **Review the Options Provided**:
- The options given are:
- A) Sugarcane
- B) Wheat
- C) Maize
- D) Yucca

4. **Analyze Each Option for Secondary Growth**:
- **Sugarcane**: A monocot that primarily exhibits primary growth with no significant secondary growth.
- **Wheat**: Another monocot that does not show secondary growth.
- **Maize**: Also a monocot, typically does not exhibit secondary growth.
- **Yucca**: A monocot known to exhibit secondary growth in its stems, despite the general rule that monocots do not show this growth.

5. **Conclude the Correct Answer**:
- Based on the analysis, the only option that represents a monocot capable of secondary growth is **D) Yucca**.

**Final Answer**: The example of monocots showing secondary growth in stem is **Yucca** (Option D).

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