Plants showing anomalous secondary growth include

Options

A. Agave
B. Dracaena
C. Yucca
D. all of these

Explanation

To answer the question "Plants showing anomalous secondary growth include," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Secondary Growth**:
- Secondary growth refers to the increase in the girth of the plant, which occurs due to the activity of the cambium. This process is typical in dicotyledonous plants.

2. **Differentiate Between Dicot and Monocot Growth**:
- In dicots, secondary growth is normal and occurs due to the presence of vascular cambium, which produces secondary xylem (wood) and secondary phloem.
- In monocots, however, cambium is absent. Therefore, any secondary growth that occurs is considered "anomalous" or abnormal.

3. **Identify the Mechanism of Anomalous Secondary Growth in Monocots**:
- In monocots, secondary growth occurs due to the de-differentiation of parenchyma cells in the cortex and pericycle into meristematic tissue. This leads to the formation of additional vascular tissues.

4. **Examples of Plants with Anomalous Secondary Growth**:
- Some plants that exhibit anomalous secondary growth include:
- **Dracaena**
- **Yucca**
- **Egeva**
- These plants demonstrate secondary growth despite being monocots, which is why their growth is termed anomalous.

5. **Conclusion**:
- Therefore, the answer to the question is that plants showing anomalous secondary growth include Dracaena, Yucca, and Egeva.

### Final Answer:
Plants showing anomalous secondary growth include Dracaena, Yucca, and Egeva.

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