Microsporangia of Cycas occur over microsporophyll

Options

A. abaxial
B. adaxial
C. lateral
D. margin.

Answer

**Step-by-Step Solution:**

1. **Understanding Microsporangia and Microsporophyll:**
- Microsporangia are structures that produce microspores, which develop into male gametophytes (pollen grains) in seed plants.
- Microsporophylls are leaf-like structures that bear microsporangia.

2. **Identifying the Location of Microsporangia in Cycas:**
- In Cycas, the microsporangia are found on the microsporophylls.
- The question asks where these microsporangia are located on the microsporophylls.

3. **Defining Abaxial Surface:**
- The term "abaxial" refers to the surface that is facing away from the stem of the plant.
- It is also known as the lower surface of the leaf.

4. **Reason for Abaxial Location:**
- The microsporangia of Cycas are located abaxially because the terminal portion of the microsporophyll is sterile.
- This positioning allows for optimal exposure and development of the microsporangia.

5. **Evaluating the Options:**
- The options provided are:
1. Abaxial
2. Adaxial
3. Lateral
4. Marginal
- Based on our understanding, the correct answer is "abaxial."

6. **Conclusion:**
- Therefore, the microsporangia of Cycas occur over the microsporophyll abaxially.

**Final Answer:**
The microsporangia of Cycas occur over the microsporophyll abaxially.

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