Annulus occurs in

Options

A. Annual plants
B. Mosses
C. Both mosses and ferns
D. Gymnosperms.

Answer

**Step-by-Step Solution:**

1. **Understanding the Term 'Annulus':**
- The annulus is a specialized layer of cells that is found in certain plants. It is crucial for the process of spore dispersal.

2. **Location of Annulus:**
- The annulus is located at the outer rim of the sporangium, which is the structure where spores are produced.

3. **Types of Plants with Annulus:**
- The annulus is present in plants that reproduce by spores, specifically in bryophytes (like mosses) and pteridophytes (like ferns).

4. **Function of Annulus:**
- The primary function of the annulus is to facilitate the dispersal of spores. This is essential for the formation of new sporophytes, which are the next generation of plants.

5. **Exclusion of Other Options:**
- Annual plants and gymnosperms do not have an annulus because they reproduce by seeds, not spores. Therefore, they are not applicable in this context.

6. **Conclusion:**
- Since the annulus is found in both mosses (bryophytes) and ferns (pteridophytes), the correct answer to the question is "both mosses and ferns."

**Final Answer:**
- Annulus occurs in both mosses and ferns.

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