Coenogametes occur in

Options

A. Penicillium
B. Rhizopus
C. Puccinia
D. Ustilago.

Answer

To solve the question "Coenogametes occur in," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Term "Coenogametes":**
- Coenogametes are multi-nucleated gametes that are formed in certain fungi. They are produced when two gametangia come into close contact and fuse.

2. **Identify the Options:**
- The options given are:
- A) Penicillium
- B) Rhizopus
- C) Buccinia
- D) Ustilago

3. **Analyze Each Option:**
- **Penicillium:** This genus primarily reproduces asexually and does not produce coenogametes.
- **Rhizopus:** This genus is known for producing coenogametes during sexual reproduction. The progametangium divides to form gametangia, which then fuse to form coenogametes.
- **Buccinia:** This genus is associated with rust fungi and does not typically form coenogametes.
- **Ustilago:** This genus is known for smut fungi, which also do not produce coenogametes.

4. **Conclusion:**
- Based on the analysis, the only option that produces coenogametes is **Rhizopus**. Therefore, the correct answer is **B) Rhizopus**.

### Final Answer:
Coenogametes occur in **Rhizopus**.

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