In Rhizopus and Spirogyra meiosis occurs at the time of

Options

A. Zoospore formation
B. Gamete formation'
C. Akinete formation
D. Germination of Zygospore

Answer

**Step-by-Step Solution:**

1. **Understanding the Organisms**: Begin by identifying the two organisms in question: Rhizopus and Spirogyra. Both are fungi and algae, respectively, and they have distinct reproductive processes.

2. **Identifying the Life Cycle**: Recognize that both organisms have a life cycle that includes both haploid (gametophytic) and diploid (sporophytic) stages. In Rhizopus, the haploid phase produces gametes, while in Spirogyra, it produces zoogametes.

3. **Meiosis in the Life Cycle**: Understand that meiosis is a type of cell division that reduces the chromosome number by half, leading to the formation of gametes or spores. In these organisms, meiosis occurs after fertilization when the diploid zygospore is formed.

4. **Timing of Meiosis**: In Rhizopus and Spirogyra, meiosis occurs during the germination of the zygospore. This is when the diploid zygospore undergoes meiosis to produce haploid spores or gametes.

5. **Evaluating Options**:
- Option 1: Zoospore formation - Incorrect, as this does not directly relate to meiosis.
- Option 2: Gamete formation - Incorrect, as gametes are formed before the zygospore stage.
- Option 3: Akinate formation - Incorrect, as this does not pertain to the process of meiosis in these organisms.
- Option 4: Germination of zygospore - Correct, as this is when meiosis occurs.

6. **Conclusion**: Therefore, the correct answer is that meiosis occurs at the time of the germination of the zygospore.

**Final Answer**: Meiosis occurs at the time of the germination of the zygospore in Rhizopus and Spirogyra.

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