The life cycle of moulds/ Rhizopus/ Mucor is

Options

A. isomorphic
B. haplontic
C. diplontic
D. heteromorphic

Answer

### Step-by-Step Solution:

1. **Understanding the Organisms**: The question refers to the life cycle of molds, specifically Rhizopus and Mucor. These are types of fungi that belong to the class of molds.

2. **Identifying the Life Cycle Stages**: In the life cycle of these molds, there are two main stages: the haploid stage and the diploid stage.

3. **Haploid Stage**: In Rhizopus and Mucor, the haploid stage is multicellular. This means that the organism exists in a form that has only one set of chromosomes and is made up of multiple cells.

4. **Diploid Stage**: The diploid stage, on the other hand, is limited to a unicellular zygote. This zygote is formed when two haploid cells fuse during sexual reproduction.

5. **Meiosis**: After the formation of the zygote, meiosis (reduction division) occurs, which reduces the diploid zygote back to haploid spores. This is a key characteristic of the haplontic life cycle.

6. **Evaluating the Options**: The options provided are:
- Isomorphic
- Haplontic
- Diplontic
- Heteromorphic

- **Isomorphic**: This option is incorrect because the life cycle of Rhizopus and Mucor does not have isomorphic generations.
- **Haplontic**: This is the correct option as explained earlier.
- **Diplontic**: This option is incorrect because the dominant stage is not diploid.
- **Heteromorphic**: This is also incorrect as the life cycle does not exhibit heteromorphic generations.

7. **Conclusion**: The correct answer is that the life cycle of molds like Rhizopus and Mucor is **haplontic**.

### Final Answer:
The life cycle of molds (Rhizopus/Mucor) is **haplontic**.

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