Meiosis occurs in the zygotes of

Options

A. Bryophytes
B. Pteridophytes
C. Gymnosperms
D. Haploid algae

Answer

To answer the question "Meiosis occurs in the zygotes of which of the following: bryophytes, pteridophytes, gymnosperms, or haploid algae?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Meiosis**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the formation of gametes. In some organisms, this process occurs in the zygote stage.

2. **Identify the Types of Life Cycles**:
- **Haplontic Life Cycle**: In this cycle, the organism spends most of its life in the haploid stage. The zygote is the only diploid stage and undergoes meiosis to produce haploid spores.
- **Haplo-Diplontic Life Cycle**: This cycle includes both haploid and diploid stages, where the organism alternates between these two forms.
- **Diplontic Life Cycle**: In this cycle, the organism is predominantly diploid, and meiosis occurs in the formation of gametes.

3. **Analyzing Each Option**:
- **Bryophytes**: They exhibit a haplo-diplontic life cycle, where the dominant stage is haploid (gametophyte), and the zygote is diploid but does not undergo meiosis.
- **Pteridophytes**: Similar to bryophytes, they also have a haplo-diplontic life cycle, with the sporophyte being the dominant stage. The zygote does not undergo meiosis.
- **Gymnosperms**: They have a diplontic life cycle, where the dominant stage is diploid, and meiosis occurs in the formation of gametes, not in the zygote.
- **Haploid Algae**: These organisms have a haplontic life cycle, where the zygote is the only diploid stage and undergoes meiosis to produce haploid spores.

4. **Conclusion**: Based on the analysis, meiosis occurs in the zygote of haploid algae. Therefore, the correct answer is **haploid algae**.

### Final Answer:
Meiosis occurs in the zygotes of **haploid algae**.