Which of the following is incorrect about the life cycle in Volvox ?

Options

A. Sporophytic generation is represented only by the two - celled zygote .
B. Meiosis in the zygote results in the formation of haploid spores .
C. All the sporophytes are free - living
D. The dominant , photosynthetic phase is the free - living sporophyte.

Answer

To solve the question regarding the incorrect statement about the life cycle of Volvox, we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Understand the Life Cycle of Volvox**:
- Volvox is a type of colonial green algae that exhibits a life cycle characterized by both haploid and diploid phases.

2. **Analyze Each Statement**:
- **Statement A**: "Sporophytic generation is represented only by the two-celled zygote."
- **Analysis**: This statement is correct. In Volvox, the sporophytic generation is indeed represented by the zygote, which is typically two-celled.

- **Statement B**: "Meiosis in the zygote results in the formation of haploid spores."
- **Analysis**: This statement is also correct. The zygote undergoes meiosis to produce haploid spores, which will develop into the haploid phase of the life cycle.

- **Statement C**: "All these sporophytes are free-living."
- **Analysis**: This statement is correct as well. The sporophytic phase (the zygote) is free-living and can exist independently.

- **Statement D**: "Dominant photosynthetic phase is the free-living sporophyte."
- **Analysis**: This statement is incorrect. The dominant phase in the life cycle of Volvox is the haplontic phase, which is the free-living gametophyte, not the sporophyte.

3. **Conclusion**:
- The incorrect statement about the life cycle of Volvox is **Statement D**: "Dominant photosynthetic phase is the free-living sporophyte."

### Final Answer:
The incorrect statement about the life cycle in Volvox is **Statement D**.

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