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 determine which statement about the life cycle of Volvox is incorrect, we need to analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Volvox**:
- Volvox is a colonial green algae that exhibits movement. It is known for its unique structure and life cycle.

2. **Analyzing the Sporophytic Generation**:
- The first statement claims that the sporophytic generation is represented only by a two-celled zygote.
- This is correct because in Volvox, the sporophyte is indeed represented by the zygote, which is typically two-celled.

3. **Meiosis in Zygote**:
- The second statement mentions that meiosis in the zygote results in the formation of haploid spores.
- This is also correct, as the zygote undergoes meiosis to produce haploid spores.

4. **Free-living Sporophytes**:
- The third statement states that all sporophytes are free-living.
- This is correct as well, since the sporophytes in Volvox are indeed free-living and can form colonies.

5. **Dominant Photosynthetic Phase**:
- The fourth statement claims that the dominant photosynthetic phase is the free-living sporophyte.
- This is incorrect because in Volvox, the dominant phase of the life cycle is the gametophyte, not the sporophyte.

### Conclusion:
The incorrect statement about the life cycle in Volvox is that the dominant photosynthetic phase is the free-living sporophyte. The dominant phase is actually the gametophyte.

### Final Answer:
The correct option indicating the incorrect statement is the fourth option.

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