Select an incorrect statement for plant life cycle and alteration of generations

Options

A. Haplontic life cycle is found in Volvox Fucus and Spirogyra
B. Diplontic life cycle is found in gymnosperms and angiosperms
C. Most algal genera are haplontic
D. Haploid spores divide by mitosis to form a haploid plant body

Answer

To solve the question regarding the incorrect statement about plant life cycles and alternation of generations, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Alternation of Generations**:
- The alternation of generations is a biological phenomenon where plants alternate between two distinct forms: the haploid gametophyte and the diploid sporophyte.

2. **Identify the Types of Life Cycles**:
- There are three main types of life cycles in plants:
- **Haplontic Life Cycle**: Dominated by the haploid stage. Example: Volvox, Spirogyra.
- **Diplontic Life Cycle**: Dominated by the diploid stage. Example: Gymnosperms and Angiosperms.
- **Haplodiplontic Life Cycle**: A mix of both haploid and diploid stages.

3. **Analyze the Given Statements**:
- **Statement 1**: Haplontic life cycle is found in Volvox, Fucus, and Spirogyra.
- **Analysis**: This statement is incorrect because Fucus is a brown algae that exhibits a Diplontic life cycle, not Haplontic.
- **Statement 2**: Diplontic life cycle is found in Gymnosperms and Angiosperms.
- **Analysis**: This statement is correct as both Gymnosperms and Angiosperms have a Diplontic life cycle.
- **Statement 3**: Most algal genera are haplontic.
- **Analysis**: This statement is also correct as many algae, including Volvox and Spirogyra, follow a haplontic life cycle.
- **Statement 4**: Haploid spores divide by mitosis to form a haploid plant body.
- **Analysis**: This statement is correct as haploid spores undergo mitosis to develop into the gametophyte.

4. **Conclusion**:
- The incorrect statement among the options provided is **Statement 1**: "Haplontic life cycle is found in Volvox, Fucus, and Spirogyra."

### Final Answer:
The incorrect statement is: **Haplontic life cycle is found in Volvox, Fucus, and Spirogyra.**

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