Which of the following statements is incorrect about metagenesis ?

Options

A. Alternation of asexual and sexual phases in the life cycle of Obelia is called metagenesis
B. Metagenesis is similar to alternation of generations as found in plants
C. Both the medusa and polyp are diploid
D. Medusa is the sexual phase and polyp is the asexual phase

Answer

To determine which statement is incorrect about metagenesis, we need to analyze the provided options based on our understanding of metagenesis and its characteristics.

### Step-by-Step Solution:

1. **Understanding Metagenesis**:
- Metagenesis refers to the alternation of generations in which both sexual and asexual reproduction occur. It is commonly observed in certain animal groups, particularly in the phylum Cnidaria.

2. **Analyzing the Options**:
- **Option 1**: "The alteration of asexual and sexual feeds in the life cycle of Obelia is called metagenesis."
- This statement is correct. Obelia, a member of the Cnidaria phylum, demonstrates metagenesis through its life cycle, which includes both asexual (polyp) and sexual (medusa) phases.

- **Option 2**: "Metagenesis is similar to alteration of generation as found in plants."
- This statement is incorrect. While both metagenesis and plant alternation of generations involve different forms of reproduction, they are fundamentally different. In plants, the alternation involves a sporophytic generation (diploid) and a gametophytic generation (haploid), which is not the same as the metagenesis seen in animals.

- **Option 3**: "Both the Medusa and Polyp are diploid."
- This statement is correct. In the life cycle of Obelia, both the medusa and polyp forms are diploid.

- **Option 4**: "Medusa is the asexual phase and Polyp is the sexual phase."
- This statement is incorrect. The polyp is the asexual phase, while the medusa is the sexual phase. Therefore, this option is also misleading.

3. **Identifying the Incorrect Statement**:
- The second option is incorrect because it misrepresents the nature of metagenesis in comparison to plant alternation of generations. Additionally, the fourth option contains a mischaracterization of the phases.

### Conclusion:
The incorrect statement about metagenesis is **Option 2**: "Metagenesis is similar to alteration of generation as found in plants."