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 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, let's analyze each of the provided options step-by-step.

### Step 1: Understand the Concept of Metagenesis
Metagenesis refers to the alternation of generations in the life cycle of certain organisms, where there is a switch between asexual and sexual reproduction. This is commonly observed in organisms like Obelia, a type of colonial hydrozoan.

**Hint:** Remember that metagenesis involves both asexual and sexual phases.

### Step 2: Analyze Each Statement
1. **Statement 1:** "Alteration of the asexual and the sexual phases in the life cycle of Obelia is called metagenesis."
- This statement is **correct**. Metagenesis indeed involves the alternation between asexual (polyp) and sexual (medusa) phases in organisms like Obelia.

**Hint:** Identify the phases of Obelia's life cycle.

2. **Statement 2:** "Metagenesis is similar to the alteration of generation as found in plants."
- This statement is **incorrect**. While both concepts involve alternation of generations, metagenesis is specifically the alternation between asexual and sexual phases in certain animals, which is different from the plant life cycle that usually involves distinct gametophyte and sporophyte generations.

**Hint:** Compare metagenesis with plant life cycles to see the differences.

3. **Statement 3:** "Both Medusa and Polyp are diploid."
- This statement is **correct**. In the life cycle of Obelia, both the medusa (sexual phase) and polyp (asexual phase) are diploid.

**Hint:** Recall the ploidy levels of the different phases in Obelia's life cycle.

4. **Statement 4:** "Medusa is the sexual phase and polyp is the asexual phase."
- This statement is **correct**. In Obelia, the medusa represents the sexual phase, while the polyp represents the asexual phase.

**Hint:** Remember which phase corresponds to sexual and asexual reproduction.

### Conclusion
Based on the analysis, the **incorrect statement** about metagenesis is **Statement 2**: "Metagenesis is similar to the alteration of generation as found in plants."

**Final Answer:** Statement 2 is incorrect about metagenesis.