Assertion :- Polyps produce medusae sexually and medusae form the polyps asexually.
Reason :- Polyps and medusae are the common feature of different group of cnidarians.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided, and determine their validity.

### Step 1: Analyze the Assertion
The assertion states: "Polyps produce medusae sexually and medusae form the polyps asexually."

- **Evaluation**: This statement is incorrect. Polyps reproduce asexually to produce medusae, not sexually. The typical process involves polyps undergoing budding or fission to create medusae.

### Step 2: Analyze the Reason
The reason states: "Polyps and medusae are the common feature of different groups of cnidarians."

- **Evaluation**: This statement is also incorrect. While polyps and medusae are indeed features of cnidarians, they are not merely common features of different groups but rather represent two different life stages of the same organism within the phylum Cnidaria.

### Step 3: Conclusion
Since both the assertion and the reason are incorrect, we can conclude that neither statement is true.

### Final Answer
Both the assertion and the reason are false.