Assertion : Cephalization is advatageous to an animal
Reason : It improves the appearance of the animal

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reson are false.

Explanation

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

### Step 1: Analyze the Assertion
- **Assertion**: "Cephalization is advantageous to an animal."
- **Explanation**: Cephalization refers to the concentration of nervous tissue and sensory organs at the anterior (front) end of an organism, forming a distinct head. This adaptation allows for better sensory perception and coordination, which can enhance an animal's ability to interact with its environment, find food, and avoid predators. Thus, the assertion is **true**.

### Step 2: Analyze the Reason
- **Reason**: "It improves the appearance of the animal."
- **Explanation**: While cephalization may change the physical structure of an animal, it does not primarily serve to improve its appearance. The main advantage of cephalization is functional, related to sensory and nervous system efficiency, rather than aesthetic. Therefore, the reason is **false**.

### Step 3: Conclusion
- Since the assertion is true and the reason is false, we can conclude that the correct relationship is that the assertion is true, but the reason is false.

### Final Answer
- The correct answer is: **Assertion is true, but Reason is false.**