Assertion : Animals curl into a ball, when they feel very cold.
Reason : Animals by curling their body reduces the surface area.

Options

A. Statement -`1` is True , Statement -`2` is True , Statement -`2` is correct explanation for Statement - `1`
B. Statement -`1` is True , Statement -`2` is True , Statement -`2` is not correct explanation for Statement - `1`
C. Statement -`1` is True , Statement -`2` is False.
D. Statement -`1` is False , Statement -`2` is True.

Answer

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

### Step 1: Understand the Assertion
The assertion states that "Animals curl into a ball when they feel very cold." This is a behavior observed in many animals during cold weather. The action of curling up is a common instinctive response to conserve body heat.

**Hint:** Think about how animals adapt to their environment, especially in extreme conditions.

### Step 2: Understand the Reason
The reason given is that "Animals by curling their body reduce the surface area." This is scientifically accurate. When animals curl up, they minimize the exposed surface area of their body to the cold air, which helps in reducing heat loss.

**Hint:** Consider the relationship between surface area and heat loss in terms of physical principles.

### Step 3: Analyze the Relationship Between Assertion and Reason
Now, we need to determine if the reason provided correctly explains the assertion. Since animals curling up does indeed reduce their surface area, and this reduction helps them conserve heat, the reason supports the assertion.

**Hint:** Reflect on whether the reason logically connects to the assertion and if it provides a valid explanation.

### Step 4: Conclusion
Both the assertion and the reason are true, and the reason accurately explains why animals curl into a ball when they feel cold. Therefore, we can conclude that the assertion is true, the reason is true, and the reason is the correct explanation for the assertion.

**Final Answer:** Both the assertion and the reason are true, and the reason is the correct explanation for the assertion.

### Summary of Steps:
1. Analyze the assertion about animal behavior in cold.
2. Understand the reason related to surface area and heat loss.
3. Determine the relationship between the assertion and the reason.
4. Conclude that both statements are true and connected.