Assertion: Lemmings of Tundra follow population fluctuations.
Reason: These show sudden increase in population in shorl time followed by population crash.

Options

A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.
C. If Assertion is true but the Reason is false
D. If both Assertion and Reason are false.

Explanation

To solve the question regarding the assertion and reason about lemmings in the tundra, we can follow these steps:

### Step 1: Understand the Assertion
The assertion states that "Lemmings of Tundra follow population fluctuations." This means that the population of lemmings in the tundra experiences changes over time, which is a characteristic of many animal populations.

**Hint:** Look for examples of how populations can change in size over time in different environments.

### Step 2: Understand the Reason
The reason provided is that "these show sudden increase in population in short time followed by population crash." This indicates that lemmings can rapidly increase in number and then experience a significant decline in population shortly thereafter.

**Hint:** Consider what factors might lead to rapid population growth and subsequent decline in animal populations.

### Step 3: Analyze the Relationship
Now, we need to determine if the reason correctly explains the assertion. While both statements are true, the reason does not fully explain why lemmings exhibit population fluctuations. Population fluctuations can be influenced by various factors, including food availability, predation, and environmental conditions, not just the rapid increase and crash.

**Hint:** Think about other ecological factors that could influence population dynamics beyond just reproduction rates.

### Step 4: Conclusion
Both the assertion and reason are true, but the reason is not the correct explanation for the assertion. Therefore, the correct choice is that both statements are true, but the reason does not correctly explain the assertion.

**Final Answer:** The correct option is that both the assertion and reason are true, but the reason is not the correct explanation of the assertion.