Assertion :- The original drifted population in new habitat becomes founder and the effect is called founder effect.
Reason :- Darwin finches of Galapagos island shows adaptive radiation.

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 a 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 assertion and reason question regarding the founder effect and adaptive radiation, we will break down the concepts step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "the original drifted population in a new habitat becomes the founder and the effect is called the founder effect."
- This means that when a small group of individuals from a larger population migrates to a new area, they establish a new population. This new population is referred to as the "founders," and the genetic differences that arise due to this small founding group are termed the "founder effect."

2. **Understanding the Reason**:
- The reason states that "Darwin's finches of Galapagos Island show adaptive radiation."
- Adaptive radiation refers to the process where a single ancestral species rapidly diversifies into a wide variety of forms to adapt to different environments or niches. In the case of Darwin's finches, they evolved different beak shapes to exploit various food sources available on the islands.

3. **Evaluating the Relationship**:
- Both the assertion and reason are true statements. However, the reason does not explain the assertion. The founder effect is about the genetic consequences of a small population establishing itself in a new habitat, while adaptive radiation is about the diversification of species from a common ancestor in response to different environmental pressures.

4. **Conclusion**:
- Since both the assertion and reason are true but the reason does not explain the assertion, the correct answer is that the assertion is true and the reason is also true, but the reason is not a correct explanation of the assertion.

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