Assertion :- Most distinct annual rings are formed in tropical regions.
Reason :- Climatic variations are sharp in tropical regions.

Options

A. If both Assertion & Reason are True & Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but the Reason is 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 analyze the assertion and reason provided in the question, let's break it down step by step:

### Step 1: Understand the Assertion
The assertion states that "Most distinct annual rings are formed in tropical regions." Annual rings, also known as growth rings, are formed due to the seasonal growth patterns of trees. In temperate regions, where there are distinct seasons, trees exhibit clear differences in growth rates between spring and summer (early wood) and autumn and winter (late wood).

**Hint:** Consider the climatic conditions of tropical regions compared to temperate regions.

### Step 2: Understand the Reason
The reason given is that "Climatic variations are sharp in tropical regions." This statement suggests that there are significant changes in climate throughout the year in tropical areas. However, tropical regions typically experience less variation in climate, with more consistent temperatures and rainfall throughout the year.

**Hint:** Think about how climate affects tree growth and the formation of annual rings.

### Step 3: Analyze the Relationship Between Assertion and Reason
To determine if the assertion is true or false, we need to consider the nature of annual rings. Distinct annual rings are primarily formed in regions with significant seasonal changes (like temperate regions), where the cambium layer is active during spring and summer, leading to the formation of early wood, and less active in autumn and winter, leading to late wood.

Since tropical regions do not experience sharp climatic variations, the formation of distinct annual rings is minimal. Therefore, the assertion is false.

**Hint:** Reflect on how seasonal changes influence the growth patterns of trees.

### Step 4: Conclusion
Both the assertion and the reason are false. The assertion is incorrect because distinct annual rings are not primarily formed in tropical regions. The reason is also incorrect because climatic variations are not sharp in tropical regions.

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

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