Assertion : Crescograph was invented by Sir J.C. Bose.
Reason: Crescograph can magnify the growth upto 10,000 times.

Options

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

Answer

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

### Step-by-Step Solution:

1. **Identify the Assertion**: The assertion states that "Crescograph was invented by Sir J.C. Bose."
- **Evaluation**: This statement is true. The Crescograph, a device used to measure plant growth, was indeed invented by Sir Jagadish Chandra Bose (often abbreviated as J.C. Bose).

2. **Identify the Reason**: The reason states that "Crescograph can magnify the growth up to 10,000 times."
- **Evaluation**: This statement is also true. The Crescograph is capable of magnifying the growth of plants significantly, up to 10,000 times, allowing researchers to observe and measure plant growth in detail.

3. **Determine the Relationship**: Now we need to assess whether the reason provides a correct explanation for the assertion.
- **Evaluation**: The reason does explain why the assertion is significant. The fact that the Crescograph can magnify growth up to 10,000 times highlights its importance and utility in studying plant growth, which supports the assertion that it was invented by J.C. Bose.

4. **Conclusion**: Since both the assertion and reason are true, and the reason correctly explains the assertion, we conclude that:
- **Final Answer**: Both Assertion and Reason are True, and Reason is the correct explanation of Assertion.