$ The entire material world which can be seen and detected with instrument is like microscops and telescope is called universe.
! Living organisms are unevenly distributed in the biosphere

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

To solve the question, we need to analyze both the assertion and the reason provided. Here’s a step-by-step breakdown:

### Step 1: Analyze the Assertion
The assertion states: "The entire material world which can be seen and detected with instruments like microscopes and telescopes is called the universe."

- **Explanation**: The universe indeed encompasses everything that exists, including all matter and energy. Instruments like telescopes are used to observe celestial bodies (like stars and planets), while microscopes are used to observe microscopic organisms. Therefore, this assertion is true.

### Step 2: Analyze the Reason
The reason states: "Living organisms are unevenly distributed in the biosphere."

- **Explanation**: The biosphere includes various ecosystems found in the lithosphere (land), hydrosphere (water), and atmosphere (air). It is well-established that living organisms are not evenly distributed across these ecosystems due to factors like climate, geography, and availability of resources. Thus, this reason is also true.

### Step 3: Determine the Relationship Between Assertion and Reason
Now we need to determine if the reason provided is a correct explanation of the assertion.

- **Explanation**: While both statements are true, the uneven distribution of living organisms in the biosphere does not explain why the material world observed through instruments is referred to as the universe. The assertion is about the definition of the universe, while the reason discusses the distribution of life, which is a separate concept.

### Step 4: Choose the Correct Option
Based on the analysis:
- Both the assertion and the reason are correct.
- However, the reason does not serve as a correct explanation for the assertion.

Thus, the correct answer is: **B) Both assertion and reason are correct, but reason is not the correct explanation of assertion.**

---