Question

Assertion (A): Till date no man made technology has been able to rival the microbial treatment of sewage. Reason (R): Major part of the waste water is human excreta, this may contain organic matter, microbes, and some pathogens.

• A. Both (A) and (R) are correct and (R) is the correct explanation to (A)
• B. Both (A) and (R) are correct but (R) is not correct explanation for (A)
• C. (A) is correct (R) is wrong
• D. (A) is wrong (R) is correct

Hint:

Microbes are the most efficient natural cleaners of sewage!

Answer 1

The Correct Option is A

Step 1: Restate the parts.
Assertion: no man made technology has yet beaten microbial treatment of sewage. Reason: most waste water is human excreta with organic matter, microbes, and some pathogens.

Step 2: Judge the assertion.
A is correct. Microbes break down sewage so well and so cheaply that no purely mechanical method has matched them.

Step 3: Judge the reason.
R is also correct. Sewage really is mostly human waste rich in organic matter, plus microbes and pathogens.

Step 4: Check the link.
Now ask if R explains A. Yes it does. Because the waste is biodegradable organic matter, microbes, which naturally feed on such material, are perfectly suited to clean it. So the nature of the waste is exactly why microbes win.

Step 5: Choose the option.
Both A and R are correct, and R is the correct explanation of A.

Step 6: Conclusion.
Therefore the correct answer is "Both (A) and (R) are correct and (R) is the correct explanation to (A)". \[ \boxed{\text{A and R true, R explains A}} \]