Question

Choose the correct statements among the following: A) Organisms that enrich the nutrient quality of soil is called biofertilizers B) Certain bacteria groups anaerobically on cellulosic material produce large amount of Methane, $CO_{2}$ and $H_{2}$ C) In anaerobic sludge digester bacteria produce hydrogen sulphide only D) Wine and beer are produced by distillation of rice

• A. A, B
• B. B, A
• C. C, D
• D. B, C

Hint:

Methanogens produce biogas from cellulosic biomass.

Answer 1

The Correct Option is A

Step 1: The task.
We must pick the pair of correct statements about biofertilizers and microbes.

Step 2: Check statement A.
A says organisms that improve soil nutrient quality are biofertilizers. This is the right definition, so A is correct.

Step 3: Check statement B.
B says certain bacteria work anaerobically on cellulose and make a lot of methane, $CO_2$, and $H_2$. This is true for methanogens that produce biogas, so B is correct.

Step 4: Check statement C.
C says the anaerobic sludge digester bacteria make only hydrogen sulphide. That is wrong, because they make a mixture of gases, mainly methane, not just hydrogen sulphide.

Step 5: Check statement D.
D says wine and beer are made by distillation of rice. That is wrong. Wine and beer are made by fermentation, without distillation, and not from rice in this way.

Step 6: Conclusion.
Only A and B are correct, so the correct answer is "A, B". \[ \boxed{\text{A, B}} \]