KCET · BIOLOGY · STD 12 - 8. Microbes in Human Welfare

During sewage treatment biogas produced includes

A hydrogen sulphide, nitrogen, methane
B methane, oxygen, hydrogen sulphide
C methane, hydrogen sulphide, carbon dioxide
D hydrogen sulphide, methane, sulphur oxide

Verified Solution

Answer & Solution

Correct Answer

(C) methane, hydrogen sulphide, carbon dioxide

Step-by-step Solution

Detailed explanation

(C) methane, hydrogen sulphide, carbon dioxide,
Biogas is a renewable fuel that is produced when organic matter such as food or animal waste, is proper down by microbes. Biogas is made up of methane (50-70%), carbon dioxide (30-40%) with traces nitrogen, hydrogen sulphide and hydrogen.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Column-I contains some terms and Column-II contains their meanings. Match them property and choose the right answer.

Column-I	Column-II
A. Glycogenesis	1. Conversion of glycogen to glucose
B. Glycosuria	2. Conversion of glucose to glycogen
C. Gluconeogenesis	3. Excretion of glucose in urine
D. Glycogenolysis	4. Conversion of noncarbohydrate sources to glucose
	5. Conversion of glucose to starch

KCET 2011 Medium

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