NEET Biology: fermentation (anaerobic) Practice Questions
15 free multiple-choice questions on fermentation (anaerobic) (Respiration) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which substance is typically produced as a byproduct during alcoholic fermentation in yeast?
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Correct answer: D — Ethanol
Alcoholic fermentation, which occurs in yeast, results in the production of ethanol (alcohol) and carbon dioxide.
Q2. Which of the following substances is produced as a by-product during anaerobic fermentation in yeast?
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Correct answer: D — Ethanol
During alcoholic fermentation in yeast, glucose is broken down into ethanol (alcohol) and carbon dioxide.
Q3. Which end product is formed during the anaerobic fermentation of pyruvate in muscle cells?
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Correct answer: B — Lactic acid
In human muscle cells performing anaerobic respiration, pyruvate is converted into lactic acid.
Q4. Lactic acid fermentation occurs in muscle cells primarily to regenerate which molecule?
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Correct answer: A — Pyruvate
In anaerobic conditions, lactic acid fermentation is used to regenerate NAD+ from NADH, allowing glycolysis to continue.
Q5. In yeast, the process of alcoholic fermentation results in the production of which primary end product?
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Correct answer: D — Ethanol and Carbon dioxide
Alcoholic fermentation in yeast converts pyruvate into ethanol and carbon dioxide, which are the end products of this process.
Q6. During anaerobic respiration in mammalian muscle cells, which end product is formed when oxygen is scarce?
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Correct answer: C — Lactic acid
When oxygen is absent, pyruvate is converted into lactic acid, which is the primary end product in muscle tissue under anaerobic conditions.
Q7. Which of the following molecules is the end product of lactic acid fermentation in human muscle cells?
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Correct answer: D — Lactic acid
During anaerobic conditions in muscle cells, pyruvate is reduced to lactic acid, which is then released into the blood.
Q8. What is the immediate fate of pyruvate in the context of anaerobic respiration?
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Correct answer: A — Conversion to lactate or ethanol
When oxygen is absent, pyruvate is converted into lactate (in some bacteria) or ethanol (in yeast) to regenerate NAD⁺ needed for glycolysis.
Q9. Fermentation in anaerobic conditions is essential primarily because it allows for the regeneration of which coenzyme?
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Correct answer: D — NAD⁺
The main purpose of fermentation is to regenerate NAD⁺ from NADH, which is required to sustain the continuation of glycolysis (the only pathway operating anaerobically).
Q10. During strenuous exercise, muscle cells perform anaerobic respiration in the absence of sufficient oxygen. What is the primary end product formed by this process?
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Correct answer: B — Lactic Acid
When oxygen supply is insufficient, muscle cells perform anaerobic respiration, leading to the breakdown of glucose and the formation of lactic acid (lactic acid fermentation) as the end product to regenerate NAD+ for glycolysis.
Q11. In anaerobic conditions, what metabolic pathway does the breakdown of glucose primarily follow to generate a small amount of ATP?
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Correct answer: B — Glycolysis
When oxygen is unavailable, glucose is broken down via glycolysis, which produces a small amount of ATP and pyruvate, leading to fermentation.
Q12. Yeast predominantly performs which type of respiration when oxygen is scarce?
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Correct answer: D — Alcoholic fermentation
Yeast utilizes alcoholic fermentation to generate energy when oxygen is not available.
Q13. Which type of fermentation pathway occurs in prokaryotes like bacteria when oxygen is absent?
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Correct answer: D — Fermentation to Lactic Acid
Most anaerobic bacteria utilize fermentation pathways, often resulting in the production of lactic acid or other organic acids, to regenerate NAD⁺.
Q14. What is the primary end product of alcoholic fermentation carried out by yeast?
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Correct answer: C — Ethanol
Yeast converts pyruvate into ethanol and carbon dioxide during alcoholic fermentation.
Q15. Which of the following is the end product formed during alcoholic fermentation by yeast?
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Correct answer: C — Ethanol and Carbon dioxide
During alcoholic fermentation, pyruvate is converted into ethanol (alcohol) and carbon dioxide.
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