Assertion - Reasoning MCQs
Assertion: Alcoholic Fermentation takes place in the absence of oxygen
Reason: It occurs in yeast
(a) both A and R are true and R is the correct explaination of A
(b) both A and R are true bit R is not correct explainaition of A
(c) A is true but R is false
(d) A is false but R is true
Answers
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7
Both The assertion (Alcoholic Fermentation takes place in the absence of oxygen) and the Reason ( It occurs in yeast) are correct.
Explanation: In the process of Alcholic fermentation, oxygen is not present and this process takes place with the help of the microorganism yeast as:
- The first step of fermentation begins with the breakdown of sugars.
- The sugar is broken down with the help of some microorganisms such as yeast, and certain bacteria.
- With the help of yeast, the sugars are converted into pyruvate molecules and this process is called glycolysis.
- The yeast converts sugar into ethyl alcohol and carbon dioxide also undergoes anaerobic respiration which means oxygen is absent in this process.
- Therefore, (a) both A and R are true and R is the correct explanation of A, is the correct answer.
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3
Assertion and reason both are correct but reason is not the correct explanation of assertion.
- Alcoholic fermentation is carried out in anaerobic condition and is also called as ethanoic fermentation.
- First ,the universal pathway that is glycolysis takes place to produce pyruvate and then the 3 -C pyruvate is converted into 2-C ethanoic acid .
- Though the ATP produced in ethanoic fermentation is very low, only 2 moles of ATP is produced
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