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Assertion : Fermentation is the incomple...

Assertion : Fermentation is the incomplete oxidation of glucose into lactic acid or ethanol.
Reason : It takes place under anaerobic conditions in prokaryotes only.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
c

Fermentation is the incomplete oxidation of glucose under anaerobic conditions. In yeast (eukaryote) the pyruvic acid is converted to `CO_(2)` and ethanol. Other organsims like some bacteria produce lactic acid from pyruvic acid. In animal cells also, like muscles during exercise when oxygen in inadequate for cellular respiration pyruvic acid is reduced to lactic acid by lactate dehydrogenase. Fermentation takes place under anaerobic conditions in many prokaryotes, unicellular eukaryotes and in germinating seeds.
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Anaerobic reactions after glycolysis produce lactic acid, or ethanol.

In our skeletal muscle under aerobic conditions lactic acid is formed.

Knowledge Check

  • Fermentation takes place under anaerobic conditions in

    A
    Many prokaryotes
    B
    Unicellular eukaryotes
    C
    Germinating seeds
    D
    All of the above
  • Incomplete oxidation of glucose in anaerobic respiration forms

    A
    Glucose and `CO_2`
    B
    `H_2O and CO_2`
    C
    Fructose and `H_2O`
    D
    Alcohol and `CO_2`
  • Assertion : Fermentation occurs by incomplete oxidation of glucose. Reason : Yeast form ethanol & CO_(2) from pyruvic acid.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is not correct explanation of A
    C
    A is true but R is false
    D
    A and R are false
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