Assertion: Fermentation occurs by the incomplete oxidation of glucose.
Reason: Yeast forms ethanol & CO2 from pyruvic acid.

Both A and R are true and R is the correct explanation of A.

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Both A and R are true but R is not a correct explanation of A

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A is true but R is false

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A and R are false

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Solution

The correct option is B Both A and R are true but R is not a correct explanation of A
Fermentation, a type of anaerobic respiration seen in organisms like yeast, involves the partial oxidation of glucose and the release of ethanol and carbon dioxide as the end products. The reason for the incomplete oxidation of glucose is the absence of oxygen, not the products formed by the process.

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Similar questions

Q. Assertion : Fermentation is incomplete oxidation of glucose.

Reason : Pyruvic acid decarboxylase, alcohol dehydrogenase catalyze the reaction.

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

Q. The correct sequence of anaerobic reactions in yeast is

(a)

G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e m i t o c h o n d r i a - ------- \to E t h a n o l + C a r b o n d i o x i d e

(b)

G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e c y t o p l a s m - ----- \to L a c t i c a c i d

(c)

G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e m i t o c h o n d r i a - ------- \to L a c t i c a c i d

(d)

G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e c y t o p l a s m - ----- \to E t h a n o l + C a r b o n d i o x i d e

Question 12
The correct sequence of anaerobic reactions in yeast is

(a) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e m i t o c h o n d r i a - ------- \to E t h a n o l + C a r b o n d i o x i d e$
(b) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e c y t o p l a s m - ----- \to L a c t i c a c i d$
(c) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e m i t o c h o n d r i a - ------- \to L a c t i c a c i d$
(d) $G l u c o s e c y t o p l a s m - ----- \to P y r u v a t e c y t o p l a s m - ----- \to E t h a n o l + C a r b o n d i o x i d e$

Q. Assertion :Toddy becomes unpalatable after 24 hours. Reason: The fermentation of toddy is continued by naturally occurring yeasts.

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Assertion: Fermentation occurs by the incomplete oxidation of glucose. Reason: Yeast forms ethanol & CO2 from pyruvic acid.

Assertion: Fermentation occurs by the incomplete oxidation of glucose.
Reason: Yeast forms ethanol & CO2 from pyruvic acid.