The following is a simplified diagram showing the fate of glucose during aerobic and anaerobic respiration- Identify the end products that are formed at stages indicated A - B - C and D- Identify the correct option from those given below-A- A- Carbon dioxide and water- B- Pyruvic acid- C- Ethyl alcohol and carbon dioxide- D- lactic acidB- A - Pyruvic acid- B-Ethyl alcohol and carbon dioxide- C-lactic acid- D- Carbon dioxide and waterC- A - Pyruvic acid- B- Carbon dioxide and water- C-lactic acid- D-Ethyl alcohol and carbon dioxide- D- lactic acidD- A - Pyruvic acid- B- Carbon dioxide and water- C- Ethyl alcohol and carbon dioxide- D - Lactic acid

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Respiration in Plants

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Question

The following is a simplified diagram showing the fate of glucose during aerobic and anaerobic respiration. Identify the end products that are formed at stages indicated A, B, C and D. Identify the correct option from those given below.

A- Carbon dioxide and water, B- Pyruvic acid, C- Ethyl alcohol and carbon dioxide, D- lactic acid

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A – Pyruvic acid, B- Carbon dioxide and water, C-lactic acid, D-Ethyl alcohol and carbon dioxide, D- lactic acid

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A – Pyruvic acid, B- Carbon dioxide and water, C- Ethyl alcohol and carbon dioxide, D – Lactic acid

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A – Pyruvic acid, B-Ethyl alcohol and carbon dioxide, C-lactic acid, D- Carbon dioxide and water

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Solution

The correct option is C A – Pyruvic acid, B- Carbon dioxide and water, C- Ethyl alcohol and carbon dioxide, D – Lactic acid
The product of glycolysis is A pyruvic acid, the pyruvate formed enters the Kreb's cycle in aerobic respiration and the products of Kreb’s cycle are CO₂ and water. Therefore B is carbon dioxide and water. In the absence of oxygen, the glycolytic product pyruvate enters the anaerobic pathway, it then undergoes fermentation to form either ethyl alcohol or lactic acid. Formation of ethyl alcohol is accompanied by the formation of carbon dioxide. Therefore C is ethyl alcohol and carbon dioxide and D is lactic acid.

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Similar questions

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

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

Lack of oxygen in muscles often leads to cramps in the legs of sprinters. This is due to conversion of pyruvate to :
(a) ethanol
(b) carbon dioxide
(c) acetic acid
(d) lactic acid

Q. Complete the following flowchart.
Carbohydrates enter

\to

______(a)_____

\to

Pyruvic acid

\to

Acetyl-CoA enters

\to

____(b)____

\to

Carbon dioxide+ Water+ Energy

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