Respiration in Plants Test

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Respiration in Plants Test - 40

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Question 1
1 / -0

By aerobic respiration of 1 molecule of PGAL how many ATP get synthesized?

A
8 ATP

B
2 ATP

C
19 ATP

D
36 ATP
Question 2
1 / -0

In the process of respiration, the largest amount of energy is produced during

A
Anaerobic respiration.

B
Krebs cycle and oxidative phosphorylation.

C
Glycolysis.

D
None of the above.

Solution

During the process of respiration, glucose is broken down into pyruvic acid during the process of glycolysis. No oxygen is consumed nor any molecule of carbon dioxide is released in the process. The pyruvic acid molecule can be completely oxidised to carbon dioxide and water or incompletely oxidised to produce ethanol and carbon dioxide (alcohol fermentation) or lactic acid (lactic acid fermentation). The process of glycolysis occurs in cytoplasm, like the reactions of fermentation. For the process of aerobic respiration pyruvic acid needs to be transported to mitochondria. In the process of glycolysis only 2 molecules of ATP are produced. Maximum energy is released, when the reduced coenzymes produced in the process of Krebs cycle are oxidised in the process of oxidative phosphorylation in electron transport chain.
Question 3
1 / -0

Incomplete breakdown of sugars in anaerobic respiration forms

A
Glucose and $$CO_{2}$$.

B
Alcohol and $$CO_{2}$$.

C
Water and $$CO_{2}$$.

D
Fructose and water.

Solution

During the process of respiration glucose is broken down into pyruvic acid during the process of glycolysis. No oxygen is consumed nor any molecule of carbon dioxide is released in the process. The pyruvic acid molecule can be completely oxidised to carbon dioxide and water or incompletely oxidised to produce ethanol and carbon dioxide (alcohol fermentation) or lactic acid (lactic acid fermentation).
Question 4
1 / -0

During conversion of pyruvic acid into acetyl Co-A, the pyruvic acid is

A
Oxidised.

B
Reduced.

C
Isomerised.

D
Condensed.

Solution

The pyruvic acid formed after glycolysis may be completely oxidised into carbon dioxide and water as in aerobic respiration or may be incompletely broken down into ethyl alcohol or lactic acid during fermentation process. For the process of aerobic respiration first pyruvic acid is oxidatively decarboxylated to yield Acetyl CoA. As pyruvic acid is a three carbon atom containing molecule and acetyl CoA is a two carbon atom containing molecule, when one molecule of pyruvic acid is converted to one molecule of acetyl CoA, one molecule of carbon dioxide is released. Hence, it is a decarboxylation reaction. In this reaction one unit of reduced coenzyme $$NADH_2$$ is simultaneously synthesized.
Question 5
1 / -0

Which of the following is not an intermediate in Krebs cycle?

A
Acetic acid

B
Succinyl coenzyme A

C
Malic acid

D
Citric acid

Solution

The TCA (Krebs) cycle starts with the condensation of acetyl group with oxaloacetic acid (OAA) and water to yield citric acid. The reaction is catalysed by the enzyme citrate synthase and a molecule of CoA is released. Citrate is then isomerised to isocitrate. It is followed by two successive steps of decarboxylation, leading to the formation of alpha ketoglutaric acid and then succinyl CoA. During the conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised. Succinic acid is converted to fumaric acid, fumaric to malic acid and finally malate to oxaloacetic acid. Thus oxaloacetate is regenerated for another round of Krebs cycle. There are three points in the cycle where $$NAD^+$$ is reduced to $$NADH +$$ $$H^+$$ and one point where FAD is reduced to FADH$${_2}$$. Acetic acid is not an intermediate of Krebs cycle.
Thus, the correct answer is option A.
Question 6
1 / -0

The stage up to which glycolysis and fermentation have a common pathway is

A
Dihydroxyacetone.

B
3-phosphoglyceradehyde.

C
Pyruvate.

D
Glucose-6-phosphate.

Solution

Glycolysis is the first step in the process of respiration. Glycolysis does not consumes any oxygen nor it releases any carbon dioxide. During glycolysis one molecule of glucose is broken into two molecules of pyruvate. The pyruvic acid formed after glycolysis may be completely oxidised into carbon dioxide and water as in aerobic respiration or may be incompletely broken down into ethyl alcohol or lactic acid during fermentation process.
Question 7
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Significance of Krebs cycle is

A
Synthesizes ATP.

B
Carries out aerobic respiration.

C
Oxidation of glucose.

D
All of the above.

Solution

During Krebs cycle, the food molecules are oxidised to produce energy in the form of ATP. It is the aerobic pathway of respiration producing energy for various life activities.
Question 8
1 / -0

The respiratory quotient of carbohydrate is

A
Unity.

B
Greater than unity.

C
Less than unity.

D
Equal to five.

Solution

Respiratory quotient is defined as the volume of carbon dioxide released to the volume of oxygen consumed during the respiration process. Its value is one for oxidation of carbohydrates and less than one for oxidation of fats and proteins. The value is more than one for oxidation of organic acids.
Question 9
1 / -0

Alcoholic fermentation takes place in the presence of

A
Maltase.

B
Zymase.

C
Amylase.

D
Invertase.

Solution

Zymase is an enzyme complex produced by fungi and occurring naturally by yeast cells. Zymase is responsible for the fermentation of sugars into ethanol and carbon dioxide. The rate of activity varies from one strain to another strain of yeast.
Thus, the correct answer is option B.
Question 10
1 / -0

Respiratory quotient of which diet is less than unity?

A
Carbohydrate

B
Fats

C
Organic acid

D
Sugar

Solution

Respiratory quotient (RQ) is defined as the volume of carbon dioxide released to the volume of oxygen absorbed during the process of aerobic respiration.
As fats are considerably much more reduced form of carbon as compared to carbohydrates and organic acids, their respiration requires much more oxygen as compared to respiration of sugars (carbohydrates) or organic acids. Thus, the value of RQ for fats is less than one.

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Respiration in Plants Test - 40

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Question 1

8 ATP

2 ATP

19 ATP

36 ATP

Question 2

Anaerobic respiration.

Krebs cycle and oxidative phosphorylation.

Glycolysis.

None of the above.

Solution

Question 3

Glucose and $$CO_{2}$$.

Alcohol and $$CO_{2}$$.

Water and $$CO_{2}$$.

Fructose and water.

Solution

Question 4

Oxidised.

Reduced.

Isomerised.

Condensed.

Solution

Question 5

Acetic acid

Succinyl coenzyme A

Malic acid

Citric acid

Solution

Question 6

Dihydroxyacetone.

3-phosphoglyceradehyde.

Pyruvate.

Glucose-6-phosphate.

Solution

Question 7

Synthesizes ATP.

Carries out aerobic respiration.

Oxidation of glucose.

All of the above.

Solution

Question 8

Unity.

Greater than unity.

Less than unity.

Equal to five.

Solution

Question 9

Maltase.

Zymase.

Amylase.

Invertase.

Solution

Question 10

Carbohydrate

Fats

Organic acid

Sugar

Solution

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