Respiration in Plants Test

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Respiration in Plants Test - 36

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Weekly Quiz Competition

Question 1
1 / -0

Pyruvic acid is formed during

A
Krebs cycle.

B
Glycolysis.

C
Ornithine cycle.

D
Calvin cycle.

Solution

The process of glycolysis is the common process between aerobic and anaerobic respiration. The glycolysis occurs in cytoplasm and results in production of two molecules of pyruvic acid from one molecule of glucose. No oxygen is consumed nor any carbon dioxide is evolved during glycolysis.
Question 2
1 / -0

The net gain of ATP molecules from the process of glycolysis is

A
Zero.

B
Two.

C
Four.

D
Eight.

Solution

Process of glycolysis is carried out in cell cytoplasm. In this process one molecule of glucose is broken down into two molecules of pyruvic acid with the simultaneous production of 2 molecules of ATP by substrate level phosphorylation and 2 molecules of reduced coenzymes. If the reduced coenzymes are oxidised in mitochondria there will be a generation of 3 ATP molecules per molecule of reduced coenzyme. Hence, the process of glycolysis is believed to be the source of 8 molecules.
Question 3
1 / -0

Respiratory quotient (R. Q.) is defined as the

A
Vol. of $$O_{2}$$ / vol. of $$CO_{2}$$

B
Vol. of $$CO_{2}$$ / vol. of $$O_{2}$$

C
Vol. of $$O_{2}$$ / vol. of $$N_{2}$$

D
Vol. of $$N_{2}$$ / vol. of $$CO_{2}$$

Solution

The volume of carbon dioxide released and oxygen consumed in the process of respiration is called as respiratory quotient or R.Q of that substrate.
Question 4
1 / -0

In Opuntia ,the R.Q. will be

A
Equal to 1.

B
Less than 1.

C
More than 1.

D
Equal to 0.

Solution

Respiratory quotient (RQ) is defined as the ratio between volume of carbon dioxide released to volume of oxygen absorbed. Opuntia is a succulent plant. Succulents open their stomata in night, when atmospheric carbon dioxide is fixed temporarily into organic acids like oxaloacetate and malate. During daytime the stomata are closed and organic acids are decarboxylated to release carbon dioxide which is used in the synthetic processes of photosynthesis. As there is no net evolution of carbon dioxide, the value of RQ is zero in succulents like Opuntia.
Question 5
1 / -0

The number of ATP molecules formed during aerobic respiration in the break down of one glucose molecule via the malate-aspartate shuttle is

A
38.

B
18.

C
28.

D
4.

Solution

Number of ATP molecules formed during aerobic respiration in break down of one glucose molecule via malate aspartate shuttle is 38. The malate-aspartate shuttle is a biochemical system for translocating electrons produced during glycolysis across the semipermeable inner membrane of the mitochondrion for oxidative phosphorylation in eukaryotes. These electrons enter the electron transport chain of the mitochondria via reduction equivalents to generate ATP. The shuttle system is required because the mitochondrial inner membrane is impermeable to NADH, the primary reducing equivalent of the electron transport chain. To circumvent this, malate carries the reducing equivalents across the membrane.
Since the malate-aspartate shuttle regenerates NADH inside the mitochondrial matrix, it is capable of maximizing the number of ATPs produced in glycolysis (3/NADH), ultimately resulting in a net gain of 38 ATP molecules per molecule of glucose metabolized.
Question 6
1 / -0

The value of R.Q. at the compensation point is

A
Infinity.

B
Two.

C
> 1.

D
Zero.

Solution

During aerobic respiration, $$O_2$$ is consumed and $$CO_2$$ is released. The ratio of the volume of $$CO_2$$ evolved to the volume of $$O_2$$ consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio. Thus the following expression is used to calculate the value of RQ.
RQ= volume of $$CO_2$$ evolved/ volume of $$O_2$$ consumed.
At compensation point there is no net evolution of carbon dioxide. Hence, numerator in above expression is zero, giving the value of RQ as zero.
Question 7
1 / -0

The value of R.Q. for proteins is

A
Equal to one.

B
More than one.

C
Less than one.

D
Infinite.

Solution

During aerobic respiration, $$O_2$$ is consumed and $$CO_2$$ is released. The ratio of the volume of $$CO_2$$ evolved to the volume of $$O_2$$ consumed in respiration is called the respiratory quotient (R.Q) or respiratory ratio. The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of $$CO_2$$ and $$O_2$$ are evolved and consumed, respectively. When fats are used in respiration, the RQ is less than 1. When proteins are respiratory substrates the ratio would be about 0.9.
Question 8
1 / -0

What causes R. Q. to vary?

A
Respiratory substrates

B
Light and $$O_2$$

C
Respiratory products

D
Temperature

Solution

During aerobic respiration, $$O_2$$ is consumed and $$CO_2$$ is released. The ratio of the volume of $$CO_2$$ evolved to the volume of $$O_2$$ consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio. The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of $$CO_2$$ and $$O_2$$ are evolved and consumed, respectively. When fats are used in respiration, the RQ is less than 1. When proteins are respiratory substrates the ratio would be about 0.9.
Question 9
1 / -0

Respiratory quotient is expressed as which of the following equations?

A
$$O_2/CO_2$$

B
$$CO_2/O_2$$

C
$$O_2/H_2O$$

D
$$CO_2 - O_2$$

Solution

During aerobic respiration, $$O_2$$ is consumed and $$CO_2$$ is released. The ratio of the volume of $$CO_2$$ evolved to the volume of $$O_2$$ consumed in respiration is called the respiratory quotient (R.Q) or respiratory ratio. Thus the following expression is used to calculate the value of R.Q.
RQ= volume of $$CO_2$$ evolved/ volume of $$O_2$$ consumed.
Question 10
1 / -0

The enzyme involved in alcoholic fermentation is

A
Pyruvate decarboxylase.

B
Alcohol dehydrogenase.

C
Lactate dehydrogenase.

D
Both A and B.

Solution

Fermentation is a general term for the anaerobic degradation of glucose or other organic nutrients to obtain energy, conserved as ATP because living organisms first arose in an atmosphere without oxygen, anaerobic breakdown of glucose is probably the most ancient biological mechanism for obtaining energy from organic fuel molecules. The glucose is broken down into pyruvic acid. The pyruvic acid may undergo alcohol fermentation or lactic acid fermentation during anaerobic respiration. In alcohol fermentation, pyruvate is converted to acetaldehyde by the action of pyruvate decarboxylase. The acetaldehyde is converted to ethanol by alcohol dehydrogenase.
So, the correct answer is option D.

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Respiration in Plants Test - 36

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Respiration in Plants Test - 36

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Question 1

Krebs cycle.

Glycolysis.

Ornithine cycle.

Calvin cycle.

Solution

Question 2

Zero.

Two.

Four.

Eight.

Solution

Question 3

Vol. of $$O_{2}$$ / vol. of $$CO_{2}$$

Vol. of $$CO_{2}$$ / vol. of $$O_{2}$$

Vol. of $$O_{2}$$ / vol. of $$N_{2}$$

Vol. of $$N_{2}$$ / vol. of $$CO_{2}$$

Solution

Question 4

Equal to 1.

Less than 1.

More than 1.

Equal to 0.

Solution

Question 5

38.

18.

28.

4.

Solution

Question 6

Infinity.

Two.

> 1.

Zero.

Solution

Question 7

Equal to one.

More than one.

Less than one.

Infinite.

Solution

Question 8

Respiratory substrates

Light and $$O_2$$

Respiratory products

Temperature

Solution

Question 9

$$O_2/CO_2$$

$$CO_2/O_2$$

$$O_2/H_2O$$

$$CO_2 - O_2$$

Solution

Question 10

Pyruvate decarboxylase.

Alcohol dehydrogenase.

Lactate dehydrogenase.

Both A and B.

Solution

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