Respiration in Plants Test

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Respiration in Plants Test - 38

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Question 1
1 / -0

The value of R.Q. for a starved cell is

A
Zero.

B
0.8 / less than one.

C
1 / unit.

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 (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.
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.
Under conditions of starvation carbohydrates are not available and proteins or fats are used as cellular fuel and hence the expected value of RQ is less than unity.
Question 2
1 / -0

R.Q. of an actively photosynthesizing tissue is

A
Infinity.

B
< 1.

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 as 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.
In an actively photosynthesizing tissue, the net volume of carbon dioxide evolved (i.e., volume of carbon dioxide produced in respiration minus that utilised in photosynthesis) is equal to net volume of oxygen (i.e., volume of oxygen consumed in respiration minus that evolved in photosynthesis).
Question 3
1 / -0

When the evolution of $$CO_2$$ is more than the intake of $$O_2$$, the respired substrate should be

A
Fatty acid.

B
Organic acid.

C
Glucose.

D
Polysaccharide.

Solution

The respiratory quotient depends upon the type of respiratory substrate used during respiration. When organic acids are metabolised more carbon dioxide is evolved than oxygen consumed. Hence, the value of RQ is more than one.
Question 4
1 / -0

Fermentation is represented by which of the following equation?

A
$$C_{6}H_{12}O_{6}\, \rightarrow\, 6CO_{2}\, +_\, 6H_{2}O\, +\, 673 K\, cal$$

B
$$C_{6}H_{12}O_{6}\, \rightarrow\, 2C_{2}H_{5}OH\, +\, 2CO_{2}$$

C
$$6CO_{2}\, +\, 12H_{2}O\, \rightarrow\, C_{6}H_{12}O_{6}\, +\, 6H_{2}O\, +\, 6O_{2}$$

D
$$6CO_{2}\, +\, 6H_{2}O\, \xrightarrow[chlorophyll]{light}\, C_{6}H_{12}O_{6}\, +\, 6O_{2}$$

Solution

In fermentation, say by yeast, the incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to $$CO_2$$ and ethanol. The enzymes, pyruvic acid decarboxylase and alcohol dehydrogenase catalyse these reactions. Other organisms like some bacteria produce lactic acid from pyruvic acid. In animal cells also, like muscles during exercise, when oxygen is inadequate for cellular respiration pyruvic acid is reduced to lactic acid by lactate dehydrogenase. In both lactic acid and alcohol fermentation not much energy is released; less than seven per cent of the energy in glucose is released and not all of it is trapped as high energy bonds of ATP.
Question 5
1 / -0

The pyruvic acid formed in glycolysis is oxidised to $$CO_{2}$$ and $$H_{2}O$$ in a cycle is called as

A
Calvin cycle.

B
Hill reaction.

C
Krebs cycle.

D
Nitrogen cycle.

Solution

The pyruvate formed during glycolysis is further degraded in a pathway called the Krebs cycle (also called the tricarboxylic acid cycle or citric acid cycle). In the Krebs cycle, the carbon of pyruvate is fully oxidized to carbon dioxide and release water in a series of oxidation-reduction reactions.
So the correct option is 'Krebs cycle'.
Question 6
1 / -0

Which of the following is a 5- carbon compound of Krebs cycle?

A
Citric acid

B
Fumaric acid

C
Oxalosuccinic acid

D
$$\alpha$$-ketoglutaric acid

Solution

The first decarboxylation reaction in Krebs cycle is catalyzed by isocitrate dehydrogenase in which one six carbon atom compound isocitrate is decarboxylated to yield five carbon atom containing alpha ketoglutaric acid.
Question 7
1 / -0

Product formed by the activity of malic dehydrogenase in the TCA cycle is

A
Fumaric acid.

B
Malic acid.

C
Oxaloacetic acid.

D
Succinic acid.

Solution

Malic acid dehydrogenase or malate dehydrogenase is a Krebs cycle enzyme, which converts malic acid into oxaloacetic acid with the simultaneous reduction of one NAD molecule into reduced coenzyme $$NADH_2$$.
Question 8
1 / -0

R.Q. is more than one in the case of

A
Fat

B
Fructose

C
Glucose

D
Organic acid

Solution

R.Q. is the ratio of the volume of carbon dioxide evolved and oxygen consumed in respiration.
Inorganic acids, the evolution of carbon dioxide is more than the oxygen require that is the reason organic acids has R.Q. more than 1.
So the correct option is 'Organic acid'.
Question 9
1 / -0

The end products of aerobic respiration of glucose is ______________.

A
$$CO_2\, +\, H_2O\, +\, ATP$$

B
$$CO_2$$ + pyruvic acid

C
$$CO_2$$ + ethyl alcohol

D
$$CO_2$$ + pyruvic acid + citric acid

Solution

The breaking of the C-C bonds of complex compounds through oxidation within the cells, leading to the release of a considerable amount of energy is called as respiration. During the process of aerobic respiration, oxygen is utilized and carbon dioxide, water and energy in the form of ATP are released as products.
Question 10
1 / -0

The number of ATP molecules produced from one Krebs cycle is

A
15

B
30

C
38

D
40

Solution

Total number of ATP produced during the breakdown of one acetyl-CoA is 12.
The Krebs cycle starts with acetyl-CoA, whereas pyruvic acid is the end product of glycolysis. When one molecule of pyruvic acid is converted to acetyl coA there is the synthesis of one molecule of reduced coenzyme $$NADH_2$$, which yields 3 molecules of ATP during oxidation by mitochondrial electron transport system. Considering these 3 molecules of ATP, the total ATP synthesized by one turn of Krebs cycle is (12+3) i.e., 15 molecules of ATP.

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Re-Attempt Weekly Quiz Competition

Respiration in Plants Test - 38

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Respiration in Plants Test - 38

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SHARING IS CARING

Question 1

Zero.

0.8 / less than one.

1 / unit.

Infinite.

Solution

Question 2

Infinity.

< 1.

> 1.

Zero.

Solution

Question 3

Fatty acid.

Organic acid.

Glucose.

Polysaccharide.

Solution

Question 4

$$C_{6}H_{12}O_{6}\, \rightarrow\, 6CO_{2}\, +_\, 6H_{2}O\, +\, 673 K\, cal$$

$$C_{6}H_{12}O_{6}\, \rightarrow\, 2C_{2}H_{5}OH\, +\, 2CO_{2}$$

$$6CO_{2}\, +\, 12H_{2}O\, \rightarrow\, C_{6}H_{12}O_{6}\, +\, 6H_{2}O\, +\, 6O_{2}$$

$$6CO_{2}\, +\, 6H_{2}O\, \xrightarrow[chlorophyll]{light}\, C_{6}H_{12}O_{6}\, +\, 6O_{2}$$

Solution

Question 5

Calvin cycle.

Hill reaction.

Krebs cycle.

Nitrogen cycle.

Solution

Question 6

Citric acid

Fumaric acid

Oxalosuccinic acid

$$\alpha$$-ketoglutaric acid

Solution

Question 7

Fumaric acid.

Malic acid.

Oxaloacetic acid.

Succinic acid.

Solution

Question 8

Fat

Fructose

Glucose

Organic acid

Solution

Question 9

$$CO_2\, +\, H_2O\, +\, ATP$$

$$CO_2$$ + pyruvic acid

$$CO_2$$ + ethyl alcohol

$$CO_2$$ + pyruvic acid + citric acid

Solution

Question 10

15

30

38

40

Solution

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