Respiration in Plants Test

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Respiration in Plants Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

In alcoholic fermentation

A
Triose phosphate is the electron donor, while acetaldehyde is the electron acceptor.

B
Triose phosphate is the electron donor, while pyruvic acid is the electron acceptor.

C
There is no electron donor.

D
Oxygen is the electron acceptor.

Solution

Alcoholic fermentation also referred to as ethanol fermentation, is a biological process in which elements, such as glucose, fructose and sucrose are converted into cellular energy and thereby produce ethanol and carbon dioxide as a metabolic waste product.
During fermentation, glucose undergoes glycolysis and yields pyruvic acid, which then converted to acetyl CoA. Then glyceraldehyde phosphate is produced, which then converted to acetaldehyde and this acetaldehyde converted into ethanol. So, in alcohol fermentation triose phosphate is the electron donor, while acetaldehyde is the electron acceptor.
So, the correct answer is option A.
Question 2
1 / -0

R.Q of the succulents can be

A
0

B
1

C
0.7

D
Both (A) and (B)

Solution

CAM plants open their stomata only at night and absorbs $$CO_2$$, which then converted into malate by acidification. During night time oxygen is absorbed continuously but no $$CO_2$$ is evolved. There fore R.Q in night is zero. During day time, malate gets converted to $$CO_2$$ and $$C_3$$ photosynthesis occurs. During day time amount of $$CO_2$$ evolved is equal to the amount of $$O_2$$ absorbed. So, R.Q at day time is 1. Since succulents are CAM plants, their R.Q at night is zero and day is 1. Thus, option D is correct and other options are incorrect.
Question 3
1 / -0

Acetyl CoA is synthesized in the

A
Cytosol

B
Inner membrane of mitochondria

C
Matrix of mitochondria

D
$${F_1}$$ particles of mitochondria

Solution

Pyruvic acid is the product of glycolysis that takes place in the cytosol. Pyruvate dehydrogenase complex is a cluster of three enzymes and is present in multiple copies in the matrix mitochondria of eukaryotic cells. It catalyzes irreversible oxidative decarboxylation of pyruvate into acetyl-CoA and carbon dioxide. Inner mitochondrial membrane carries electron transport chain. $$F_1$$ particles of mitochondria catalyze the synthesis of ATP using the protonmotive force. Thus, the correct answer is option C.
Question 4
1 / -0

The last acid produced in the Kreb's cycle of aerobic respiration

A
Oxaloacetic acid

B
Malic acid

C
a- ketoglutaric acid

D
Succinic acid

Solution

The last acid produced in the Krebs cycle of aerobic respiration is oxaloacetic acid. Oxaloacetic acid is produced by the conversion of malate by malate dehydrogenase.
Malic acid, succinic acid and ketoglutaric acid are the intermediate acids in Krebs cycle.
Thus, the correct answer is option A.
Question 5
1 / -0

Which one of the following represents fermentation?

A
$${C_6H_{12}O_6\xrightarrow[enzyme]{yeast}CH_3COOH+H_2O}$$

B
$${C_6H_{12}O_6\xrightarrow[enzyme]{yeast}C_2H_5OH+CO_2}$$

C
$${C_6H_{12}O_6\rightarrow CH_3OH+H_2O}$$

D
$${C_6H_{12}O_6\xrightarrow[enzyme]{yeast}CH_3COOH+H_2O+CO_2}$$

Solution

Alcoholic fermentation, also referred to as ethanol fermentation. It is a biological process in which elements, such as glucose, fructose and sucrose are converted into cellular energy and thereby produce ethanol and carbon dioxide, as metabolic waste products. Because yeasts perform this conversion in the absence of oxygen, alcoholic fermentation is considered an anaerobic process. So, option B is correct.
Question 6
1 / -0

Respiratory quotient of which of the following diet is less than unity?

A
Carbohydrate

B
Fats

C
Organic acid

D
Sugar

Solution

Respiratory quotient is the ratio of the amount of CO$$_2$$ eliminated to that of O$$_2$$ consumed. Thus, it is evident that it solely depends on the nature of the substrate. For example, hexose sugar will have the value of R.Q = 1 because the volume of CO$$_2$$ and volume of O$$_2$$ stays the same. Fats have an R.Q less than one. There is consumption of more O$$_2$$ than the carbon dioxide which gets eliminated and the organic acids will have their R.Q. values more than 1 because of the elimination of more CO$$_2$$ molecules than the consumption of molecules.
Thus, the correct answer is option B.
Question 7
1 / -0

Who reported that glucose is involved in the production of energy in aerobic respiration?

A
Hans Krebs

B
M. Calvin

C
L. Pasteur

D
R. Koch

Solution

Sir Hans Adolf Krebs was a German-born British physician and biochemist. He is best known for his discoveries of two important chemical reactions in the body, namely the urea cycle and the citric acid cycle.
Calvin invented the Calvin cycle or dark reaction of photosynthesis. Pasteur postulated the Pasteur effect. Koch discovery is associated with tuberculosis. Thus, the correct answer is option A.
Question 8
1 / -0

The process used in conversion of pyruvate to acetyl CoA is

A
Oxidative dehydration

B
Oxidative decarboxylation

C
Oxidative phosporylation

D
Oxidative dephosphorylation

E
None of the above

Solution

Pyruvate decarboxylation or oxidative decarboxylation reaction is the far from equilibrium biochemical reaction that uses pyruvate to form acetyl-CoA, releasing NADH, a reducing equivalent, and carbon dioxide via decarboxylation. This reaction is very common in most organisms as a link between glycolysis and the citric acid cycle. So, the process used in conversion of pyruvate to acetyl CoA is oxidative decarboxylation. Thus, option B is correct.
Question 9
1 / -0

The product of fermentation is

A
Ethanol and lactic acid

B
Acetic acid and lactic acid

C
Ethanol and acetic acid

D
All of the above

Solution

Fermentation is a metabolic process in which an organism converts a carbohydrate, such as starch or a sugar, into an alcohol or an acid. For example, yeast perform fermentation to obtain energy by converting sugar into alcohol. Lactic acid fermentation takes place in muscles during heavy exercise producing lactic acid. The products of fermentation are acetic acid, lactic acid, ethanol etc.
Thus, the correct answer is option D.
Question 10
1 / -0

Which of the following reactions is endergonic?

A
$${ATP\rightarrow ADP +P_i}$$

B
$${NADH\rightarrow NAD^+ +H^+}$$

C
$${(CH_2O)_n+O_2\rightarrow CO_2+H_2O}$$

D
None of the above

Solution

An endergonic reaction is a reaction that requires energy to be absorbed in order for it to take place. Break down of ATP, NADH and carbohydrates reactions are exergonic reactions.

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Respiration in Plants Test - 31

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Question 1

Triose phosphate is the electron donor, while acetaldehyde is the electron acceptor.

Triose phosphate is the electron donor, while pyruvic acid is the electron acceptor.

There is no electron donor.

Oxygen is the electron acceptor.

Solution

Question 2

0

1

0.7

Both (A) and (B)

Solution

Question 3

Cytosol

Inner membrane of mitochondria

Matrix of mitochondria

$${F_1}$$ particles of mitochondria

Solution

Question 4

Oxaloacetic acid

Malic acid

a- ketoglutaric acid

Succinic acid

Solution

Question 5

$${C_6H_{12}O_6\xrightarrow[enzyme]{yeast}CH_3COOH+H_2O}$$

$${C_6H_{12}O_6\xrightarrow[enzyme]{yeast}C_2H_5OH+CO_2}$$

$${C_6H_{12}O_6\rightarrow CH_3OH+H_2O}$$

$${C_6H_{12}O_6\xrightarrow[enzyme]{yeast}CH_3COOH+H_2O+CO_2}$$

Solution

Question 6

Carbohydrate

Fats

Organic acid

Sugar

Solution

Question 7

Hans Krebs

M. Calvin

L. Pasteur

R. Koch

Solution

Question 8

Oxidative dehydration

Oxidative decarboxylation

Oxidative phosporylation

Oxidative dephosphorylation

None of the above

Solution

Question 9

Ethanol and lactic acid

Acetic acid and lactic acid

Ethanol and acetic acid

All of the above

Solution

Question 10

$${ATP\rightarrow ADP +P_i}$$

$${NADH\rightarrow NAD^+ +H^+}$$

$${(CH_2O)_n+O_2\rightarrow CO_2+H_2O}$$

None of the above

Solution

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