Respiration in Plants Test

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Respiration in Plants Test - 64

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Question 1
1 / -0

Turns of Krebs cycle required for complete oxidation of one molecule of glucose are

A
2

B
3

C
4

D
6

Solution

Complete oxidation of glucose molecules requires glycolysis, Krebs cycle and electron transport chain. Two molecules of pyruvic acid are produced at the end of glycolysis. Each molecule of pyruvate is then converted to acetyl CoA before entering the Krebs cycle. Hence, for two molecules of pyruvate, two turns of Krebs cycle is required. Hence, for complete oxidation of one molecule of glucose 2 turns of Krebs cycle are required.
Thus, the correct answer is '2.'
Question 2
1 / -0

In alcoholic fermentation, two molecules of glucose produce ethanol and CO$$_2$$ respectively

A
2 + 2

B
3 + 3

C
4 + 4

D
6 + 6

Solution

Alcoholic respiration is done by the yeast in which two molecules of ATP, carbon dioxide and alcohol is released and the process takes place in the absence of oxygen.
$$C_6H_{12}O_6 + 2ADP\rightarrow Pi 2C_2H_5OH + CO_2 + 2ATP$$
If 2 ATP and $$C_2$$ is released by molecule. So two glucose will release 4 ATP and $ $$CO_2$$.
So the correct option is '4 + 4'.
Question 3
1 / -0

Oxidative decarboxylation occurs during formation of

A
Citric acid and succinic acid

B
Citric acid and oxaloacetic acid

C
Acetyl CoA and succinyl CoA

D
Oxaloacetic acid and oxalosuccinic acid

Solution

Oxidative decarboxylation is a type of reaction in which there is oxidation of the substrate along with release of CO$$_2$$. During the process of cellular respiration, when the pyruvic acid gets converted to acetyl CoA, oxidation occurs and CO$$_2$$ is released. Same kind of a reaction occurs in Krebs' cycle when ketoglutarate is converted to succinyl CoA.
So the answer is 'Acetyl CoA and succinyl CoA'.
Question 4
1 / -0

Which one is amphibolic?

A
Glycolysis.

B
ETC.

C
Gluconeogenesis.

D
Krebs cycle.

Solution

The amphibolic pathway involves both catabolic and anabolic reactions and Kreb's cycle is its good example as it degrades acetyl coenzyme to yield carbon dioxide and energy is released in the form of NADH, FADH or it can be said that it is the catabolic pathway for carbohydrates and anabolic precursor of amino acids.
So the correct option is 'Krebs cycle'.
Question 5
1 / -0

TCA cycle is named after

A
Embden

B
Emerson

C
Krebs

D
Calvin

Solution

TCA is also known as Kreb's cycle has been named after the German biochemist Sir Hans Krebs in the year 1937 and got Nobel Prize for the same in year 1953.
So, the correct option is 'Krebs'.
Question 6
1 / -0

Acetyl CoA reacts with OAA to form

A
Formaldehyde

B
Acetate

C
Isocitrate

D
Citrate

Solution

Acetyl CoA thus formed from pyruvic acid in the link reaction can now enter Krebs' cycle by combining with oxaloacetic acid. OAA and acetyl CoA form a 6-carbon compound citric acid as first product of the cycle.
So, the correct answer is 'Citrate'.
Question 7
1 / -0

Which stages of aerobic respiration take place in matrix of mitochondria
i) Oxidative decarboxylation of pyruvic acid
ii) Glycolysis
iii) Krebs cycle
iv) Oxidative phosphorylation

A
i and ii only

B
ii and iii only

C
iii and iv only

D
i and iii only

E
i and iv only

Solution

After the process of glycolysis that occurs in cytoplasm, pyruvic acid thus formed enters mitochondria where it undergoes oxidative decarboxylation in the link reaction. Krebs' cycle also occurs in mitochondrial matrix.
So the answer is 'i and iii only'.
Question 8
1 / -0

Which is true of glycolysis

A
In aerobic organisms, it is the only process in respiration

B
In this process glucose undergoes complete oxidation to form pyruvic acid

C
Enzyme hexokinase catalyses phosphorylation of glucose to glucose 6-phosphate

D
ATP is utilised in conversion of PEP to pyruvic acid

E
NADH + $$H^+$$ is formed when 1, 3-biphosphoglyceric acid is converted to 3-phosphoglyceric acid

Solution

Glycolysis is the first step in cellular respiration in which glucose is oxidised to form pyruvic acid, a 3 carbon compound which then enters Krebs' cycle for further oxidation. The first step in glycolysis causes phosphorylation of glucose on its 6th carbon, forming glucose 6-phosphate. The reaction is catalysed by enzyme hexokinase.
So the answer is 'Enzyme hexokinase catalyses phosphorylation of glucose to glucose 6-phosphate'.
Question 9
1 / -0

How many six carbon organic acids occur in TCA cycle?

A
1

B
3

C
2

D
4

Solution

TCA cycle starts with the condensation of acetyl group with oxaloacetic acid and water to yield citric acid. It contains 4 six carbon compounds. These are citric acid, cis-aconitic acid, isocitric acid and oxalo-succinic acid.
So the correct option is '4'.
Question 10
1 / -0

Select suitable name for the process
C$$_6$$H$$_{12}$$O$$_6$$ + 2ADP + Pi 2C$$_2$$H$$_5$$OH + CO$$_2$$ + 2ATP

A
Photorespiration.

B
Lactate fermentation.

C
Aerobic respiration.

D
Alcoholic fermentation.

Solution

The given process is alcoholic respiration and is done by the yeast in which two molecules of ATP, carbon dioxide and alcohol is released and the process takes place in the absence of oxygen.
So the correct option is 'Alcoholic fermentation.'

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Respiration in Plants Test - 64

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Respiration in Plants Test - 64

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SHARING IS CARING

Question 1

2

3

4

6

Solution

Question 2

2 + 2

3 + 3

4 + 4

6 + 6

Solution

Question 3

Citric acid and succinic acid

Citric acid and oxaloacetic acid

Acetyl CoA and succinyl CoA

Oxaloacetic acid and oxalosuccinic acid

Solution

Question 4

Glycolysis.

ETC.

Gluconeogenesis.

Krebs cycle.

Solution

Question 5

Embden

Emerson

Krebs

Calvin

Solution

Question 6

Formaldehyde

Acetate

Isocitrate

Citrate

Solution

Question 7

i and ii only

ii and iii only

iii and iv only

i and iii only

i and iv only

Solution

Question 8

In aerobic organisms, it is the only process in respiration

In this process glucose undergoes complete oxidation to form pyruvic acid

Enzyme hexokinase catalyses phosphorylation of glucose to glucose 6-phosphate

ATP is utilised in conversion of PEP to pyruvic acid

NADH + $$H^+$$ is formed when 1, 3-biphosphoglyceric acid is converted to 3-phosphoglyceric acid

Solution

Question 9

1

3

2

4

Solution

Question 10

Photorespiration.

Lactate fermentation.

Aerobic respiration.

Alcoholic fermentation.

Solution

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