Respiration in Plants Test

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Respiration in Plants Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

In respiration, pyruvic acid is

A
Formed only when oxygen is available

B
One of the product of Krebs cycle

C
Broken down into two carbon fragments and $$CO_{2}$$

D
None of the above
Solution
Correct Option: C
Explanation:
- In the process of respiration, pyruvic acid is broken down into carbon fragments and $$CO_2$$.
- Pyruvic acid in aerobic respiration is broken down slowly in a complex chain of events, called the Krebs cycle.
- During this cycle, 34 more ATP molecules are produced.
- Before entering into the Krebs cycle, one pyruvate is broken down into two acetyl-CoA and one carbon dioxide is released.
  Hence, in respiration pyruvic acid is broken down into two molecules of Carbon Dioxide.
Question 2
1 / -0

Mitochondria is the site of

A
$$CO_{2}$$ uptake in photosynthesis

B
$$O_{2}$$ uptake during respiration

C
The release of energy during respiration

D
Cell division

Solution

Electron trasnport chain is present in inner mitochondrial membrane and passes the electrons down a series of carriers and pump protons into the intermembrane space. Oxygen serves as final electron acceptor and the resulting proton gradient serves as energy source for the enzyme ATP synthase to synthesize ATP. Stomata are site of uptake of corbon dioxide and oxygen gases. Correct answer is C.
Question 3
1 / -0

ATP synthesis occurs on the

A
Outer membrane of mitochondrion

B
Inner membrane of mitochondrion

C
Matrix

D
None of the above

Solution

ATP synthesis occurs on the inner membranes of the mitochondrion. The energy released during respiration is conserved as ATP. Most ATPs are synthesised in the inner mitochondrion during the electron transport system.
Question 4
1 / -0

The reaction of Krebs cycle take place

A
In cytoplasm

B
In endoplasmic reticulum

C
In matrix of mitochondria

D
On the surface of mitochondrion

Solution

The Krebs cycle is a part of cellular respiration. The Krebs cycle comes after the link reaction and provides the hydrogen and electrons needed for the electron transport chain. It takes place inside the matrix of mitochondria.
Question 5
1 / -0

Largest amount of phosphate bound energy is produced in the process of respiration during

A
Anaerobic respiration

B
Glycolysis

C
Krebs cycle

D
Link reaction

Solution

During the process of glycolysis 8 ATP molecules are produced in aerobic respiration. In the case of Krebs cycle 30 ATP molecules can be produced.
Question 6
1 / -0

Match the column and choose the appropriate match.
List I List II
A 4C Compound 1 Acetyl Co-A
B 2C Compound 2 Pyruvate
C 5C Compound 3 Citric acid
D 3C Compound 4 $$\alpha -$$keto glutaric acid
5 Malic acid

A
A- 5, B- 1, C- 4, D- 2

B
A - 5, B- 4, C- 1, D- 2

C
A- 1, B- 5, C- 4, D- 2

D
A- 5, B- 1, C- 2, D- 4

Solution

Two molecules of pyruvic acid formed from one glucose molecule during glycolysis undergo the formation of Acetyl CoA, 2$$CO_2$$ and $$2NADH + 2H^+$$. Pyruvic acid or pyruvate is a 3C compound and Acetyl CoA is a 2C compound.
$$Pyruvic acid + CoA + NAD^+ \xrightarrow[Pyruvate dehydrogenase]{Mg^2+}Acetyl CoA + CO_2 + NADH + H^+$$
Acetyl CoA enters a cyclic pathway called as Krebs cycle. It starts with condensation of Acetyl group with oxaloacetic acid (OAA) and water to yield citric acid which is a 6C compound.
Citric acid changes to cis-aconitic acid by the action of aconitase. The, cis-aconitic acid changes to isocitrate by the same enzyme. Then, isocitrate is changed into oxalosuccinate (5C) which is converted into $$\alpha$$-ketoglutaric acid. It is a 5C compound.
$$\alpha$$-ketoglutaric acid then converts into 4C compound succinyl CoA. Then, it converts into succinnic acid which later converts into furmaric acid. Malic acid is formed by the action of furmarase on furmaric acid. Malic acid is a 4C compound.
Question 7
1 / -0

Krebs cycle starts with the formation of six carbon compound by reaction between

A
Malic acid and acetyl CoA

B
Succinic acid and pyruvic acid

C
Fumaric acid and pyruvic acid

D
Acetyl CoA and oxaloacetic acid

Solution

Krebs cycle starts with condensation of acetyl-CoA with oxaloacetate (OAA, 4C) to form citrate (6C) and is catalyzed by enzyme citrate synthase. Link reaction of aerobic respiration decarboxylates pyruvic acid into acetyl CoA which in turn enters Krebs's cycle. Malate is dehydrogenated in 8$$^{th}$$ step of the cycle to continue the supply of OAA which in turn then reacts with acetyl-CoA. The correct answer is D.
Question 8
1 / -0

Which one is not correct about Krebs cycle?

A
It is also called citric acid cycle.

B
The intermediate compound which links glycolysis with Krebs cycle is malic acid.

C
It occurs in mitochondria.

D
It start with six carbon compound.

Solution

Krebs cycle is also known as citric acid cycle or TCA. The intermediate compound which links glycolysis with krebs cycle is acetyl CoA. It occurs in mitochondria. It begins with a six carbon compound i.e., citric acid.
Therefore, the correct answer is option B.
Question 9
1 / -0

Krebs cycle involves the

A
Formation of lactic acid from glucose.

B
Change of pyruvic acid to energy transformation.

C
Formation of pyruvic acid from glucose.

D
Formation of ATP from ADP.

Solution

Pyruvic acid is the end product of glycolysis. It serves as the substrate for Krebs cycle. The Krebs cycle is a part of cellular respiration. It is a series of chemical reactions used by all aerobic organisms to generate energy.
Question 10
1 / -0

Which of the following is correct sequence in Krebs cycle?

A
Isocitric acid$$\rightarrow $$Oxalosuccinic acid$$\rightarrow $$ $$\alpha $$-ketoglutaric acid

B
Oxalosuccinic acid $$\rightarrow $$Isocitric acid$$\rightarrow $$ $$\alpha $$-ketoglutaric acid

C
$$\alpha$$ -ketoglutaric acid $$\rightarrow $$Isocitric acid$$\rightarrow $$Oxalosuccinic acid

D
Isocitric acid$$\rightarrow $$ $$\alpha$$ -ketoglutatric acid $$\rightarrow $$ Oxalosuccinic acid

Solution

Citric acid undergoes dehydration to form cis-aconitase which then undergoes hydration reaction to form isocitrate. Oxidative decarboxylation of citric acid into alpha-ketoglutarate catalyzed by Isocitrate dehydrogenase enzyme forms an unstable intermediate oxalosuccinic acid (6C) which immediately undergoes decarboxylation and forms alpha-ketoglutarate. Thus, the correct answer is option A.

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	List I		List II
A	4C Compound	1	Acetyl Co-A
B	2C Compound	2	Pyruvate
C	5C Compound	3	Citric acid
D	3C Compound	4	$$\alpha -$$keto glutaric acid
		5	Malic acid

Respiration in Plants Test - 25

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Respiration in Plants Test - 25

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Question 1

Formed only when oxygen is available

One of the product of Krebs cycle

Broken down into two carbon fragments and $$CO_{2}$$

None of the above

Solution

Question 2

$$CO_{2}$$ uptake in photosynthesis

$$O_{2}$$ uptake during respiration

The release of energy during respiration

Cell division

Solution

Question 3

Outer membrane of mitochondrion

Inner membrane of mitochondrion

Matrix

None of the above

Solution

Question 4

In cytoplasm

In endoplasmic reticulum

In matrix of mitochondria

On the surface of mitochondrion

Solution

Question 5

Anaerobic respiration

Glycolysis

Krebs cycle

Link reaction

Solution

Question 6

A- 5, B- 1, C- 4, D- 2

A - 5, B- 4, C- 1, D- 2

A- 1, B- 5, C- 4, D- 2

A- 5, B- 1, C- 2, D- 4

Solution

Question 7

Malic acid and acetyl CoA

Succinic acid and pyruvic acid

Fumaric acid and pyruvic acid

Acetyl CoA and oxaloacetic acid

Solution

Question 8

It is also called citric acid cycle.

The intermediate compound which links glycolysis with Krebs cycle is malic acid.

It occurs in mitochondria.

It start with six carbon compound.

Solution

Question 9

Formation of lactic acid from glucose.

Change of pyruvic acid to energy transformation.

Formation of pyruvic acid from glucose.

Formation of ATP from ADP.

Solution

Question 10

Isocitric acid$$\rightarrow $$Oxalosuccinic acid$$\rightarrow $$ $$\alpha $$-ketoglutaric acid

Oxalosuccinic acid $$\rightarrow $$Isocitric acid$$\rightarrow $$ $$\alpha $$-ketoglutaric acid

$$\alpha$$ -ketoglutaric acid $$\rightarrow $$Isocitric acid$$\rightarrow $$Oxalosuccinic acid

Isocitric acid$$\rightarrow $$ $$\alpha$$ -ketoglutatric acid $$\rightarrow $$ Oxalosuccinic acid

Solution

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