Respiration in Plants Test

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Respiration in Plants Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Function of the enzyme aconitase in Krebs cycle is

A
Citrate $$\underrightarrow { \quad \quad Aconitase,\quad { Fe }^{ 2+ }\quad \quad } $$ Cis aconitate

B
Cis aconitate $$\underrightarrow { \quad \quad Aconitase \quad \quad } $$ Isocitrate

C
Both (A) and (B)

D
None of the above

Solution

The enzyme aconitase carries out the dehydration of citric acid to form cis aconitate which further undergoes hydration to give rise to isocitrate in the presence of same enzyme.
Question 2
1 / -0

Which one is product of aerobic respiration?

A
Malic acid

B
Ethyl alcohol

C
Lactic acid

D
Pyruvic acid

Solution

Malic acid is one of the intermediate of Kreb cycle which is the second stage of aerobic respiration. Dehydrogenation of succinate into fumarate is catalyzed by succinate dehydrogenase; fumarate then undergoes hydration reaction to form malic acid. Fermentation (anaerobic respiration) is incomplete oxidation of food substances into alcohol and lactic acid with a small amount of energy being released. Glycolysis is the first stage of cellular respiration that breaks down one molecule of glucose into two molecules of pyruvic acids; it does not require oxygen and is common to both aerobic and anaerobic respiration. Thus, the correct answer is option A.
Question 3
1 / -0

Krebs cycle takes place in the

A
Mitochondrial matrix.

B
Cytoplasm.

C
Lysosome.

D
Nucleus.

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 4
1 / -0

Synthesis of one glucose molecule requires ___________ reduced NADP molecules.

A
$$6$$

B
$$12$$

C
$$18$$

D
$$24$$

Solution

For every three molecules of $$CO_2$$ that enters the Calvin cycle, one molecule of the three carbon glyceraldehyde 3-phosphate (G3P) is produced. Two molecules of G-3-P are needed to produce one molecule of glucose. Therefore, the Calvin cycle needs to make a total of 6 turns to produce two molecules of G-3-P. One turn of the Calvin cycle requires 3 molecules of ATP and 2 molecules of NADPH so for 6 turns-
3 ATP x 6 = 18 ATPs
2 NADPH x 6 = 12 NADPHs
Question 5
1 / -0

Identify the correct pair of statements.
I) Niacin containing coenzyme facilitates the oxidation of malate in the matrix of mitochondria.
II) Heme is the prosthetic group for the enzyme which catalyses the carboxylation of RuBP in the stroma of chloroplast.
III) The electron carrier between cytochrome C reductase and cytochrome C oxidase is attached to the inner surface of inner membrane of mitochondria.
IV) Water splitting reaction in the lumen of thylakoid requires chlorine.

A
I, II

B
I, IV

C
II, III

D
III, IV

Solution

Nicotinic acid or niacin is the vitamin which is part of the chemical structure of the coenzymes NAD and NADP. The NAD/NADP-dependent enzymes are involved in oxidation-reduction reactions in energy production. NAD acts as a coenzyme required for the oxidation of malate, which occurs in the matrix of mitochondria. Photolysis of water takes place in the lumen of the thylakoid. The photolysis or splitting of water occurs in order to fulfill the gap created in the photosystem. Chloride ions are required for the water-splitting reaction of photosynthesis through which oxygen is produced. So, the correct answer is option B.
Question 6
1 / -0

The first stable compound formed in Krebs cycle is

A
Acetyl Co-A.

B
Citric acid.

C
Oxaloacetic acid.

D
Fumaric acid.

Solution

The citric acid cycle, also known as the tricarboxylic acid cycle (TCA cycle) or the Krebs cycle begins with acetyl CoA transferring its two carbon acetyl group to the four carbon acceptor compound (oxalo acetate) to form a six-carbon compound (citrate).
Question 7
1 / -0

Which of the following statement is not associated with the Kreb's cycle?

A
The Krebs cycle occurs in the matrix of the mitochondrion.

B
The Krebs cycle is linked to glycolysis by pyruvate.

C
The Krebs cycle is the single greatest direct source of ATP in the cell.

D
Citrate is an intermediate in the Krebs cycle.

E
The Krebs cycle produces nucleotides such as NADH and $$FADH_2$$.
Question 8
1 / -0

During lactic acid fermentation

A
$${O}_{2}$$ is used, $$C{O}_{2}$$ is not liberated.

B
$${O}_{2}$$ is not used, $$C{O}_{2}$$ is liberated.

C
$${O}_{2}$$ is used, $$C{O}_{2}$$ is liberated.

D
Neither $${O}_{2}$$ is used, nor $$C{O}_{2}$$ is liberated.

Solution

Lactic acid fermentation takes place under anaerobic conditions. During lactic acid fermentation in cells, the pyruvate produced during glycolysis is converted to lactic acid by oxidizing an electron carrier. when there is insufficient oxygen present in the cell, the pyruvate cannot enter the citric acid cycle, and the NADH cannot be sent to the electron transport chain. Usually such conditions occur during periods of intense physical activity, when the oxygen supply to muscle tissue does not meet the actual requirements of the tissue. In such cases, the pyruvate is fermented to lactic acid by an enzyme called lactate dehydrogenase. The reduction reaction that converts pyruvate to lactic acid in turn oxidizes the NADH to $$NAD^+$$, which re-enters the glycolysis cycle. This process, which takes place under anaerobic conditions, is called lactic acid fermentation.
Question 9
1 / -0

What is the role of FADH$${_2}$$ and NADH in cellular respiration?

A
Catalyze the breakdown of glucose to three carbon sugars

B
Carry electrons to the cytochrome membrane proteins

C
Catalyzes the addition of a phosphate group to ADP

D
Act as a final electron acceptor in the electron transport chain

E
Transport hydrogen ions across the inner mitochondrial membrane

Solution

Several different molecules carry high-energy electrons to the electron transport chain to generate ATP molecules. The NADH and FADH2 molecules are affixed with electrons and are transferred to the inner membrane of the mitochondria. They travel down the electron transport chain composed of protein complexes, releasing the electrons that they once had. The end result is loads of energy in the form of ATP.
Thus, the correct answer is option 'Carry electrons to the cytochrome membrane proteins'.
Question 10
1 / -0

ATP is produced during which of the following processes?
I. Photosynthesis
II. Aerobic respiration
III. Fermentation

A
I only

B
II only

C
I and III only

D
II and III only

E
I, II and III

Solution

ATP is produced during photosynthesis, aerobic respiration and fermentation. During photosynthesis ATP is produced in photophosphorylation. In aerobic respiration 38 ATP molecules are produced while in fermentation or anaerobic respiration 2 ATP molecules are produced.

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Respiration in Plants Test - 45

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Respiration in Plants Test - 45

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SHARING IS CARING

Question 1

Citrate $$\underrightarrow { \quad \quad Aconitase,\quad { Fe }^{ 2+ }\quad \quad } $$ Cis aconitate

Cis aconitate $$\underrightarrow { \quad \quad Aconitase \quad \quad } $$ Isocitrate

Both (A) and (B)

None of the above

Solution

Question 2

Malic acid

Ethyl alcohol

Lactic acid

Pyruvic acid

Solution

Question 3

Mitochondrial matrix.

Cytoplasm.

Lysosome.

Nucleus.

Solution

Question 4

$$6$$

$$12$$

$$18$$

$$24$$

Solution

Question 5

I, II

I, IV

II, III

III, IV

Solution

Question 6

Acetyl Co-A.

Citric acid.

Oxaloacetic acid.

Fumaric acid.

Solution

Question 7

The Krebs cycle occurs in the matrix of the mitochondrion.

The Krebs cycle is linked to glycolysis by pyruvate.

The Krebs cycle is the single greatest direct source of ATP in the cell.

Citrate is an intermediate in the Krebs cycle.

The Krebs cycle produces nucleotides such as NADH and $$FADH_2$$.

Question 8

$${O}_{2}$$ is used, $$C{O}_{2}$$ is not liberated.

$${O}_{2}$$ is not used, $$C{O}_{2}$$ is liberated.

$${O}_{2}$$ is used, $$C{O}_{2}$$ is liberated.

Neither $${O}_{2}$$ is used, nor $$C{O}_{2}$$ is liberated.

Solution

Question 9

Catalyze the breakdown of glucose to three carbon sugars

Carry electrons to the cytochrome membrane proteins

Catalyzes the addition of a phosphate group to ADP

Act as a final electron acceptor in the electron transport chain

Transport hydrogen ions across the inner mitochondrial membrane

Solution

Question 10

I only

II only

I and III only

II and III only

I, II and III

Solution

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