Respiration in Plants Test

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Respiration in Plants Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is/are false?

a. In anaerobic organisms, glycosis is the only process in respiration.
b. Glucose undergoes partial oxidation in glycosis to form two molecules of pyruvic acid.
c. Sucrose is converted into glucose and fructose by the enzyme hexokinase.

A
Only a

B
Only a and b

C
Only b

D
Only c

Solution

This is the correct option as this statement is false. Sucrose is converted into glucose and fructose by the enzyme invertase.
Question 2
1 / -0

Which of the following is not a characteristic property of aerobic respiration?

A
In aerobic respiration, there is a complete oxidation of pyruvate.

B
In aerobic respiration, two molecules of NADH are produced from the metabolism of two molecules of pyruvic acid.

C
NADH is oxidised to NAD⁺ very slowly in aerobic respiration.

D
Glucose is completely degraded to CO₂ and H₂O in aerobic respiration.

Solution

This is the correct option as this is not a characteristic property of aerobic respiration.
NAD⁺ is reduced to NADH in aerobic respiration. Each NADH formed enters ETC and yields 3 ATP molecules.
Question 3
1 / -0

Which of the following substrates would need to be broken down into glycerol and fatty acids first before entering the respiratory pathway?

a. Carbohydrates
b. Fats
c. Proteins

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

Fats would need to be broken down into glycerol and fatty acids first before entering the respiratory pathway.
Question 4
1 / -0

For entry into Krebs cycle, pyruvate formed during glycolysis is converted into

A
acetyl CoA

B
glucose

C
glyceraldehyde phosphate

D
lactic acid

Solution

Acetyl CoA enters Krebs cycle under aerobic conditions.
Question 5
1 / -0

Which of the following statements is/are false?

a. The respiratory quotient depends upon the type of respiratory substrate used during respiration.
b. In oxidative phosphorylation, O₂ is the ultimate acceptor of electrons and it gets reduced to water.
c. The ratio of volume of CO₂ consumed to the volume of O₂ evolved in respiration is called as respiratory quotient.

A
Only a

B
Only a and b

C
Only b

D
Only c
Question 6
1 / -0

Which of the following statements are correct?

(A) The oxidation of pyruvic acid molecules formed in glycolysis occurs inside the mitochondria.
(B) Acetyl COA is a 3-carbon compound.
(C) Under anaerobic conditions, the pyruvic acid formed during glycolysis is reduced to either ethyl alcohol or lactic acid.
(D) Acetyl COA molecules enter into cyclic reactions during Calvin's cycle.

A
(A) and (B)

B
(C) and (D)

C
(A) and (C)

D
(B) and (C)

Solution

Acetyl COA is a 2-carbon compound and 3-phosphoglycerate molecule enter into cyclic reactions during Calvin's cycle.
Question 7
1 / -0

Which of the following reactions are catalysed by the enzyme phosphofructokinase?

A
Fructose - 1, 6 - bisphophate cFructose - 6 - phosphate

B
Glucose - 6 - phosphate →Fructose - 6 - phosphate

C
G - 3 - P →Dihydroxy acetone phosphate

D
Fructose - 6 - phosphate + ATP → Fructose - 1, 6 - bisphosphate

Solution

Phosphofructokinase is a kinase enzyme that phosphorylates fructose 6-phosphate in glycolysis. The enzyme-catalysed transfer of a phosphoryl group from ATP is an important reaction in a wide variety of biological processes.
Question 8
1 / -0

If the CO₂ content of atmosphere is as high as 300 parts per million, then

A
all plants would be killed

B
growth of plants would get stunted

C
the plants would thrive well

D
plants would grow for sometime and then die

Solution

Photosynthesis increases with increase in CO₂.
Question 9
1 / -0

The enzyme fumarase catalyses the reaction

A
succinic acid  → fumartic acid

B
fumaric acid → malic acid

C
malic acid →  oxaloacetic acid

D
succinyl COA →  succinic acid

Solution

Fumarase (or fumarate hydratase) is an enzyme that catalyses the reversible hydration/dehydration reaction of fumarate to malate.

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Respiration in Plants Test - 5

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Respiration in Plants Test - 5

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Question 1

Only a

Only a and b

Only b

Only c

Solution

Question 2

In aerobic respiration, there is a complete oxidation of pyruvate.

In aerobic respiration, two molecules of NADH are produced from the metabolism of two molecules of pyruvic acid.

NADH is oxidised to NAD+ very slowly in aerobic respiration.

Glucose is completely degraded to CO2 and H2O in aerobic respiration.

Solution

Question 3

Only a

Only a and b

Only b

Only b and c

Solution

Question 4

acetyl CoA

glucose

glyceraldehyde phosphate

lactic acid

Solution

Question 5

Only a

Only a and b

Only b

Only c

Question 6

(A) and (B)

(C) and (D)

(A) and (C)

(B) and (C)

Solution

Question 7

Fructose - 1, 6 - bisphophate cFructose - 6 - phosphate

Glucose - 6 - phosphate → Fructose - 6 - phosphate

G - 3 - P → Dihydroxy acetone phosphate

Fructose - 6 - phosphate + ATP → Fructose - 1, 6 - bisphosphate

Solution

Question 8

all plants would be killed

growth of plants would get stunted

the plants would thrive well

plants would grow for sometime and then die

Solution

Question 9

succinic acid → fumartic acid

fumaric acid → malic acid

malic acid → oxaloacetic acid

succinyl COA → succinic acid

Solution

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NADH is oxidised to NAD⁺ very slowly in aerobic respiration.

Glucose is completely degraded to CO₂ and H₂O in aerobic respiration.

Glucose - 6 - phosphate →Fructose - 6 - phosphate

G - 3 - P →Dihydroxy acetone phosphate