Respiration in Plants Test

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Respiration in Plants Test - 66

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Question 1
1 / -0

Which of the two statements together support that respiratory pathway is an amphibolic pathway.
i) Fats breakdown to glycerol and fatty acids, subsequently yields acetyl CoA
ii) In respiration C-C bonds of complex compounds breakdown through oxidation leading to release of energy
iii) Acetyl CoA from respiratory pathway is withdrawn for synthesis of fatty acids
iv) Proteins are degraded by protease to amino acids and enter the respiratory pathway

A
i, ii

B
i, iv

C
ii, iv

D
ii, iii
Question 2
1 / -0

Three major ways for metabolism of pyruvic acid produced in glycolysis are

A
Lactic acid fermentation, alcoholic fermentation and aerobic respiration.

B
Oxaloacetic acid fermentation, lactic acid fermentation, aerobic fermentation.

C
Alcoholic fermentation, oxaloacetic acid fermentation, citric acid fermentation.

D
Citric acid fermentation, lactic acid fermentation, alcoholic fermentation.

Solution

Glycolysis the common pathway of lactic acid fermentation, alcoholic fermentation and aerobic respiration in which glucose is converted into pyruvic acid in a multi-step reaction which includes ten major steps involve various enzymes.
So the correct option is 'Lactic acid fermentation, alcoholic fermentation and aerobic respiration.'
Question 3
1 / -0

Which one is important in electron transport system?

A
Ubiquinone

B
Acetyl CoA

C
Tricarboxylic acid

D
Ferricyanide

Solution

Ubiquinone is an organic molecule (not a protein) dissolved in the hydrophobic region of the inner membrane of the mitochondrion. Both complexes I and complex II pass their electrons to a small, mobile electron carrier called ubiquinone $$Q$$. Reduction takes place to form $$QH_2$$ and it delivers electrons to complex III.
Question 4
1 / -0

Some desert beetles can survive on metabolic water without ever drinking liquid water which

A
Was produced as water in the organisms they eat

B
Is a breakdown product of pyruvate inside the mitochondria alongwith $$CO_2$$

C
Is a breakdown product from glycolysis in the cytoplasm

D
Is absorbed from the air along with respiratory oxygen
Question 5
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Maximum energy is liberated on respiratory breakdown of

A
Protein

B
Fat

C
Carbohydrate

D
Nucleic acid

Solution

B. Fat.
Solution: Fat contains more energy than carbohydrates and proteins. it is composed of fatty acids and glycerol. The body needs fats for growth and energy. In oxidation, fats releases 9cal/gm of fat.
So, the correct answer is (B).
Question 6
1 / -0

Compensation point is the value of a factor where there is

A
Beginning of photosynthesis

B
Little photosynthesis

C
Photosynthesis equal to rate of respiration

D
Neither photosynthesis nor respiration

Solution

Compensation point is the value of a factor where the rate of photosynthesis is equal to the rate of respiration. At this point, carbon dioxide released from respiration is equivalent to that which is taken up during photosynthesis. When the light intensity increases, the compensation point is reached. When light intensity is increased beyond the compensation point, the rate of photosynthesis increases proportionally until the point of light saturation is reached. Beyond light saturation point, the rate of photosynthesis is no longer affected by light intensity. Compensation point varies in different species of plants. It even varies in response to changes in temperature and other environmental factors.
Question 7
1 / -0

In glycolysis during which reaction, water molecule is released

A
2-phosphoglyceric acid phosphoenol pyruvic acid

B
PGAL 3 PGA

C
1, 3-biphosphoglyceric acid Phosphoglyceric acid

D
Phosphoenol pyruvic acid Pyruvic acid

Solution

In glycolysis, when 2-phosphoglyceric acid is acted upon by enolase enzyme to form phosphoenol pyruvic acid, H2O is released. So the answer is '2-phosphoglyceric acid phosphoenol pyruvic acid'.
Question 8
1 / -0

Arrange the following compounds formed in respiration based on their C-atoms
i) Pyruvic acid
ii) -Ketoglutaric acid
iii) Citric acid
iv) Malic acid

A
iv, i, ii, ii

B
ii, iv, ii, iii

C
i, ii, iv, iii

D
i, iv, iii, ii

Solution

The correct order for the given compounds based on their C atoms would be:
pyruvic acid (3C), malic acid (4 C), ketoglutaric acid (5 C), citric acid (6 C).
So the answer is 'i,iv,ii,iii'.
Question 9
1 / -0

During respiration

A
$$PGAL$$ is not produced during respiratory events

B
$$2\ PGAL$$ during glycolysis and $$4$$ pyruvic acid are produced in Krebs' cycle

C
$$2\ PGAL$$ during glycolysis and $$2$$ pyruvic acid are produced in Krebs' cycle

D
$$2\ PGAL$$ during glycolysis and none of the $$PGAL$$ produced in Krebs' cycle

Solution

During respiration 2 molecules of glyceraldehyde 3- phosphate (PGAL) are formed in glycolysis, but no such compound is formed in TCA or Krebs' cycle.
Question 10
1 / -0

In which of the following reduction of NAD does not occur?

A
Isocitric acid $$\to$$ $$\alpha$$-ketoglutaric acid

B
Malic acid $$\to$$ oxaloacetic acid

C
Pyruvic acid $$\to$$ acetyl coenzyme

D
Succinic acid $$\to$$ fumaric acid

Solution

The conversion of succinic acid to fumaric acid is one of the steps in the Krebs cycle. The conversion is catalyzed by the enzyme succinic dehydrogenase and $$FAD$$ is reduced to $$FADH_2$$. Thus the correct answer is option D.

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Respiration in Plants Test - 66

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Respiration in Plants Test - 66

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SHARING IS CARING

Question 1

i, ii

i, iv

ii, iv

ii, iii

Question 2

Lactic acid fermentation, alcoholic fermentation and aerobic respiration.

Oxaloacetic acid fermentation, lactic acid fermentation, aerobic fermentation.

Alcoholic fermentation, oxaloacetic acid fermentation, citric acid fermentation.

Citric acid fermentation, lactic acid fermentation, alcoholic fermentation.

Solution

Question 3

Ubiquinone

Acetyl CoA

Tricarboxylic acid

Ferricyanide

Solution

Question 4

Was produced as water in the organisms they eat

Is a breakdown product of pyruvate inside the mitochondria alongwith $$CO_2$$

Is a breakdown product from glycolysis in the cytoplasm

Is absorbed from the air along with respiratory oxygen

Question 5

Protein

Fat

Carbohydrate

Nucleic acid

Solution

Question 6

Beginning of photosynthesis

Little photosynthesis

Photosynthesis equal to rate of respiration

Neither photosynthesis nor respiration

Solution

Question 7

2-phosphoglyceric acid phosphoenol pyruvic acid

PGAL 3 PGA

1, 3-biphosphoglyceric acid Phosphoglyceric acid

Phosphoenol pyruvic acid Pyruvic acid

Solution

Question 8

iv, i, ii, ii

ii, iv, ii, iii

i, ii, iv, iii

i, iv, iii, ii

Solution

Question 9

$$PGAL$$ is not produced during respiratory events

$$2\ PGAL$$ during glycolysis and $$4$$ pyruvic acid are produced in Krebs' cycle

$$2\ PGAL$$ during glycolysis and $$2$$ pyruvic acid are produced in Krebs' cycle

$$2\ PGAL$$ during glycolysis and none of the $$PGAL$$ produced in Krebs' cycle

Solution

Question 10

Isocitric acid $$\to$$ $$\alpha$$-ketoglutaric acid

Malic acid $$\to$$ oxaloacetic acid

Pyruvic acid $$\to$$ acetyl coenzyme

Succinic acid $$\to$$ fumaric acid

Solution

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