Respiration in Plants Test

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Respiration in Plants Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

Mitochondria are called the powerhouses of the cell. Which of the following observations support this statement?

A
Mitochondria are found in almost all plant and animal cells.

B
The enzymes of the Krebs cycle and the cytochromes are found in mitochondria.

C
Mitochondria synthesise ATP.

D
Mitochondria have a double membrane.

Solution

Mitochondria (singular - Mitochondrion) are known as the powerhouse of the cell because they are responsible for the release of energy from food ,i.e, cellular respiration. This energy is released in the form of ATP (adenosine triphosphate), the energy currency of the cell.
While the cells release 2 ATP, mitochondria releases 34 ATP which adds up to 36 ATP. Since a major portion of the ATP is released by mitochondria, they are called the powerhouse of the cell.
Question 2
4 / -1

Respiratory substrates are the organic substances which are ________ during respiration to liberate energy.

A
Oxidised

B
Reduced

C
Synthesised

D
Both (a) and (b)

Solution

Respiration is an oxidative process in which repiratory substrates are oxidised to liberate energy inside the living cells. The common respiratory substrates are carbohydrates, proteins, fats and organic acids. The most common respiratory substrates are carbohydrates, proteins, fats and organic acids. The most common respiratory substrate is glucose.
Question 3
4 / -1

The TCA cycle is named after

A
Robert Emerson

B
Melvin Calvin

C
Embden

D
Hans Krebs
Question 4
4 / -1

In which of the following do the two names refer to one and the same thing?

A
Krebs cycle and Calvin cycle

B
Citric acid cycle and Calvin cycle

C
Tricarboxylic acid cycle and citric acid cycle

D
Tricarboxylic acid cycle and urea cycle
Question 5
4 / -1

Pyruvic acid, the key product of glycolysis, can have many metabolic fates. Under aerobic conditions, it forms

A
CO₂

B
CO₂+ H₂O

C
Lactic acid

D
Acetyl CoA + CO₂

Solution

Pyruvate, the product obtained through glycolysis, gets oxidised with the loss of its carboxy group as CO₂, to give acetyl Co-A, under aerobic condition. This acetyl Co-A is further oxidised completely to CO₂ + H₂O in citric acid cycle. Other options are incorrect as Lactic acid is formed in muscles under anaerobic conditions. Ethanol and CO₂are products of anaerobic respiration in yeast cells. CO₂ and H₂O are final and complete reaction products released at the end of cellular respiration.
Question 6
4 / -1

End-product of citric acid/Krebs cycle is

A
Citric acid

B
CO₂ + H₂O

C
Lactic acid

D
Pyruvic acid

Solution

Glycolysis produces 2 pyruvate molecules. The pyruvate molecules then forms acetyl CoA and one molecule of carbon dioxide is released. The acetyl-CoA molecules then enters the citric acid cycle. The end product of citric acid cycle is 2 carbon dioxide molecules, 1 GTP, 3 NADH and 1 FADH_2. Thus, the correct answer is 'Carbon dioxide + Water.'
Question 7
4 / -1

Choose the correct statement.

A
There is a complete breakdown of glucose during fermentation.

B
Pyruvate is formed in the mitochondrial matrix.

C
During the conversion of succinyl CoA to succinic acid, a molecule of ATP is synthesised.

D
Oxygen is vital in respiration for the removal of hydrogen.
Solution
Oxygen sits at the end of the electron transport chain, where it accepts electrons, hydrogen and picks up protons to form water.
Pyruvate is formed in the cytoplasm.
During fermentation glucose is partially broken down by glycolysis.
During the conversion of succinyl CoA to succinic acid a molecule of GTP is synthesized.
So, the correct option is 'Oxygen is vital in respiration for removal of hydrogen'.
Question 8
4 / -1

Which of the following is the key intermediate compound linking glycolysis to the Krebs cycle?

A
ATP

B
Malic acid

C
Acetyl CoA

D
NADH
Question 9
4 / -1

Which of the following is not correct about the Krebs cycle?

A
It starts with a six-carbon compound.

B
It occurs in mitochondria.

C
It is also called the citric acid cycle.

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

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.
Question 10
4 / -1

Most of the enzymes of the TCA cycle are present in

A
Intermembrane space of mitochondria

B
Mitochondrial matrix

C
Inner membrane of mitochondria

D
Cytoplasm

Solution

Mitochondria except succinate dehydrogenase.

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Respiration in Plants Test - 7

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Question 1

Mitochondria are found in almost all plant and animal cells.

The enzymes of the Krebs cycle and the cytochromes are found in mitochondria.

Mitochondria synthesise ATP.

Mitochondria have a double membrane.

Solution

Question 2

Oxidised

Reduced

Synthesised

Both (a) and (b)

Solution

Question 3

Robert Emerson

Melvin Calvin

Embden

Hans Krebs

Question 4

Krebs cycle and Calvin cycle

Citric acid cycle and Calvin cycle

Tricarboxylic acid cycle and citric acid cycle

Tricarboxylic acid cycle and urea cycle

Question 5

CO2

CO2+ H2O

Lactic acid

Acetyl CoA + CO2

Solution

Question 6

Citric acid

CO2 + H2O

Lactic acid

Pyruvic acid

Solution

Question 7

There is a complete breakdown of glucose during fermentation.

Pyruvate is formed in the mitochondrial matrix.

During the conversion of succinyl CoA to succinic acid, a molecule of ATP is synthesised.

Oxygen is vital in respiration for the removal of hydrogen.

Solution

Question 8

ATP

Malic acid

Acetyl CoA

NADH

Question 9

It starts with a six-carbon compound.

It occurs in mitochondria.

It is also called the citric acid cycle.

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

Solution

Question 10

Intermembrane space of mitochondria

Mitochondrial matrix

Inner membrane of mitochondria

Cytoplasm

Solution

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CO₂

CO₂+ H₂O

Acetyl CoA + CO₂

CO₂ + H₂O