Respiration in Plants Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following intermediates of respiration is involved in amino acid synthesis?

Pyruvate
Citrate
α-Ketoglutaric acid
Fumarate
3

α-Ketoglutaric acid is an intermediate of the Krebs cycle that serves as a precursor for amino acid synthesis.

What is the final electron acceptor in the electron transport system of respiration?

Carbon dioxide
NADH
Oxygen
Water
3

Oxygen acts as the final electron acceptor in the electron transport system, combining with hydrogen to form water.

Which enzyme catalyzes the conversion of fumaric acid to malic acid in the Krebs cycle?

Fumarase
Succinate dehydrogenase
Aconitase
Malate dehydrogenase
1

Fumarase catalyzes the hydration of fumaric acid to form malic acid in the Krebs cycle.

Which of the following statements about ATP is CORRECT?

ATP is an energy-storing molecule.
ATP is only produced during glycolysis.
ATP is a structural component of DNA.
ATP does not participate in cellular processes.
1

ATP (Adenosine Triphosphate) is the main energy-storing molecule in cells, used for various cellular processes.

Which of the following statements about aerobic respiration is INCORRECT?

It requires oxygen
It produces ATP
It occurs in the cytoplasm only
It involves the Electron Transport Chain
3

Aerobic respiration occurs in both the cytoplasm (glycolysis) and mitochondria (Krebs cycle and Electron Transport Chain), not just the cytoplasm.

What is the net ATP gain from one molecule of glucose in aerobic respiration?

2 ATP
4 ATP
38 ATP
32 ATP
3

Aerobic respiration produces a net gain of 38 ATP molecules per glucose molecule.

Which of the following statements about the Electron Transport Chain (ETC) is CORRECT?

ETC occurs in the cytoplasm.
Oxygen is the final electron acceptor in the ETC.
ETC generates ATP through substrate-level phosphorylation.
ETC does not involve a proton gradient.
2

Oxygen serves as the final electron acceptor in the Electron Transport Chain, forming water.

In plants, the majority of ATP is generated during which stage of respiration?

Glycolysis
Krebs cycle
Electron Transport Chain
Fermentation
3

The Electron Transport Chain produces the highest amount of ATP by oxidative phosphorylation.

Which of the following is INCORRECT about the Electron Transport Chain (ETC)?

It takes place in the inner mitochondrial membrane.
Oxygen is the final electron acceptor.
It generates ATP through substrate-level phosphorylation.
It creates a proton gradient across the membrane.
3

The Electron Transport Chain generates ATP through oxidative phosphorylation, not substrate-level phosphorylation.

How many molecules of ATP are directly synthesized in one turn of the Krebs cycle?

1
2
3
4
1

One molecule of ATP (or GTP) is directly synthesized per turn of the Krebs cycle through substrate-level phosphorylation.

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