Respiration in Plants Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which process in respiration produces the highest number of NADH molecules?

Glycolysis
Krebs cycle
Fermentation
Electron Transport Chain
2

The Krebs cycle generates the most NADH molecules, with a total of 6 NADH per glucose molecule.

Which intermediate of the Krebs cycle is involved in the synthesis of amino acids?

Citric acid
α-Ketoglutaric acid
Succinic acid
Fumaric acid
2

α-Ketoglutaric acid is a key intermediate in the Krebs cycle that serves as a precursor for amino acid biosynthesis.

Which of the following is CORRECT about substrate-level phosphorylation?

It requires the Electron Transport Chain.
It occurs in glycolysis and the Krebs cycle.
It takes place in the inner mitochondrial membrane.
It produces more ATP than oxidative phosphorylation.
2

Substrate-level phosphorylation occurs in glycolysis and the Krebs cycle, generating ATP without the Electron Transport Chain.

Which enzyme is responsible for splitting fructose-1,6-bisphosphate into two three-carbon molecules during glycolysis?

Hexokinase
Aldolase
Phosphofructokinase
Enolase
2

Aldolase catalyzes the cleavage of fructose-1,6-bisphosphate into glyceraldehyde-3-phosphate and dihydroxyacetone phosphate.

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

It occurs in the cytoplasm.
It generates ATP through substrate-level phosphorylation.
Oxygen is the final electron acceptor.
It does not involve a proton gradient.
3

Oxygen serves as the final electron acceptor in the Electron Transport Chain, combining with protons to form water.

Which of the following statements about fermentation is CORRECT?

It takes place in the mitochondria.
It produces more ATP than aerobic respiration.
It occurs under anaerobic conditions.
Oxygen is required for fermentation to proceed.
3

Fermentation occurs in the absence of oxygen (anaerobic conditions).

During which step of aerobic respiration is CO₂ first released?

Glycolysis
Krebs cycle
Oxidation of pyruvate
Electron Transport Chain
3

CO₂ is first released during the oxidation of pyruvate to Acetyl-CoA before entering the Krebs cycle.

Which of the following statements about the respiratory quotient (RQ) is correct?

RQ for carbohydrates is greater than 1
RQ for proteins is exactly 1
RQ for fats is less than 1
RQ for all substrates is always the same
3

The RQ for fats is less than 1 because more oxygen is consumed compared to the amount of carbon dioxide produced.

Which of the following is CORRECT about aerobic respiration?

It requires oxygen.
It occurs only in prokaryotic cells.
It does not involve the Electron Transport Chain.
It produces less ATP than anaerobic respiration.
1

Aerobic respiration requires oxygen and produces more ATP compared to anaerobic respiration.

Which compound is formed when oxygen acts as the final electron acceptor in respiration?

Carbon dioxide
Water
ATP
NADH
2

Oxygen combines with hydrogen ions and electrons at the end of the Electron Transport Chain to form water.

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