Respiration In Plants Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

How many molecules of carbon dioxide are released from one molecule of glucose during aerobic respiration?

2
4
6
8
3

During aerobic respiration, a total of 6 CO₂ molecules are released per glucose molecule, two from pyruvate oxidation and four from the Krebs cycle.

Which of the following is INCORRECT about the Krebs cycle?

It takes place in the mitochondrial matrix.
It produces NADH and FADH₂.
Glucose enters the Krebs cycle directly.
CO₂ is released during the cycle.
3

Glucose does not directly enter the Krebs cycle; it is first converted into pyruvate and then Acetyl-CoA.

Which molecule is the primary substrate for cellular respiration?

Protein
Lipid
Glucose
Nucleic Acid
3

Glucose is the primary substrate for respiration, undergoing glycolysis to produce ATP.

Which enzyme catalyzes the first irreversible step in glycolysis?

Hexokinase
Aldolase
Enolase
Pyruvate kinase
1

Hexokinase catalyzes the phosphorylation of glucose to glucose-6-phosphate, an irreversible step in glycolysis.

Which molecule acts as the final hydrogen acceptor in aerobic respiration?

NAD⁺
FADH₂
Oxygen
Water
3

Oxygen acts as the final hydrogen acceptor in aerobic respiration, combining with electrons and protons to form water.

Which of the following statements about ATP is CORRECT?

ATP is an energy-storing molecule.
ATP is a protein enzyme.
ATP is only produced during glycolysis.
ATP is not involved in active transport.
1

ATP (Adenosine Triphosphate) is the primary energy currency of the cell.

Which step of respiration takes place in the cytoplasm of a cell?

Glycolysis
Krebs’ cycle
Electron Transport System
Oxidative Phosphorylation
1

Glycolysis occurs in the cytoplasm and leads to the breakdown of glucose into pyruvate.

Which of the following statements about fermentation is INCORRECT?

It occurs in the absence of oxygen.
It takes place in the mitochondria.
It produces ethanol or lactic acid.
It generates much less ATP than aerobic respiration.
2

Fermentation occurs in the cytoplasm, not in the mitochondria.

Which pathway is also known as the EMP pathway?

Krebs cycle
Electron Transport Chain
Glycolysis
Oxidative Phosphorylation
3

Glycolysis is also known as the Embden-Meyerhof-Parnas (EMP) pathway, where glucose is broken down into pyruvate.

Which of the following molecules is the first stable compound formed in the Krebs cycle?

Succinic acid
Fumaric acid
Citric acid
Malic acid
3

Citric acid is the first stable compound formed when Acetyl-CoA combines with oxaloacetic acid in the Krebs cycle.

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