Respiration in Plants
Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is the first step of cellular respiration?

Krebs cycle
Glycolysis
Electron Transport Chain
Fermentation
2

Glycolysis is the first step of cellular respiration, occurring in the cytoplasm and leading to the formation of pyruvate.

Which component of the Electron Transport Chain transfers electrons from complex III to complex IV?

Ubiquinone
Cytochrome c
ATP synthase
NADH dehydrogenase
2

Cytochrome c is a mobile electron carrier that transfers electrons from complex III to complex IV in the Electron Transport Chain.

Which part of a plant mainly carries out respiration?

Leaves
Stems
Roots
All living cells
4

All living cells in a plant respire to produce energy, including leaves, stems, and roots.

What is the fate of pyruvate in anaerobic conditions in muscle cells?

Converted to ethanol
Converted to Acetyl-CoA
Converted to lactic acid
Used in the Electron Transport Chain
3

Under anaerobic conditions, pyruvate is converted into lactic acid in muscle cells through lactic acid fermentation.

Which of the following statements about the link reaction is INCORRECT?

It occurs in the mitochondrial matrix.
It converts pyruvate into Acetyl-CoA.
It generates ATP directly.
It produces NADH as a byproduct.
3

The link reaction does not generate ATP directly; it converts pyruvate into Acetyl-CoA for entry into the Krebs cycle.

Which of the following is NOT a step in aerobic respiration?

Glycolysis
Fermentation
Krebs’ cycle
Electron Transport Chain
2

Fermentation occurs in anaerobic respiration, while glycolysis, the Krebs cycle, and the electron transport chain are part of aerobic respiration.

Which molecule is formed at the end of glycolysis?

Acetyl-CoA
Lactic acid
Pyruvic acid
Citric acid
3

Glycolysis produces pyruvic acid, which then enters either fermentation or aerobic respiration.

What is the role of Coenzyme A in cellular respiration?

Acts as the final electron acceptor
Transfers acetyl group to the Krebs cycle
Synthesizes ATP in glycolysis
Acts as an enzyme in the Electron Transport Chain
2

Coenzyme A (CoA) transfers the acetyl group derived from pyruvate into the Krebs cycle, forming Acetyl-CoA.

How many molecules of ATP are produced from one molecule of glucose during fermentation?

2
4
18
38
1

Fermentation yields only 2 ATP molecules per glucose molecule as it does not involve oxidative phosphorylation.

Which of the following statements about glycolysis is INCORRECT?

Glycolysis takes place in the mitochondria.
It involves the breakdown of glucose to pyruvate.
ATP is both utilized and generated in glycolysis.
Glycolysis is a common pathway for both aerobic and anaerobic respiration.
1

Glycolysis occurs in the cytoplasm, not in the mitochondria.

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