Respiration in Plants
Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is the primary site for aerobic respiration in plants?

Chloroplast
Mitochondria
Cytoplasm
Vacuole
2

Mitochondria are the primary site for aerobic respiration where pyruvic acid is completely oxidized to CO₂ and H₂O, releasing ATP.

Which process releases the highest number of ATP molecules per glucose molecule?

Glycolysis
Fermentation
Krebs cycle
Electron Transport Chain
4

The Electron Transport Chain produces the highest number of ATP molecules, making it the most efficient step in aerobic respiration.

Which of the following is NOT a characteristic of aerobic respiration?

Complete oxidation of glucose
Formation of water and carbon dioxide
Occurs only in prokaryotic cells
Involves the Electron Transport Chain
3

Aerobic respiration occurs in both prokaryotic and eukaryotic cells, though in prokaryotes it takes place in the plasma membrane instead of mitochondria.

Which step in respiration generates FADH₂?

Glycolysis
Krebs cycle
Electron Transport Chain
Fermentation
2

The Krebs cycle generates FADH₂, which later donates electrons to the Electron Transport Chain.

Which of the following statements about respiration in plants is CORRECT?

Plants have specialized respiratory organs like animals.
Gaseous exchange in plants occurs through stomata and lenticels.
Only green parts of plants carry out respiration.
Respiration in plants occurs only at night.
2

Plants do not have specialized respiratory organs; they exchange gases through stomata and lenticels.

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 of the following is a key feature of the respiratory pathway?

It is exclusively anabolic
It is exclusively catabolic
It is an amphibolic pathway
It occurs only in the presence of light
3

The respiratory pathway is amphibolic as it involves both catabolism (breakdown) and anabolism (synthesis).

What is the main function of ATP in respiration?

Acts as an electron carrier
Stores and supplies energy
Breaks down glucose
Transports carbon dioxide
2

ATP (Adenosine Triphosphate) stores energy released during respiration and supplies it for cellular functions.

Which of the following is NOT a product of the Krebs cycle?

ATP
NADH
FADH₂
Oxygen
4

Oxygen is not produced in the Krebs cycle; it is used in the Electron Transport Chain as the final electron acceptor.

Which enzyme is responsible for the phosphorylation of ADP to ATP in mitochondria?

ATP synthase
Hexokinase
Pyruvate kinase
Phosphofructokinase
1

ATP synthase catalyzes the formation of ATP from ADP and inorganic phosphate using the proton gradient.

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