Plant Physiology – Respiration in Plants Quiz - ICSE Class 11 Biology

Free practice quiz: Plant Physiology – Respiration in Plants (ICSE Class 11 Biology). 45 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 11 Biology practice quiz has 45 multiple-choice questions on Plant Physiology – Respiration in Plants, and 45 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is the terminal electron acceptor in aerobic respiration?

   1. Oxygen
   2. Water
   3. Carbon dioxide
   4. Pyruvic acid
   Show answer

   Answer: A. Oxygen

   In aerobic respiration, oxygen acts as the final electron acceptor, combining with electrons and protons to form water. This is a crucial step in the electron transport chain.

2. What is the role of NAD+ in cellular respiration?

   1. It is a product of electron transfer
   2. It acts as a terminal electron acceptor
   3. It accepts electrons and hydrogen ions during oxidation reactions
   4. It is consumed during glycolysis
   Show answer

   Answer: C. It accepts electrons and hydrogen ions during oxidation reactions

   NAD+ is a crucial electron carrier. It gets reduced to NADH by accepting electrons and protons during oxidation reactions in glycolysis, the transition step, and the Krebs cycle.

3. When carbohydrates are respired, the typical RQ value is:

   1. Less than 1
   2. Equal to 1
   3. Greater than 1
   4. Zero
   Show answer

   Answer: B. Equal to 1

   For carbohydrates, the overall equation of respiration (e.g., C6H12O6 + 6O2 -> 6CO2 + 6H2O) shows an equal volume of CO2 produced and O2 consumed, resulting in an RQ of 1.

4. The enzyme responsible for the final step of the Krebs cycle, regenerating oxaloacetate, is:

   1. Succinyl-CoA synthetase
   2. Fumarase
   3. Malate dehydrogenase
   4. Citrate synthase
   Show answer

   Answer: C. Malate dehydrogenase

   Malate dehydrogenase oxidizes malate to oxaloacetate, regenerating NAD+ and completing the cycle.

5. The net yield of ATP from glycolysis per molecule of glucose is:

   1. 2 ATP
   2. 4 ATP
   3. 8 ATP
   4. 10 ATP
   Show answer

   Answer: A. 2 ATP

   Glycolysis involves an energy investment phase (2 ATP consumed) and an energy payoff phase (4 ATP produced), resulting in a net gain of 2 ATP molecules.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The net production of ATP per glucose molecule during anaerobic respiration in plants is typically:
2. The EMP pathway, also known as glycolysis, occurs in which cellular compartment?
3. Which enzyme is crucial for the conversion of pyruvate to acetyl-CoA during the transition step of aerobic respiration?
4. The Krebs cycle (Citric Acid Cycle) takes place in which part of the plant cell?
5. Which of the following molecules is NOT a direct product of the Krebs cycle?
6. The electron transport chain, where the majority of ATP is generated during aerobic respiration, is located on which membrane?
7. The process of chemiosmosis is directly responsible for:
8. Under anaerobic conditions, yeast cells in plants can carry out fermentation to produce:
9. The complete oxidation of one molecule of glucose through aerobic respiration yields approximately how many molecules of ATP?
10. Which metabolic pathway generates the most reducing power (NADH and FADH2) per molecule of glucose?
11. The process by which oxygen is consumed and carbon dioxide is released is known as:
12. Which molecule serves as the primary respiratory substrate in plants?
13. The 'Pasteur Effect' in biological systems refers to:
14. Which of the following is NOT a characteristic of anaerobic respiration in plants?
15. During aerobic respiration, the proton motive force across the inner mitochondrial membrane is primarily established by:
16. The 'Respiratory Quotient' (RQ) is defined as the ratio:
17. What is the primary function of ATP synthase during oxidative phosphorylation?
18. Which phase of aerobic respiration produces the most reduced coenzymes (NADH and FADH2)?
19. The process of photophosphorylation in photosynthesis is analogous to which process in cellular respiration?
20. In plants, alternative oxidase pathways (AOX) are involved in:
21. Which of the following statements about the regulation of cellular respiration is INCORRECT?
22. The pentose phosphate pathway (PPP) primarily functions in plants to:
23. The process of converting citrate back to oxaloacetate and succinate in the glyoxylate cycle occurs in:
24. What is the role of cytochromes in the electron transport chain?
25. Which of the following statements best describes the relationship between photosynthesis and respiration in plants?
26. The net gain of ATP molecules from the Krebs cycle per molecule of acetyl-CoA is:
27. Which cellular process is responsible for the majority of ATP production in plants under aerobic conditions?
28. The molecule that directly feeds into the electron transport chain, carrying high-energy electrons derived from glucose breakdown, is:
29. What happens to pyruvic acid in the absence of oxygen in plant cells capable of fermentation?
30. The enzyme ATP synthase utilizes the energy from the proton gradient to phosphorylate:
31. Which of the following factors can DECREASE the rate of respiration in plants?
32. The 'uncouplers' of oxidative phosphorylation, such as dinitrophenol (DNP), disrupt ATP synthesis by:
33. Which enzyme catalyzes the formation of ATP by substrate-level phosphorylation in the Krebs cycle?
34. The conversion of phosphoenolpyruvate to pyruvate in glycolysis produces ATP via:
35. Plants respire at night even in the absence of light. Why?
36. Which of the following is a product of the conversion of pyruvate to acetyl-CoA?
37. The proton gradient established across the inner mitochondrial membrane is a form of:
38. Which stage of aerobic respiration is most sensitive to cyanide poisoning, which inhibits the final electron acceptor?
39. The role of FADH2 in cellular respiration is to:
40. The overall process of cellular respiration can be summarized by which equation?

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