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.

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 quizzes

• Plant Physiology – Transport in Plants
• Structural Organisation – Anatomy of Flowering Plants
• Structural Organisation – Morphology of Flowering Plants
• Cell Structure and Function – Cell Cycle & Cell Division
• Cell Structure and Function – Cell Theory & Organelles
• Diversity of Living Organisms – Animal Kingdom

Browse all Biology quizzes