Que 1. State two differences between aerobic and Anaerobic respiration.

Ans 1. The two main differences between them are as follows: Aerobic respiration occurs in the presence of oxygen on the other hand, anaerobic respiration takes place in the absence or lack of oxygen The end product of anaerobic respiration is ethanol or lactic acid while in the case of aerobic no such end products are produced

Que 2. How has Aerobic and anaerobic respiration evolved?

Ans 2. The evolution of anaerobic respiration occurs earlier than aerobic respiration because Earth had a much lower oxygen level when the first unicellular organisms developed, almost entirely lacking in oxygen. On the other hand, anaerobic respiration produces only 2 ATP molecules per cycle, enough for unicellular needs but inadequate for multicellular organisms.

Que 3. What is the efficiency of Aerobic respiration approximately?

Ans 3. One glucose stores 686 kcal, One ATP stores 8.1 kcal One glucose yields 38 ATP Efficiency =38×8.1×100/686= 45%

Que 4. Which event is crucial in Aerobic Respiration?

Ans 4. The complete oxidation of pyruvate and the passing of the electrons removed as a part of the hydrogen atoms to molecular oxygen with the simultaneous synthesis of ATP is one of the crucial events of Aerobic respiration.

Que 5. Who discovered the Tricarboxylic acid cycle?

Ans 5. Tricarboxylic acid cycle, more commonly known as Krebs cycle, was discovered by Hans Krebs, who first discovered it in the flight muscles of pigeons.

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