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Respiration and Gas Exchange
Quick questions on Aerobic and anaerobic respiration explained: O-Level Biology
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is aerobic respiration?Show answer
Aerobic respiration uses oxygen and releases a large amount of energy from each glucose molecule. It takes place mainly in the mitochondria.
What is anaerobic respiration?Show answer
Anaerobic respiration releases energy from glucose without oxygen. It releases much less energy per glucose than aerobic respiration, because the glucose is not fully broken down.
What is oxygen debt?Show answer
During hard exercise, the muscles cannot get enough oxygen, so they respire anaerobically, producing lactic acid. The extra oxygen needed afterwards to break down this lactic acid is called the oxygen debt. This is why an athlete keeps breathing heavily after sprinting: to take in oxygen to remove the lactic acid and repay the debt.
What is q1?Show answer
Write the word equation for aerobic respiration. [2 marks]
What is q2?Show answer
State the product of anaerobic respiration in human muscle. [1 mark]
What is q3?Show answer
Explain why aerobic respiration releases more energy than anaerobic respiration. [2 marks]
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