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IGCSE O Level Biology Competitive Exam MCQs – Practice Test 5 (Chapter 15)

Respiration in Biology Multiple Choice Questions and Answers PDF – Test 5

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Respiration in Biology MCQs with Answers PDF Download – Test 5

MCQ 21: Over-breathing is a symptom of:

  1. less oxygen
  2. excess oxygen
  3. excess carbon dioxide
  4. excess carbon monoxide

MCQ 22: Too little carbon dioxide (CO2) in lungs leads to:

  1. no breathing
  2. over breathing
  3. under breathing
  4. asthma

MCQ 23: Stimulus for breathing is:

  1. lack of oxygen in blood
  2. excess of carbon dioxide in blood
  3. contraction of alveoli
  4. diaphragm movements

MCQ 24: Respiration is a/an:

  1. chemical process
  2. mechanical process
  3. electrical process
  4. oxidation process

MCQ 25: In respiration ultimate source of energy is:

  1. radiant energy
  2. chemical energy
  3. organic energy
  4. potential energy

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