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IGCSE O Level Biology MCQs (O Level) From Textbook

IGCSE O Level Biology MCQs – Practice Test 8 (Chapter 15)

Respiration in Biology Notes Questions and Answers PDF – Test 8

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Free Respiration in Biology Notes App Download: Composition of oxygen (O2) in inspired air is approx.; MCQ with answers: 0.165, 0.21, 0.78, and 0.9. Practice Introduction to Biology Quiz Questions, download Kobo e-Book (Free Chapter) to master biology fundamentals.

Respiration in Biology Notes Q&A PDF Download – Practice Test 8

MCQ 36: In order to recover the fatigue, the lactic acid is:

  1. taken to muscles
  2. taken away from muscles
  3. converted to galactose
  4. converted to glucose

MCQ 37: Composition of oxygen (O2) in inspired air is approx.:

  1. 0.21
  2. 0.165
  3. 0.78
  4. 0.9

MCQ 38: External Nares are connected to internal Nares through:

  1. larynx
  2. mucus
  3. pharynx
  4. nasal passage

MCQ 39: Breathing occurs due to:

  1. chemical process
  2. muscular contractions and movements of ribs
  3. oxidation of organic molecules to release energy and water
  4. physical process

MCQ 40: In respiration oxygen debt refers to the amount of:

  1. oxygen required for oxidation
  2. oxygen lent to other muscles
  3. oxygen required to oxidize lactic acid
  4. oxygen required in rigorous running and physical activities

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