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Olympiad (Class 7) Respiration in organisms — practice questions — page 2

Explore 49 free Respiration in organisms questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Respiration in organisms questions and exercises with answers

Showing questions 31–49 of 49.

Respiration breaks big molecules into smaller ones. What kind of reactions are these?Read the answer and worked solution →Respiration burns food differently from fire. How is energy released?Read the answer and worked solution →Some bacteria live without oxygen in mud. Which fits them?Read the answer and worked solution →Which is an example of an organism group that carries out anaerobic respiration?Read the answer and worked solution →Waste water has too much nitrate. Which bacterial process turns it into harmless nitrogen gas?Read the answer and worked solution →Which part of the brain sets the rate and depth of your breathing?Read the answer and worked solution →In the lungs, the large air tubes branch into smaller ones. What are the smaller tubes called?Read the answer and worked solution →Breathed-out air has 100 times more carbon dioxide. Why?Read the answer and worked solution →Glycolysis occurs with or without oxygen. What does this show?Read the answer and worked solution →In glycolysis of one glucose, 4 ATP form but 2 are used. What is the net gain?Read the answer and worked solution →Three glucose molecules go through glycolysis, each netting 2 ATP. What is the total net ATP?Read the answer and worked solution →Which statement about fermentation without oxygen is correct?Read the answer and worked solution →Which gas do we inhale that is used by cells to oxidise food?Read the answer and worked solution →After a long sprint, what helps muscles recover from lactic acid?Read the answer and worked solution →Fermentation may begin even before oxygen runs out. In which activity?Read the answer and worked solution →Which muscles lift the rib cage when you breathe in?Read the answer and worked solution →Which gas is the end waste of both aerobic respiration and yeast fermentation?Read the answer and worked solution →Which breathing disorder name refers to stopping of breathing in sleep?Read the answer and worked solution →A bacterial colony in waste water cleans up toxic arsenate. Which process do they use?Read the answer and worked solution →

Worked practice questions

Respiration breaks big molecules into smaller ones. What kind of reactions are these?

  1. Nuclear
  2. Anabolic
  3. Catabolic
  4. Magnetic
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Correct answer: C. Catabolic

Reactions that break large molecules into smaller ones while releasing energy are called catabolic.

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Respiration burns food differently from fire. How is energy released?

  1. By freezing the sugar
  2. All at once as a flame
  3. By absorbing sunlight
  4. Slowly in small steps
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Correct answer: D. Slowly in small steps

Respiration is an unusual combustion because energy comes out slowly, step by step, rather than as a sudden flame.

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Some bacteria live without oxygen in mud. Which fits them?

  1. They breathe with lungs
  2. They may use nitrate
  3. They need sunlight to respire
  4. They have no energy needs
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Correct answer: B. They may use nitrate

Anaerobic respiration uses other acceptors such as sulfate, nitrate or sulfur in place of oxygen.

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