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O LevelBiologyCambridge (CIE)Exam Questions10. Respiration10.3 Anaerobic Respiration

Anaerobic Respiration (Cambridge (CIE) O Level Biology): Exam Questions

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10.3 Anaerobic Respiration

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1a
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Fig. 1 shows an animal cell.

animal-cell-mitochondria-1

Fig. 1

Identify which letter represents the cell structure where respiration takes place and name the cell structure.

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1b
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Complete the following sentence about respiration:

u_2i9pRC_words

Respiration releases energy from __________ to be used in life processes such as ___________ reactions, __________ contraction and maintaining a constant body ____________.

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1c
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Complete Table 1 with a (✓) or a (X) to show the products and reactants of anaerobic respiration in animals.

Table 1

 

product

reactant

oxygen

 

 

carbon dioxide

 

 

lactic acid

 

 

glucose

 

 

water

 

 

ethanol

 

 

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1d
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An oxygen debt is often associated with anaerobic respiration. 

Describe the process that occurs in the body during an oxygen debt.

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1a
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Researchers in the Czech Republic investigated oxygen consumption in horses.

They measured the oxygen consumption of the horses while they were exercising at four different paces: walking, trotting, cantering and galloping.

The results are shown in Fig. 1.

061041-may-2018-paper-4-q5b-horse-walking---sq

Fig. 1

Calculate the percentage increase in the average rate of oxygen consumption as the horses change from walking to trotting.

Show your working.

 ____________% 

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1b
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The researchers also calculated the oxygen debt for each type of exercise.

They found that the horses developed a larger oxygen debt when they exercised by galloping and cantering rather than when they walked.

Explain why the horses developed an oxygen debt when they exercised.

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1c
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Describe how the horses would recover from an oxygen debt when they stop exercising.

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23 marks

Compare anaerobic respiration in muscles and anaerobic respiration in yeast  

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1a
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A person leaves a room and runs very fast for 200m. When the person stops running, his breathing rate and his heart rate remain high for several minutes.

Explain why the person’s breathing rate and heart rate remain high.

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1b
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The run results in changes in the skin involving the blood vessels and the sweat glands.

Describe what happens to the blood vessels and sweat glands during the run.

Explain why these changes happen.

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2
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Yeast cells can respire anaerobically.

Biotechnology makes use of this.

State two ways that the products of anaerobic respiration in yeast are used by humans.

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