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Understanding Anaerobic Respiration: Key Concepts, Experiments, and Applications

In this lesson, we explore anaerobic respiration, a process that occurs in low or no oxygen environments. Students will differentiate between aerobic and anaerobic respiration in terms of energy production and cellular by-products across various organisms, including plants, yeast, and animals. With engaging group activities, students will identify false statements about anaerobic respiration and conduct hands-on experiments to observe fermentation in yeast. The session culminates in a deeper understanding of energy yield in anaerobic conditions and practical applications in biological studies.

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Understanding Anaerobic Respiration: Key Concepts, Experiments, and Applications

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  1. National Biology Anaerobic Respiration

  2. What do I know? Find the fib • In your groups come up with three statements • One of these statements will be false • You will then hand them in and the teacher will read them out to the class • The groups will then try to find the fib – can you trick them ???

  3. What are we learning today? We are learning to: • Explain the difference between aerobic and anaerobic respiration in terms of energy • Explain the difference between the products of anaerobic respiration depending on the organism it occurs in • State when and where anaerobic respiration occurs

  4. What is anaerobic respiration? • Anaerobic respiration occurs when there is little or no oxygen • Anaerobic respiration occurs in the cytoplasm • In plants and yeast anaerobic respiration is also known as fermentation

  5. Anaerobic respiration in plants • When plants respire anaerobically they use glucose to produce carbon dioxide and alcohol

  6. Anaerobic respiration in yeast • When yeast respire anaerobically they use glucose to produce carbon dioxide and alcohol Water bath Layer of oil Lime water Boiled yeast + glucose Live yeast + glucose

  7. Analysis of Experiment • Why was it important that the water was boiled for this practical? • Why was a layer of oil added to both tubes? • Why were both tubes put in the same water bath? • Why was the rubber tubing clamped? • What conclusion(s) can you draw from your results? • How could the experiment be made more reliable?

  8. Anaerobic respiration in animals • When animals respire anaerobically they use glucose to produce lactic acid • Suggest some circumstances when this occurs

  9. How much energy is produced? • When you sprint 100m can you sustain that for a long time? • Does you body have enough energy? • Does your body have enough oxygen? • Anaerobic respiration does not provide cells with enough energy for it to be sustained for a long period of time • Anaerobic respiration stops after glycolysis therefore only provides 2 molecules of ATP

  10. Summary equations In plants and yeast (this is not reversible) Glucose pyruvic acid CO2+ alcohol (ethanol) In animals (this is reversible) Glucose pyruvic acid Lactic acid

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