4.2.1 Aerobic & Anaerobic Respiration

• aerobic respiration = glucose + oxygen → carbon dioxide + water (+ energy)
• Is aerobic respiration an endothermic or exothermic reaction?

  Exothermic.
• anaerobic respiration in muscles = glucose → lactic acid
• Is more or less energy transferred in anaerobic respiration than aerobic respiration and why?

  Less as glucose isn’t fully oxidised.
• anaerobic respiration in plant and yeast cells = glucose → ethanol + carbon dioxide
• What is anaerobic respiration in yeast cells also known as?

  Fermentation.
• What are two uses of fermentation?

  Making bread and alcoholic drinks.
• What are 3 reasons living organisms need energy?

  • To build up larger molecules
  • To allow muscle contraction
  • To steady body temperature
• What kind of reaction is cellular respiration?

  Exothermic.
• Is cellular respiration occurring randomly, when necessary or continuously?

  Continuously.
• The energy transferred during cellular respiration supplies all the energy needed to carry out what?

  Living processes.
• What are the two types of respiration?

  Aerobic and anaerobic.
• What does aerobic mean?

  With/requiring oxygen.
• What does anaerobic mean?

  Without oxygen.
• What is the purpose of respiration in cells?


  To transfer energy.
• What is the chemical symbol for glucose?

  C6H12O6.
• What is the chemical symbol for carbon dioxide?

  CO2.
• What is the chemical symbol for water?

  H2O.
• What is the chemical symbol for oxygen?

  O2.
• What is the difference between aerobic and anaerobic respiration surrounding oxygen?

  Aerobic respiration requires oxygen, anaerobic respiration does not.
• What is the difference between aerobic and anaerobic respiration surrounding products?

  Aerobic respiration produces carbon dioxide and water whereas anaerobic respiration produces either lactic acid (in muscles) or ethanol and carbon dioxide (in plant and yeast cells).
• What is the difference between aerobic and anaerobic respiration surrounding energy transfer?

  Aerobic respiration releases the maximum amount of energy whereas anaerobic respiration only produces some.
• How does anaerobic respiration allow bread to rise?

  Yeast undergoes fermentation during the process of baking bread. The ethanol produced is evaporated away, however the carbon dioxide produced gets trapped in the bread making it rise.
• What are the 7 key life processes?

  Movement, respiration, sensitivity, growth, reproduction, excretion, nutrition.
• Where does respiration take place?

  Mitochondria.