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4 marksRespiration

CSEC Biology · January 2011 · Paper 2 · Question 4(b)(ii)

During intense exercise, there is an insufficient supply of oxygen to muscles for aerobic respiration.

In the absence of sufficient oxygen, anaerobic respiration occurs. Suggest ONE disadvantage of anaerobic respiration.

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Other parts of this question

  1. 4(a)(i)Using a diagram to illustrate the circulatory system, describe how oxygenated blood from the lungs is distributed to organs and tissues.[7 marks]
  2. 4(a)(ii)Explain how oxygen becomes available to a muscle tissue for respiration.[7 marks]
  3. 4(b)(i)Give TWO characteristics of aerobic respiration.[4 marks]
  4. 4(c)Transport vessels in plants have features that are similar to transport vessels in animals. Describe TWO ways in which xylem tissues are similar to blood…[4 marks]

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