CSEC Human and Social Biology · May/June 2009 · Paper 2 · Question 9(d)(i)
Explain how HIV affecting T lymphocytes impacts the human immune system.
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- 9(a)(i)Determine whether the statement is true or false: 'All bacteria are parasites.'[1 mark]
- 9(a)(ii)Determine whether the statement is true or false: 'There are harmful and useful bacteria.'[1 mark]
- 9(a)(iii)Determine whether the statement is true or false: 'A virus is a non-cellular organism.'[1 mark]
- 9(b)(i)State what Zara does in Step 3 of the experiment shown in Figure 4.[1 mark]
- 9(b)(ii)Describe what classmates should do at Step 2 to set up a control for this experiment.[1 mark]
- 9(c)(i)Suggest ONE other sign or symptom of cholera aside from diarrhoea.[1 mark]
- 9(c)(ii)Explain how villagers may have contracted cholera from flood waters.[2 marks]
- 9(d)(ii)Suggest ONE method of preventing the spread of HIV.[1 mark]
More practice: the rest of this paper · more Sexually Transmitted Infections and Chronic Diseases questions · all CSEC Human and Social Biology past papers