Quelpr
1 markVectors, Microorganism Control and Immunity

CSEC Human and Social Biology · May/June 2009 · Paper 2 · Question 9(b)(ii)

Bacterial culturing experiment.

Describe what classmates should do at Step 2 to set up a control for this experiment.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 9(a)(i)Determine whether the statement is true or false: 'All bacteria are parasites.'[1 mark]
  2. 9(a)(ii)Determine whether the statement is true or false: 'There are harmful and useful bacteria.'[1 mark]
  3. 9(a)(iii)Determine whether the statement is true or false: 'A virus is a non-cellular organism.'[1 mark]
  4. 9(b)(i)State what Zara does in Step 3 of the experiment shown in Figure 4.[1 mark]
  5. 9(c)(i)Suggest ONE other sign or symptom of cholera aside from diarrhoea.[1 mark]
  6. 9(c)(ii)Explain how villagers may have contracted cholera from flood waters.[2 marks]
  7. 9(d)(i)Explain how HIV affecting T lymphocytes impacts the human immune system.[1 mark]
  8. 9(d)(ii)Suggest ONE method of preventing the spread of HIV.[1 mark]

More practice: the rest of this paper · more Vectors, Microorganism Control and Immunity questions · all CSEC Human and Social Biology past papers