Paper 2 H - SAMPLE SET 1 Q4
4) A student plans an investigation using mould.
4.1) Mould spores are hazardous.
Give one safety precaution the student should take when doing this investigation. [1 mark]
A student made the following hypothesis about the growth of mould:
4.1) Mould spores are hazardous.
Give one safety precaution the student should take when doing this investigation. [1 mark]
A student made the following hypothesis about the growth of mould:
‘The higher the temperature, the faster the growth of mould’.
The student planned to measure the amount of mould growing on bread.
The student used the following materials and equipment:
- slices of bread
- sealable plastic bags
- a knife
- a chopping board
- mould spores.
4.2) Describe how the materials and equipment could be used to test the hypothesis. [4 marks]
4.3) Give one variable the student should control in the investigation. [1 mark]
Another student did a similar investigation.
Figure 3 shows the results.
4.4) Determine the rate of mould growth at 42 °C between day 2 and day 7. [2 marks]
Rate of mould growth = ___________ units per day
4.4) The growth of mould shows decomposition of the bread.
Give a conclusion about decomposition from the results in Figure 3. [1 mark]
(Total for Question 4 = 9 marks)
Give a conclusion about decomposition from the results in Figure 3. [1 mark]
(Total for Question 4 = 9 marks)