SPM Science 2019, Paper 2 (Question 3)

Question 3:
A group of students carried out an activity to prepare bread dough by using the following recipe:

After 30 minutes, the observation is recorded as in Table 2.

Table 2

(a) What is the factor that being changed for this experiment? [1 mark]

(b) State one inference from this experiment. [1 mark]

(c) Predict what will happen to Dough A if the cold water in Step 2 of the procedure is replaced with boiling water.
Explain your answer. [2 marks]

(d) Based on this experiment, state the operational definition of yeast. [1 mark]

(a) Temperature of the surroundings

(b) The growth of microorganism (yeast) is affected by temperature.

(c) Dough A will not expand. The boiling water kills the yeast.

(d) Growth of yeast is defined operationally as the expansion of yeast.

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