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]
Answer:
(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.
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]
Answer:
(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.