Summative Practice 1 (Question 3) – Form 5 Science (KSSM) Chapter 1


Question 3:
Figure 3 shows an experiment to study the effect of temperature on the growth of Bacillus sp.


The condition of the nutrient broth in test tubes P, Q and R is observed after three days. The results of the experiment are recorded in Table 1.


(a) State one observation of the nutrient broth that was kept at a temperature of 37°C for three days.

(b) State the hypothesis for this experiment.

(c) State the variables in this experiment.
(i) Manipulated variable
(ii) Responding variable

(d) State one inference that can be made based on the observation of this experiment.


Answer:
(a) Cloudy

(b) The optimum temperature for growth of bacteria is 37°C.

(c)(i) Temperature
(c)(ii) Condition of nutrient broth after 3 days

(d) The nutrient broth is cloudy at 37°C because 37°C is the optimum temperature for bacterial growth.

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