Question 2:
Diagram 2 shows an experiment to study the effect of light on the growth of bacteria.
Diagram 2
The condition of the nutrient broth in test tube P and Q is observed after three days.
The result of this experiment is recorded in Table 2.
Answer:
(a) Condition of nutrient broth is cloudy.
(b) The bacteria grow actively in dark condition.
(c)(i) Presence of light
(c)(ii) Condition of nutrient broth
(d) Bacteria is a microorganism that caused the condition of nutrient broth turns cloudy.
Diagram 2 shows an experiment to study the effect of light on the growth of bacteria.
Diagram 2
The condition of the nutrient broth in test tube P and Q is observed after three days.
The result of this experiment is recorded in Table 2.
Table 2
(a) State one observation on the nutrient broth which has been kept in the black box for three days. [1 mark]
(b) State one inference for this experiment. [1 mark]
(c) State the variables in this experiment. [2 marks]
(i) Manipulated variable
(ii) Responding variable
(d) Based on this experiment, state the operational definition of bacteria. [1 mark]
Answer:
(a) Condition of nutrient broth is cloudy.
(b) The bacteria grow actively in dark condition.
(c)(i) Presence of light
(c)(ii) Condition of nutrient broth
(d) Bacteria is a microorganism that caused the condition of nutrient broth turns cloudy.