Factors that Affect the Growth of Microorganisms (Structured Questions)

Question 1:
Diagram 1 shows an experiment to study the effect of temperature on the growth of bacteria.

After 2 days, the appearance of the nutrient broth in each test tube is observed. The result recorded is shown in Table below.

(a) State the variables in this experiment.
  (i) Manipulated variable
  (ii) Responding variable
(b) State the hypothesis for this experiment.
(c) State the inference that can be made based on this experiment.
(d) Based on this experiment, state the operational definition for bacteria.

(a)(i) Temperature

Growth of bacteria

A suitable temperature is essential for the growth of bacteria.

Bacteria growth very fast at 37oC

Bacteria are tiny living organisms which grow and reproduce themselves under a suitable temperature. 

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