# 4.7.2b Alcohol and Its Effects on Health (Structured Questions)

Question 2:
Diagram 2 shows an experiment to study a fermentation process carried out at different temperature.

(a)(i) State one observation from this experiment. [1 mark]
(ii) Based on the observation in 2(a)(i), state one inference. [1 mark]

(b) State one manipulated variable in this experiment. [1 mark]

(c) Mark (√) the foods which can be used in this experiment. [1 mark]
Rice (   )
Cheese (   )
Pineapple (   )

(d) State the operational definition of fermentation. [1 mark]

(a)(i)
The volume of gas collected in the burette at 28oC is larger than the volume of the gas collected in the burette at 10oC.

(a)(ii)
Yeast is more active at 28oC than at 10oC.

(b)

Temperature

(c)
Rice ( √  )
Cheese (   )
Pineapple ( √  )

(d)

The volume of gas collected in the burette represents the rate of fermentation.