Question
The experiment below was set-up to investigate some physiological processes. The glucose solution was first boiled then cooled. The set-up was left for 24 hrs.
(a) Suggest two aims of the experiment
(b) (i) State the expected observations after 24 hours.
(ii) Explain your observations in b (i) above.
(iii) Why was glucose solution boiled then cooled?
(c) Suggest a control for the above experiment.
(a) Suggest two aims of the experiment
(b) (i) State the expected observations after 24 hours.
(ii) Explain your observations in b (i) above.
(iii) Why was glucose solution boiled then cooled?
(c) Suggest a control for the above experiment.
Answer
(a)
- To find out whether energy /heat is released in anaerobic respiration /fermentation
- To investigate the gas produced during fermentation/anaerobic respiration. (b)
(i) (significant)rise in temperature ;color of bicarbonate indicator turns yellow.
(ii) Yeast will respire aerobically releasing energy /and carbon dioxide gas that turn indicator yellow.
(iii) Expel /drive out oxygen
(c) Use glucose solution without yeast cells/killed yeast cells.
- To find out whether energy /heat is released in anaerobic respiration /fermentation
- To investigate the gas produced during fermentation/anaerobic respiration. (b)
(i) (significant)rise in temperature ;color of bicarbonate indicator turns yellow.
(ii) Yeast will respire aerobically releasing energy /and carbon dioxide gas that turn indicator yellow.
(iii) Expel /drive out oxygen
(c) Use glucose solution without yeast cells/killed yeast cells.
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