4. The figure below is an experiment set up to investigate gaseous exchange in living organisms. After every 10 minutes each test tube was gently shaken Platform Boiling tube, bicarbonate indicator, peeled potato, Germinating seed ,Bicarbonate Indicator ,Caterpiller (a) Name the test tube in which there will be colour change. (2mks) (b) Suggest the test tube in which the indicator would change colour fastest. Give reasons for your answer.
