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Answers
In test tube A there is a thin film of oil which does not allow the movement of oxygen inside the test tube hence yeast will not get oxygen to carry out aerobic respiration. Hence it use the sugar solution to carry out anaerobic respiration (fermentation) whose end product is alcohol and carbon dioxide. Thus product of respiration in test tube A is alcohol.
In test tube B there is no thin film of oil hence oxygen will go inside the test tube and yeast will use the sugar solution to carry out aerobic respiration whose end product is carbon dioxide and water. Thus product of respiration in test tube B is carbon dioxide and water.
in both of them respiration with take place in test tube A ethanol would be created due to anaerobic respiration and Co2 would be produced in test tube B