A student investigates whether respiration is exothermic. The student puts living germinating peas into one vacuum flask and boiled peas into a second vacuum flask. Before setting up the flasks, the student rinses both sets of peas in disinfectant. Why does the student rinse the peas in disinfectant?
to kill microorganisms whose respiration would also release heat
to kill the pea cells so that they can no longer respire at all
to supply the pea cells with extra glucose for use in respiration
to stop the pea cells releasing carbon dioxide into the flasks
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.