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1.4 Respiration
This exercise will help you to sort out the differences between an observation, a result, a conclusion and an explanation.
Look at The language of science experiments in the English skills and support section for information about observations, results, conclusions and explanations. Sofi a set up this apparatus. potassium hydroxide solution to absorb carbon dioxide from air limewater to detect carbon dioxide
healthy mouse limewater to detect carbon dioxide SAMPLE
Sofia noticed that the limewater in the left-hand container did not go cloudy, even after a long time. After about 5 minutes, the limewater in the right-hand container went cloudy. The mouse appeared to be perfectly comfortable. Sofia thought that her experiment showed that the mouse produced carbon dioxide. a What observations did Sofia make? ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. b Describe the results of Sofia’s experiment. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. c What was Sofia’s conclusion? ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. d Write an explanation of how this apparatus works. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. SAMPLE
Exercise 2 Modal verbs
Modal verbs tell us about certainties and possibilities. In this exercise, you think about respiration and practise using modal verbs. Look at Modal verbs in the English skills and support section for information about modal verbs. Choose the best word or words to complete each sentence. Choose from these words: might might not must must not a Cells ....................... have mitochondria so that they can carry out aerobic respiration. b Cells ......................... be provided with glucose so that they can carry out aerobic respiration. c If you do the experiment using the apparatus with the mouse in it, you ......................... take the mouse out if it looks uncomfortable. d If seeds are not given enough oxygen, they .................................. germinate. e If I do the experiment again, my results .............................. be exactly the same. SAMPLE
