• Remind learners about how they carried out Activity 1 in Unit 1. Ask them to repeat the exercise for respiration and fill in the table for this activity.
Suggested answers 3
Photosynthesis Oxygen, glucose Respiration
Requirements Carbon dioxide, water, light Glucose, oxygen Products
Assessment guidelines
• This activity is intended for informal assessment. • Use the suggested answers supplied above to assess learners informally. Ask learners to swap books with a partner and mark each other’s work. Ask them to allocate learners a mark out of 10.
Remediation/Remedial activity Recap the reactions that occur in photosynthesis and respiration on the board.
Activity 2 Test for the presence of carbon dioxide in exhaled air Learner’s Book page 19 Guidelines to implement this activity
• This is a pair activity. • Read through the method of this experiment with learners and explain anything they do not understand.
• Ask them to write the answers to the questions in their workbooks. Background knowledge When carbon dioxide reacts with limewater it turns the limewater milky.
Suggested answers
1 The limewater turns milky. 2 Carbon dioxide was in the air that was breathed through the straw into the limewater.
Assessment guidelines • This activity is intended for informal assessment. 31
Carbon dioxide, water, energy Total: 10 marks
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