Topic 1 Photosynthesis and respiration Unit 1 Photosynthesis Learner’s Book pages 12–15 Unit overview


This unit introduces photosynthesis as a process that captures energy from the Sun and learners will explore the role of chlorophyll in photosynthesis. Resources


Cardboard, scissors, leaves (freshly picked in the sunshine), heat source/spirit or Bunsen burner (or kettle), glass beaker, test tube, water, ethanol or methylated spirits (alcohol), iodine solution, dropper, white piece of cardboard, saucer or ceramic tile, forceps/tweezers


Teaching guidelines


Introduce this unit by asking learners what would happen to plants if there was no Sun. Have a brainstorming session about the importance of plants in our world.


TIP!


Have a poster on the classroom wall summarising the processes of photosynthesis: carbon dioxide + water → glucose + oxygen


Background knowledge


All living things need energy to sustain life, and plants harvest this energy from the Sun in the form of heat and light using a process called photosynthesis.


Activity 1 Write about requirements and products of photosynthesis


Learner’s Book page 13 Guidelines to implement this activity


• This is an individual activity. • Ask learners to read through the instructions and explain anything they do not understand.


Background knowledge


It is important that learners know that chlorophyll is a very special and important substance which all plants need to help them photosynthesise. 28


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