The type of visual aid to be used is a diagram showing the stages of photosynthesis and the tree parts involved. Thus 2nd option is correct.
Photosynthesis refers to the process in which the plants prepares its own food. It is the process in which the plants uses the sunlight, water and carbon dioxide to produce the glucose.
In the process of the photosynthesis plants takes in the carbon dioxide and gives out the oxygen.
A diagram outlining the steps of photosynthesis and the components of the tree involved is the kind of visual aid that should be used. The second choice is the best one.
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