Standard Science Primary 6 Energy

During photosynthesis, plants convert light energy into chemical potential energy. What are the two essential substances needed for this process to occur?

A Carbon dioxide and Oxygen
B Carbon dioxide and Water
C Water and Oxygen
D Sugar and Starch
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Worked Solution

Step 1: Photosynthesis is the process where plants make food. Step [2-9]: Plants take in carbon dioxide from the air and water from the soil. Step [2-9]: They use light energy trapped by chlorophyll to produce sugar.

Correct answer: Carbon dioxide and Water

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