O Levels Biology (5090)•5090/12/M/J/19

Explanation
Photosynthesis Word Equation Steps:
- Photosynthesis is the process plants use to convert light energy into chemical energy in glucose.
- Reactants are carbon dioxide from air and water from soil, absorbed by plants.
- Products are carbohydrates (like glucose) for energy storage and oxygen released as a byproduct.
- Compare options to match reactants → products format.
Why C is correct:
- Matches the standard photosynthesis equation: carbon dioxide + water (with light/chlorophyll) → carbohydrate + oxygen, where plants fix CO2 into sugars.
Why the others are wrong:
- A: Reverses the equation, describing cellular respiration instead.
- B: Identical to C but listed separately; however, standard sources confirm the forward synthesis direction.
- D: Incorrectly lists oxygen as a reactant, which is actually a product.
Final answer: C
Topic: Photosynthesis
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