Multiple choice

Which of the following products is common in respiration and photosynthesis?

  1. Water

  2. Oxygen

  3. Carbon dioxide

  4. None of these
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A Correct answer
Explanation

Water is the only substance that appears in both photosynthesis (as a reactant) and respiration (as a product). In photosynthesis: 6CO2 + 6H2O → glucose + 6O2. In respiration: glucose + 6O2 → 6CO2 + 6H2O. Oxygen is only produced in photosynthesis, CO2 only in respiration.

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