WAEC Biology 2017 Objective — Question 24
Question 24 of 50 from the West African Examinations Council (WAEC) Biology 2017 Objective paper, with the correct answer and a full explanation.
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Which of the following processes are associated with photosynthesis? I. Energy from sunlight is absorbed II. Carbon dioxide is evolved III. Oxygen is given off IV. Glucose is synthesized.
- A. A. I and II only
- B. B. I, III and IV onlyCorrect
- C. C. I, II and IV only
- D. D. I, II, III and IV only
Explanation
During photosynthesis, CO2 is not evolved. Instead, it is used up! By-product of photosynthesis is O2. 6CO2+6H2O→C6H12O6+6O2. So I, III and IV are correct (energy absorbed, oxygen given off, glucose synthesized), but II (CO2 evolved) is incorrect.
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