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By the middle of the nineteenth century, the overall equation of photosynthesis was written as

  • (a) CO2 + H2O + light → [CH2O] + O2 Correct
  • (b) [CH2O] + O2 → CO2 + H2O + energy Your answer
  • (c) CO2 + H2S → [CH2O] + S Your answer
  • (d) CO2 + H2O → [CH2O] + O2 (in the dark) Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

By the middle of the nineteenth century, it was known that plants use light energy to make carbohydrates from CO2 and water, releasing O2: CO2 + H2O + light → [CH2O] + O2.

Why the other options are wrong

  • (b) · your answer This is the equation for respiration.
  • (c) · your answer This is bacterial (anoxygenic) photosynthesis, described later by van Niel.
  • (d) · your answer Light is needed; photosynthesis does not happen in the dark.
NCERT point: [CH2O] represents a carbohydrate.
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