Civil Services Prep

Prelims 2014 · Science and Technology · Question 45

Which one of the following is the process involved in photosynthesis?

  1. Potential energy is released to form free energy
  2. Free energy is converted into potential energy and stored
  3. Food is oxidized to release carbon dioxide and water
  4. Oxygen is taken, and carbon dioxide and water vapour are given out

Answer

Free energy is converted into potential energy and stored

  • (a) Incorrect. Photosynthesis does not release stored potential energy; it uses light energy to build energy-rich organic molecules.
  • (b) Correct. In photosynthesis, free energy from sunlight is converted into chemical potential energy and stored in glucose.
  • (c) Incorrect. This describes respiration/oxidation of food, not photosynthesis.
  • (d) Incorrect. This is broadly the pattern of respiration; in photosynthesis, plants take in carbon dioxide and release oxygen.
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