The sunlight energy used by green plants in photosynthesis is transformed into

Question

UnlockIAS · Accepted Answer

Correct — A, chemical energy. In photosynthesis, chlorophyll traps radiant (light) energy from the Sun and uses it to build glucose from carbon dioxide and water. The light energy ends up stored in the chemical bonds of that glucose — i.e. it is converted into chemical energy. Plants (and later the animals that eat them) release this stored chemical energy during respiration.

Why the other options are wrong — (b) Photosynthesis stores energy in the chemical bonds of carbohydrate, not as some vague 'physical energy'. 'Physical energy' is not the recognised product of the light reactions.  (c) Since the transformation is only into chemical energy, 'both' is wrong — physical energy is not produced.  (d) Wrong — a definite product, chemical energy, is formed, so 'none' cannot be correct.

Concept: Photosynthesis is an energy-conversion process: light energy is captured by the green pigment chlorophyll and transformed into chemical energy stored in glucose (C6H12O6). The overall reaction is 6CO2 + 6H2O + light energy -> C6H12O6 + 6O2. Respiration later reverses this, releasing the stored chemical energy for the cell to use.

State PCS 2018 Q6 — Science & Technology PYQ with Answer

State PCS 2018 Q6 — Science & Technology PYQ with Answer