2022 · Q19
Which one of the following statements about the process of photosynthesis is correct ?
General KnowledgeBiology
- ALight energy is directly converted to kinetic energy which oxidizes carbon dioxide.
- BLight energy is directly converted to chemical energy which causes reduction of water. 44
- CChlorophyll absorbs the chemical energy of light which causes oxidation of carbon dioxide.
- DChlorophyll absorbs Light energy which causes splitting of water molecules and reduction of carbon dioxide.
Explanation
In photosynthesis, chlorophyll absorbs light energy, which drives the splitting (photolysis) of water molecules, releasing oxygen. The energy captured is used to reduce carbon dioxide to glucose in the Calvin cycle. Light energy is not converted directly to kinetic energy, nor does it oxidise carbon dioxide. Hence the correct description is the splitting of water and reduction of carbon dioxide.