Question

Which of the following events does not occur in photosynthesis?

Options

• conversion of light energy into chemical energy

• reduction of carbon dioxide to carbohydrates

• oxidation of carbon to carbon dioxide

• absorption of light energy by chlorophyll

Answer 1

oxidation of carbon to carbon dioxide

Explanation:

Photosynthesis absorbs light energy (by chlorophyll) and converts it into chemical energy (light reactions), then uses that energy to reduce carbon dioxide into carbohydrates (Calvin cycle). Oxidising carbon to CO₂ is the opposite process (occurs in respiration). This happens instead during cellular respiration, when cells burn glucose to release usable energy.