What is the First Step of Photosynthesis

Question

What is the first step of photosynthesis?
A) Calvin cycle
B) light reactions
C) citric acid cycle
D) electron transport chain

Accepted Answer

The first step of photosynthesis is the light reactions, in which light energy is absorbed by pigments (such as chlorophyll) and converted into chemical energy in the form of ATP and NADPH. This energy is then used in the second step, the Calvin cycle, to convert carbon dioxide into glucose. The citric acid cycle and electron transport chain are part of cellular respiration, not photosynthesis.