Question

which is required for the light - dependent reactions in photosynthesis to occur?
o h₂o
o atp
o nadph
o co₂

Explanation:

In the light - dependent reactions of photosynthesis, water ($H_2O$) is split. ATP and NADPH are products of the light - dependent reactions, not requirements for their initiation. $CO_2$ is used in the light - independent reactions (Calvin cycle).

Answer:

A. $H_2O$