Question

in oxygenic photosynthesis, water is oxidized to oxygen gas (o2) in the light. reduced to oxygen gas (o2) in the light. oxidized to oxygen gas (o2) in the dark. reduced to hydrogen gas (h2) in the dark. reduced to hydrogen gas (h2) in the light.

Explanation:

In oxygenic photosynthesis, water is split in the light - dependent reactions. During this process, water molecules lose electrons and are oxidized to form oxygen gas ($O_2$). This occurs in the thylakoid membranes of chloroplasts in the presence of light energy.

Answer:

oxidized to oxygen gas ($O_2$) in the light.