Question

where do light reactions take place in a cell?
in the thylakoid membranes
to split water molecules
in the cytoplasm
to create chlorophyll

Explanation:

In photosynthesis, light - dependent reactions occur in the thylakoid membranes of chloroplasts. They use light energy to split water molecules, but the location is the thylakoid membranes. The cytoplasm is not the site of light reactions, and light reactions do not create chlorophyll.

Answer:

in the thylakoid membranes