Question

what is the main function of photosynthesis?
to split water molecules
to convert light energy into chemical energy
to absorb carbon dioxide
to release oxygen

Explanation:

Photosynthesis is a process in which plants, algae, and some bacteria use light - energy to convert carbon dioxide and water into glucose and oxygen, storing energy in the form of chemical bonds. The core function is the conversion of light energy into chemical energy. Splitting water molecules, absorbing carbon dioxide, and releasing oxygen are part of the process but not the main function.

Answer:

To convert light energy into chemical energy