Photography website in orange county
"Photostem" does not appear to be a commonly used term. It may be a misspelling or a typo. Can you provide more context or clarify the term so I can better assist you?
Electrons in photosystem II get their energy from sunlight. When photons from sunlight are absorbed by the chlorophyll molecules in the photosystem, the energy is transferred to electrons, allowing them to become excited and drive the process of photosynthesis.