Question

question 27 (1 point)
what happens to electrons in photosystems when light hits them?
o a they become \excited\ and jump to higher energy levels, moving to other molecules
o b they lose energy and return to the nucleus of the atom
o c they are released into the stroma to power the calvin cycle
o d they combine with oxygen to form water molecules

Explanation:

When light hits the electrons in Photosystems, they absorb energy. This absorption causes them to become "excited" and jump to higher energy levels. They then move to other molecules as part of the electron - transport chain in photosynthesis. Option b is incorrect because electrons do not return to the nucleus of the atom in this context. Option c is wrong as electrons are not directly released into the stroma to power the Calvin Cycle (ATP and NADPH from the light - dependent reactions power the Calvin Cycle). Option d is incorrect because electrons do not combine with oxygen to form water molecules in the photosystems (water is split in the photosystems, releasing oxygen as a by - product).

Answer:

A. They become "excited" and jump to higher energy levels, moving to other molecules