The energy that excites the photosystems is supplied by
A) electrons passing down the electron transport chain.
B) ATP.
C) photons.
D) NADPH.

Question

Quizplus · Accepted Answer

The energy that excites the photosystems is supplied by photons, which are absorbed by pigments such as chlorophyll a and b in the thylakoid membranes of chloroplasts. These pigments convert the energy of the photons into chemical energy that can be used in the light-dependent reactions of photosynthesis.

Note: While electrons passing down the electron transport chain and NADPH are involved in the light-dependent reactions and ultimately used to produce ATP and NADPH for the light-independent reactions, they do not directly supply the energy to excite the photosystems. ATP is also produced in the light-dependent reactions, but it is not the initial source of energy for exciting the photosystems.

The Energy That Excites the Photosystems Is Supplied by