Question

question 24 of 25
where do electrons get their energy in photosystem ii?
a. from energy in photons
b. from nad and nadph
c. from glucose in the calvin cycle
d. from adp and atp

Explanation:

In photosystem II, electrons gain energy from photons. When photons (light energy) strike photosystem II, they excite electrons. NAD and NADPH are involved in later stages (like the Calvin cycle for NADPH), not in providing energy to electrons in photosystem II. Glucose is a product of the Calvin cycle (which occurs after the light - dependent reactions involving photosystem II) and ADP and ATP are energy - carrying molecules but not the source of energy for electrons in photosystem II. The key here is the role of light (photons) in exciting electrons in photosystem II.

Answer:

A. From energy in photons