Question

When the two pigment systems absorb light in what direction does the energy flow between them?

• A. PS-I $\to$ PS-II
• B. PS-II $\to$ PS-I
• C. None of the above
• D. All of the above

Answer 1

Answer: (B)

PS-II $\to$ PS-I

During the light phase of photosynthesis, photosystem II participates before photosystem I high energy electrons from photosystem II are passed on to photosystem I to fill the electron hole created in the reaction centre of photosystem I. Thus, energy flows from photosystem II to photosystem I.

So, the correct answer is option B.