Question

Electrons from the excited chlorophyll molecules of PS-II are first accepted by

• A. Pheophytin
• B. Ferredoxin
• C. Cytochrome \textit{f}
• D. Cytochrome \textit{b}

Hint:

In PS-II, the sequence of electron transfer starts as: Chlorophyll $a$ $\rightarrow$ \textbf{Pheophytin} $\rightarrow$ Plastoquinone.

Answer 1

The Correct Option is A

Step 1: In the light reaction of photosynthesis, Photosystem II (PS-II) absorbs light energy using chlorophyll \textit{a}.
Step 2: When chlorophyll molecules of PS-II become excited, they release high-energy electrons.
Step 3: The first stable electron acceptor in PS-II is pheophytin.
Step 4: From pheophytin, electrons are passed to plastoquinone and then through the cytochrome complex.