Steps in non-cyclic photophosphorylation include passage of electrons along

Options

A. `FRS rarr FD rarr Cyt b_(6) rarr Cyt f rarr PC rarr Chl a`
B. `Chl a rarr Cyt b_(6) rarr Cyt f rarr PC rarr PS I rarr FRS rarr FD`
C. `Chl a rarr PQ rarr Cyt b_(6) rarr Cyt f rarr PC rarr PS I rarr FRS rarr FD`
D. `PQ rarr Cyt b_(6) rarr Cyt f rarr PC rarr PS I rarr FRS rarr FD`.

Answer

### Step-by-Step Solution:

1. **Understanding Non-Cyclic Photophosphorylation**:
Non-cyclic photophosphorylation is a process that occurs in the thylakoid membranes of chloroplasts during photosynthesis. It involves the movement of electrons through a series of proteins and molecules, ultimately leading to the production of ATP and NADPH.

2. **Initiation of Electron Flow**:
The process begins when light energy is absorbed by chlorophyll molecules in Photosystem II (PSII). This energy excites electrons, which are then transferred to a primary electron acceptor.

3. **Electron Transport Chain**:
The excited electrons travel through a series of electron carriers:
- **Plastoquinone (PQ)**: The first electron carrier that receives electrons from PSII.
- **Cytochrome b6f Complex**: After PQ, electrons are passed to the cytochrome b6f complex, which consists of two components:
- **Cytochrome b6**
- **Cytochrome f**
- **Plastocyanin (PC)**: Following the cytochrome b6f complex, electrons are transferred to plastocyanin.

4. **Photosystem I (PSI)**:
The electrons are then passed to Photosystem I (PSI), specifically to the reaction center known as P700. Here, the electrons are re-excited by light energy absorbed by PSI.

5. **Final Electron Acceptors**:
The final steps involve the transfer of electrons to:
- **Ferredoxin (FD)**: This is the final electron carrier in the non-cyclic pathway.
- **Ferredoxin-NADP+ Reductase (FNR)**: This enzyme catalyzes the reduction of NADP+ to NADPH using the electrons from ferredoxin.

6. **ATP Synthesis**:
As electrons move through the electron transport chain, protons are pumped into the thylakoid lumen, creating a proton gradient. This gradient drives ATP synthesis via ATP synthase.

### Final Answer:
The steps in non-cyclic photophosphorylation include the passage of electrons along:
**Plastoquinone (PQ), Cytochrome b6, Cytochrome f, Plastocyanin (PC), Photosystem I (P700), Ferredoxin (FD).**

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