Question

Describe the pathway of electron transfer from photosystem II to photosystem I in light dependent reactions?

Short answer

A sequence of electron carriers transport the electron from photosystem II to photosystem I in the following order: PSII $\to$plastoquinone $\to$cytochrome complex $\to$plastocyanin $\to$PSI

Step-by-step solution

step-1: Definition

Light energy is converted into adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate in the light-dependent process, which occurs in the thylakoid membranes of chloroplasts. (NADPH).

step-2: Introduction

Photosynthesis uses light-dependent reactions to collect the sun's energy to hydrolyze water molecules and release electrons, hydrogen, and oxygen. The hydrogen and electron are used to make ATP and NADPH, which are then employed in carbon dioxide fixation dark processes.

Step-3: Explanation

Two photosystems are found in the thylakoids' walls that capture light. The water molecule is taken in by Photosystem II, which hydrolyzes it in order to catch the electron released in the process. The electron is subsequently transported through a succession of electron carriers to photosystem I, and finally to NADP+ reductase to create NADPH from photosystem II.

The electron obtained by the hydrolysis of a water molecule is collected by the photosystem II of $\mathrm{P}680$. The electron is delivered to plastoquinone, an electron transporter that carries it to the cytochrome complex. The electron is delivered to the plastocyanin, which carries it to the photosystem I of $\mathrm{P}700$where it is re-energized and sent to $\mathrm{NADP}+$ for the formation of$\mathrm{NADPH}$.