Question

Correct order of electron flow in the light reactions of photosynthesis

Answer 1

Electrons are transferred sequentially between the two photosystems, with photosystem I acting to generate NADPH and photosystem II acting to generate ATP. The pathway of electron flow starts at photosystem II, which is homologous to the photosynthetic reaction center of R. viridis already described.

Answer 2

QUESTION:-

Correct order of electron flow in the light reactions of photosynthesis

ANSWER:-

• WATER (H20) →P680 chlorophyll a pair → PS II primary electron acceptor → Pq → cytochrome complex → Pc → P700 chlorophyll a pair → PSI primary electron acceptor → Ferrodoxin → NADPH

EXPLANATION:-

• Light reactions of photosynthesis happen inside thylakoids which are pendant upon light. It includes photolysis of water (breaking of water into hydrogen and oxygen and produces assimilation power known as NADPH and ATP.

• An electron that is released while the process of photolysis of water is picked up by P680 which is the photo centre of Photosystem II.

• From here the electrons pass over the procession of the porter which comprises PQ, cytochrome b-f complex, and PC.

• The electrons lose enough energy for the production of the proton gradient and ATP from ADP and inorganic phosphate during the passing of electrons over the cytochrome complex.

• The electron from PC loses enough energy for the production of the proton gradient and ATP from ADP and inorganic phosphate.

• The electron from PC is chosen by the trap centre known as P700 of Photosystem I, which after absorption of light energy, pushes out the electron.

• An electron that is passed over by carriers FeS, ferredoxin and NADP reductase which gives an electron to NADP positive for combing with H positive to produce NADPH.

• Hence, order of electron flow in the light reactions of photosynthesis is

H2O → P680 chlorophyll a pair → PS II primary electron acceptor → Pq → cytochrome complex → Pc → P700 chlorophyll a pair → PSI primary electron acceptor → Ferrodoxin → NADPH

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