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Question

Herbicide Diuron inhibits the flow of electron from

A
PQ→ PC
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B
P680→ pheophytin
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C
Fe-S→ Fd
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D
Cyt b6f→ PC
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Solution

The correct option is A PQ→ PC
When PS II receives a light of wavelength 680nm, the electron is extruded. It passes sequentially through a series of electron carriers namely phaeophytin, plastoquinone, cytochrome b6f complex and plastocyanin. The electron loses an adequate amount of energy while passing over the cytochrome complex. This energy is used in the synthesis of ATP. The electron is then passed onto PS I. When PS I absorbs light of wavelength 700nm, it expels the electron which is received by a modified chlorophyll molecule A0, A1, Fe-S centre, ferredoxin (Fd) and finally to ferredoxin NADP+ reductase (FNR) which passes on the electron to NADP+ which gets converted to NADPH.
Diuron blocks the electron transport chain as it prevents the passage of electrons from PQ to cyt b6f and subsequently to PC.

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