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DCMU is a herbicide which blocked electron flow from

Option: 1

PS-II to PQ


Option: 2

PQ to Cytochrome


Option: 3

PS-I TO FRS


Option: 4

Cytochrome to Plastocyanine


Answers (1)

best_answer
DCMU is a potent inhibitor of photosynthesis that specifically targets the plastoquinone binding site in photosystem II. By doing so, it disrupts the flow of electrons from photosystem II to plastoquinone, effectively interrupting the photosynthetic electron transport chain. This interference hampers the plant's ability to convert light energy into chemical energy in the form of ATP and reduces power. Importantly, DCMU exclusively affects the electron flow in Photosystem II and does not impact Photosystem I or other crucial processes in photosynthesis, such as light absorption or carbon fixation in the Calvin cycle. Additionally, DCMU does not inhibit photolysis or dehydrogenase activities.

Hence, the correct answer is option a.

Posted by

Irshad Anwar

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