During photosynthesis, electrons are boosted to a higher energy level from

Photosystem I

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Photosystem II

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Photosystems I and II

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Chemiosmosis

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Solution

The correct option is D Photosystems I and II
During photosynthesis light energy is converted to chemical energy of glucose. Light energy is absorbed by a pair of chl a molecules, of PS I or PS II, this excited chl a molecule releases one e $^{-}$ , that moves through the ETS of the PSI and PSII releasing energy at each level during the transport, used for the formation of ATP
So, the correct answer is 'Photosystems I and II'

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