PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hydrolyse NADP+ at the end of the ETC
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Involve directly in the production of ATP
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Replace the excited electron of reaction centre molecule in photosystem II
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Involve directly in Calvin Cycle
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Detailed explanation-1: -Light energy causes the excitation and loss of an electron from a PSII reaction center chlorophyll (P680). Water is oxidized to replace the lost electron, generating H+ ions and oxygen (O-2) ions. These O-2 ions combine to form the diatomic O2. The excited electron is boosted to a higher energy state.
Detailed explanation-2: -Water is used to provide hydrogen ions and electrons but also produces oxygen. The electrons and protons are used to produce NADPH (the reduced form of nicotine adenine dinucleotide phosphoric acid) and ATP (adenosine triphosphate). ATP and NADPH are energy storage and electron carrier/donor molecule.
Detailed explanation-3: -The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.
Detailed explanation-4: -The two electrons lost from photosystem II are replaced by the splitting of water molecules. Water splitting also releases hydrogen ions into the lumen.