TREE PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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add H+ to NADP to form NADPH
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move H+ from the stroma to the thylakoid space
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move H+ from the thylakoid space to the stroma
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move the electrons to PS I
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Detailed explanation-1: -Once an electron has gone down the first leg of the electron transport chain, it arrives at PSI, where it joins the chlorophyll a special pair called P700. Because electrons have lost energy prior to their arrival at PSI, they must be re-energized through absorption of another photon.
Detailed explanation-2: -The two electrons lost from photosystem II are replaced by the splitting of water molecules. Water splitting also releases hydrogen ions into the lumen. This contributes to a hydrogen ion gradient similar to the one created by mitochondrial electron transport.
Detailed explanation-3: -The electrons then exit the photosystem and move down the electron transport chain. As electrons move from one component to the next, they release energy. The electrons that have left photosystem II need to be replaced, and these electrons are provided by the photolysis of water.
Detailed explanation-4: -From photosystem II, the excited electron travels along a series of proteins. This electron transport system uses the energy from the electron to pump hydrogen ions into the interior of the thylakoid.