PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Light causes glucose to be synthesized directly inside the chlorophyll molecules of the photosystems.
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Light causes electrons to get excited (gain energy) and travel down the electron transport chain embedded in the thylakoid membrane.
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Light causes the conversion of water into carbon dioxide, oxygen, and electrons.
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Light directly causes carbon dioxide to attach to RuBP during the carbon fixation stage of the Calvin Cycle.
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Detailed explanation-1: -Light causes electrons to get excited (gain energy) and travel down an electron transport chain embedded in the thylakoid membrane.
Detailed explanation-2: -A photon of light hits chlorophyll, causing an electron to be energized. The free electron travels through the electron transport chain, and the energy of the electron is used to pump hydrogen ions into the thylakoid space, transferring the energy into the electrochemical gradient.
Detailed explanation-3: -When light strikes chlorophyll (or an accessory pigment) within the chloroplast, it energizes electrons within that molecule. These electrons jump up to higher energy levels; they have absorbed or captured, and now carry, that energy.
Detailed explanation-4: -But what happens to the electrons in these photosystems? Light first hits photosystem II, and its energy is absorbed by the pigments within this photosystem. This excites the electrons, and they move to a higher energy level. The electrons then exit the photosystem and move down the electron transport chain.
Detailed explanation-5: -In Summary: The Light-Dependent Reactions of Photosynthesis A photon strikes photosystem II to initiate photosynthesis. Energy travels through the electron transport chain, which pumps hydrogen ions into the thylakoid space. This forms an electrochemical gradient.