AP BIOLOGY

PHOTOSYNTHESIS

LIGHT DEPENDENT REACTIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Hydrogen is a reactant. Light independent or light dependent stage?
A
Light independent stage
B
Light dependent stage
Explanation: 

Detailed explanation-1: -This takes place in the thylakoid membranes inside the ‘chloroplast’, an organelle found inside the cells of green tissue. Light provides energy for the chlorophyll molecule that releases electrons. These split water into oxygen and hydrogen.

Detailed explanation-2: -Explanation: The products of the light independent reaction are glucose, NADP+, and H2O. The reactants are CO2, NADPH, and ATP.

Detailed explanation-3: -The hydrogen ions are allowed to pass through the thylakoid membrane through an embedded protein complex called ATP synthase. This same protein generated ATP from ADP in the mitochondrion.

Detailed explanation-4: -A photon strikes the antenna pigments of photosystem II to initiate photosynthesis. The energy travels to the reaction center that contains chlorophyll a to the electron transport chain, which pumps hydrogen ions into the thylakoid interior (the lumen). This action builds up a high concentration of hydrogen ions.

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