In both photosystem I and photosystem II, light energy is used to excite electrons. The two photosysterns were narmed in the order of their discovery, and not the order of their work in the light-dependent reactions. Photosystem Il comes first in the sequence of events that moves
electrons from water molecules to their destination, NADP. Hydrogen ions travel with the electrons, and they change NADP into NADPH. The
process is summarized in this diagram.
The concentration of hydrogen ions is greater inside the thylakoid than outside. Which reaction or set of reactions releases hydrogen ions
inside the thylakoid?
2*+2(NADP)+ d0>NADPH
To Light-
Independenm
w
Light
Light
Resctic
STROMA
OH
H
Ht
H*
Thy akoid
mernbrane
ATP
Electron caien
hase
To Light
Independent
systern
K Reactions
ptosyster
OH
o
OH
2H, O
THYLAKOID SPACE
4H

2H⁺ + 2ⓃⒶⒹⓅ⁺ + 4e⁻  ➠ 2 ⒩⒜⒟⒫⒣

Explanation:

In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb energy from sunlight. The most common and abundant pigment is chlorophyll a. 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. The ions flow through ATP synthase from the thylakoid space into the stroma in a process called chemiosmosis to form molecules of ATP, which are used for the formation of sugar molecules in the second stage of photosynthesis. Photosystem I absorbs a second photon, which results in the formation of an NADPH molecule, another energy carrier for the Calvin cycle reactions.

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