Splitting of water molecules
Water participates directly in the light reactions of photosynthesis by donating electrons to photosystem II. Photosystem I and photosystem II both contain chlorophyll as molecules.
No, they move from photosystem 2 to photosystem 1. 2 evolved first but was not discovered until after photosystem 1.
The water they split to replace the electrons lost to photosystem II from the electron excitation of chlorophyll by photons of light.
The light (dependent) reactions. Water is split into its components, hydrogen and oxygen. Gaseous oxygen is released as a by-product, the hydrogens are further split into protons and electrons, the electrons are use to replenish those lost by Photosystem II, and the protons are eventually picked up by NADP coenzyme. The coenzyme is reduced to NADPH, which is later utilized in the dark reactions to reduce atmospheric carbon dioxide.
I believe it may be solar energy considering the start of the excited electrons journey in photosystem II (?)
The thylakoid membrane contains 2 photosytems, known as Photosystem I and Photosystem II. Together, they function to absorb light and transfer energy to electrons.
From energy in photons
Water participates directly in the light reactions of photosynthesis by donating electrons to photosystem II. Photosystem I and photosystem II both contain chlorophyll as molecules.
they move through an electron transport chain to photosystem 1
No, they move from photosystem 2 to photosystem 1. 2 evolved first but was not discovered until after photosystem 1.
Ultimately, the electrons taken when water is split in photosystem II during the process of photolysis.Photosystems loose electrons during light reactions.Their lost electrons are replaced by photolysis of water
Photosystem II most likely evolved first because it provides the energy for producing ATP and passes its electrons to photosystem I.
They go into photosystem I.
The flow of electrons in photosynthesis has four sequential steps. Here is the sequence: from water to photosystem II then photosystem I and lastly NADP.
They pass through a series of compounds to photosystem I, losing energy along the way. Photosystem I, like photosystem II, emits high-energy electrons in the light, and the electrons from photosystem II replace these. Photosystem II contains chlorophyll molecules. When a photon (quantum of light) reaches one of these chlorophyll molecules, the light energy activates an electron. This is then passed to the reaction center of the photosystem, where there are two molecules of chlorophyll P680. These pass the electrons to plastoquinone, which, like the chlorophylls, is embedded in the thylakoid membrane. The plastoquinone changes its position within the membrane, and passes the electrons to cytochromes b6 and f. At this stage the electrons part with a significant proportion of their energy, which is used to pump protons (H+) into the thylakoid lumen. These protons will later be used to generate ATP by chemiosmosis. The electrons now pass to plastocyanin, which is outside the membrane on the lumen side. Photosystem I is affected by light in much the same way as photosystem II. Chlorophyll P700 passes an activated electron to ferredoxin, which is in the stroma (the liquid outside the thylakoid). Ferredoxin in turn passes the electrons on, reducing NADP+ to NADPH + H+. Photosystem I accepts electrons from plastocyanin. So, effectively, photosystem II donates electrons to photosystem I, to replace those lost from photosystem I in sunlight. How does photosystem II recover electrons? When it loses an electron, photosystem II becomes an oxidizing agent, and splits water: 2H2O forms 4H+ + 4e- + O2. The electrons return photosystem II to its original state, and the protons add to the H+ concentration in the thylakoid lumen, for later use in chemiosmosis. The oxygen diffuses away.
donating electrons to photosystem II
oxygen is generated when two molecule of water are split to provide electrons lost by photosystem II so that the process of photosynthesis can continue progressively.