# What molecule is released from stage one of photosynthesis, but does not move to stage two?

Apr 12, 2017

Oxygen.

#### Explanation:

In the light reaction, the splitting of water occurs due to the oxidised Photosystem II. Whereas, the oxidised Photosystem I gets the electron from Photosystem II.

Water splits as following:

$2 {\text{H"_2"O" -> 4"H"^(+) + "O"_2 + 4"e}}^{-}$

ATP produced from chemiosmotic hypothesis as well as NADPH2 produced in the light reaction go into the second stage i.e the Calvin cycle but not the oxygen molecule.