light independent reaction Flashcards
what is photolysis
splitting by water where h+ ions and OH ions are split
what is photoinosiation
where chlorophyll molecules become ionised
why does photoinosation occour
because chlorophyll absorbs light meaning ions have more energy leaving the chlorophyll molecule
where does light enter
through photosystem 2
descibe the electron transfer chain in the light dependent reaction
- chlorophyll in PS2 absorbs light and photoinisation occours.
- electrons become excited and gain energy moving up PS2.
- electrons diffuse along cyctochrome and up PS1
- where nadp becomes reduced with the addition of hydrogen and elctrons becoming nadph
describe the H journey in the light dependent photosynthesis
- photolysis occours in ps2 and hydrogen released.
- hydrogen in stroma diffuse down chemiosmotic gradient into thylakoid lumen
- hydrogen ions diffuse up ATP synthase into stroma
- drives conversion of adp+pi to ATP
how do H+ molecules get across the thaylakoid membrane
chemiosmosis
what occours in the ATP synthase
[prontons move down gradient through ATP synthase. the movement of protons drives conversion of adp to ATP so adp+p is converted to ATP by with the use of the H+
what does the movemne to fprotons in the atp synthase cause
movement of protons drives the conversion of adp into atp
what are the two products of the lightdependent reaction
NADPH and ATP
what stages does photoionisation occour
when the light enters the chloroplasts the it absorbs light energy cuaing elctrons to become excited gaining energy leaving the reaction centre
what are the product of the LDR
NADPH
ATP
