light dependent stage of photosynthesis Flashcards

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1
Q

what is photolysis

A

splitting by water where h+ ions and OH ions are split

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2
Q

what is photoinosiation

A

where chlorophyll molecules become ionised

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3
Q

why does photoinosation occour

A

because chlorophyll absorbs light meaning ions have more energy leaving the chlorophyll molecule

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4
Q

where does light enter

A

through photosystem 2

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5
Q

what is the electron path way in the light dependent stage

A

during the phosporolation of the h+ ions 2e-travels up through the reaction centre in phtosystem two where it gains a higher energy level down the cytochrome along the electron transfer chain up through photosystem 1 and helps bond NADP +H+ to form NADPH.

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6
Q

describe the H journey in the light dependent photosynthesis

A

through cheomosmosis the H+ goes down through the thylaokoid membrane and into the thylakoid lubem where it sets up a proton gradient and joins with the 2H+ and 1/2 O2 from the photolysis of H2O. it then travels toand up the atp synthase

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7
Q

how do H+ molecules get across the thaylakoid membrane

A

chemiosmosis

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8
Q

what occours in the ATP synthase

A

[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+

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9
Q

what does the movemne to fprotons in the atp synthase cause

A

movement of protons drives the conversion of adp into atp

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10
Q

what are the two products of the lightdependent reaction

A

NADPH and ATP

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11
Q

what stages does photoionisation occour

A

when the light enters the chloroplasts the it absorbs light energy cuaing elctrons to become excited leaving the reaction centre

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