Photosynthesis: Photolysis of Water Flashcards Preview

A2 Biology: Photosynthesis & Respiration > Photosynthesis: Photolysis of Water > Flashcards

Flashcards in Photosynthesis: Photolysis of Water Deck (12):
1

when light hits the chlorophyll molecule, what happens to its electrons?

electrons are lost which shortens its number electrons

2

if a chlorophyll molecule is to continue absorbing light energy, what must happen to its electrons?

the electrons must be replaced

3

what do water molecules split using light energy provide?

the replacement electrons

4

what else does the photolysis of water produce?

produces protons (H⁺)

5

what is the equation for the photolysis of water?

2H₂O (+ light) → 4H⁺ + 4e⁻ + O₂

6

what do these protons (H⁺) go through to pass out of the thylakoid space?

ATP synthase channels

7

when the protons (H⁺) are passed out of the thylakoid space, what are they taken up by?

an electron carrier called NADP

8

what happens to the NADP when it takes up the protons (H⁺)?

it becomes reduced

9

what is reduced NADP (NADPH⁺)?

the main product of LDR

10

what does reduced NADP (NADPH⁺) enter the LIR with?

takes electrons from the chlorophyll molecule with it

11

why is reduced NADP (NADPH⁺) important?

it is a further source of chemical energy for the plant

12

what are the 2 uses of the oxygen by-prouct from the photolysis of water?

1. respiration
2. diffuses out of the leaf as a waste product of photosynthesis