photosynthesis

Question 1

photosynthesis

Answer 1

•the process by which green plants use light, carbon dioxide and water to make glucose and oxygen

Question 2

steps in photosynthesis

Answer 2

1. Sunlight absorbed by chlorophyll
   2: energy from this used to split water into protons, electrons & oxygen
   3: oxygen released into atmosphere
   4: protons go to proton pool
   5: electrons pass to chlorophyll
   6: electron on the chlorophyll becomes energised by light
   7: electron mix with protons from proton pool & carbon dioxide from atmosphere to form glucose

Question 3

light stage

Answer 3

•needs light to happen
•doesn’t need enzymes
•occurs quickly

Question 4

dark stage

Answer 4

•doesn’t need light to happen
•needs enzymes
•occurs slower

Question 5

atp

Answer 5

•adenosine triphosphate
•ADP + P + energy = ATP

Question 6

NADPH

Answer 6

•NADP+ + 2e- + H+ = NADPH

Question 7

NADPH function

Answer 7

•NADPH can transport electrons and protons in the form of Hydrogen

Question 8

ATP function

Answer 8

•can transport and release energy

Question 9

light stage (cyclic) steps

Answer 9

1: Light split water into protons, electrons & oxygen
2: protons go to proton pool, oxygen released into atmosphere
3: Light absorbed by chlorophyll & energy pass to an electron
4: electron is passed from acceptor to acceptor releasing energy as it goes
5: ATP formed from released energy
6: electron returns to chlorophyll and repeat

Question 10

light stage (non cyclic) steps

Answer 10

•same as cyclic except
•electron joins a proton (from proton pool) and NADP+ to form NADPH

Question 11

what is the point of the light stage

Answer 11

•to make the products ATP and NADPH for the dark state

Question 12

dark stage

Answer 12

•ATP, NADPH and Carbon dioxide aremixed together using enzymes to form glucose
• ATP supplies energy
•NADPH supplies Hydrogen
•Carbon dioxide supplies carbon and oxygen

Question 13

a molecule that can provide electrons during photosynthesis

Answer 13

•water