photosynthesis

Question 1

what is the function of pigments?

Answer 1

absorb light energy for photosynthesis

Question 2

what is the absorption spectrum?

Answer 2

a graph to show the amount of light that is absorbed at different wavelengths

Question 3

what is the action spectrum?

Answer 3

a graph to show the rate of photosynthesis at different wavelengths

Question 4

what is the significance of the shapes of the absorption and action spectrum?

Answer 4

similar shapes which shows the wavelengths that’s being absorbed is being used in photosynthesis

Question 5

what is the role of a photosystem?

Answer 5

absorb light energy, made up of the antenna complex and reaction centre

Question 6

what is the antenna complex made up of?
what does it do?

Answer 6

accessory pigments
harvests light energy and passes the excitation to the reaction centre

Question 7

what is in the reaction centre?

Answer 7

chlorophyll a

Question 8

what happens in the reaction centre?

Answer 8

excited chlorophyll a molecules emit one electron

Question 9

where does the light dependent stage take place?
what does it require?

Answer 9

thylakoid membranes
light energy and water

Question 10

what does the light dependent stage produce?

Answer 10

reduced NADP
ATP
oxygen

Question 11

what is water split into during photolysis of water?

Answer 11

hydrogen ions, electrons and oxygen

Question 12

what does each molecule do after photolysis of water?

Answer 12

h ions used to reduce NADP to reduced NADP
electrons used to replace those lost in photosystem 2

Question 13

what is photophosphorylation?

Answer 13

phosphorylation of ATP using light energy

Question 14

what photosystem does cyclic photophosphorylation use?
what is cyclic …

Answer 14

1
excited electrons pass from electron acceptors to electron carrier and back to ps1

Question 15

where does the light independent stage occur

Answer 15

stroma

Question 16

how is glycerate-3-phosphate produced?

Answer 16

CO2 is fixed to/ taken in by ribulose bisphosphate by the enzyme Rubisco

Question 17

how is triose phosphate made?

Answer 17

ATP and reduced NADP used to reduce glycerate-3-phosphate

Question 18

how is ribulose bisphosphate regenerated?

Answer 18

ATP

Question 19

what happens if its dark?

Answer 19

light dependent stage stop as no light energy
stops a glycerate-3-phosphate as no ATP or reduced NADP to reduce GP to TP

Question 20

what is the definition of a limiting factor?

Answer 20

one in shortest supply/closest to minimal value, prevents any increase in rate of photosynthesis

Question 21

examples of factors affecting PS

Answer 21

wavelengths, light intensity,
co2 conc
temperature

Question 22

what do plants need magnesium for?

Answer 22

chlorophyll

Question 23

what does a plant need nitrogen for?

Answer 23

synthesis of proteins, nucleic acids and chlorophyll