Photosynthesis

Question 1

Light dependent reactions

Answer 1

Light trapped
Energy produced as ATP and reduced NADP
Transferred

Question 2

Light independent reaction

Answer 2

Calvin cycle
Fixation of carbon dioxide to produce complex organic molecules

Question 3

Primary pigments

Answer 3

Absorbs light
Reaction center
Chlorophyll a

Question 4

Accessory pigments

Answer 4

Absorbs different wavelength of light
Light energy passed to primary pigments

Question 5

Chlorophyll

Answer 5

Absorbs red and violet light
Reflects green

Question 6

Carotenoids

Answer 6

Absorbs blue - violet right
Reflects red

Question 7

Photosynthetic action depends on:

Answer 7

Wavelength of light
What light is absorbed?

Question 8

Calvin cycle

Answer 8

Fixation of CO2 with RUBP
2 x GP (3C)
Reduction ( ATP and H from nadph used )
NADP regenerated
2x TP
1/6 converted to: lipid, protein, glucose
5/6 converted back to RUBP
RUBP regenerated

Question 9

Light dependent reactions:

Answer 9

Cyclic phosphorylation
Non cyclic phosphorylation

Question 10

Non-cyclic phosphorylation

Answer 10

Both photosystem
Light energy trapped
Light energy transferred to primary pigment
Electrons excited
Transported to etc
Releases energy
Pump protons into thylakoid membrane
ATP synthase rotates
ADP + pi → ATP
Water molecule breaks down H2o→ 2e+ 1/2 O2+ 2h
Electrons: replaces electrons lost by PS Il
Oxygen: waste gas
Hydrogen: reduces NADP
Photo activation
Etc and ATP synthesis
Photolysis

Question 11

Cyclic phosphorylation

Answer 11

Only PS ll
Photo activation
ATP synthesis
Photolysis
Electrons returned to original ps

Question 12

Factors affecting photosynthesis

Answer 12

Light intensity
Carbondioxide concentration
Temperature

Question 13

Stroma

Answer 13

Ribosomes
Enzymes
Starch grains

Question 14

Lamellae

Answer 14

Membrane arranged to produce fluid filled sacs
Etc