5.2.1 Photosynthesis

Question 1

autotroph

Answer 1

organism that uses an external energy source and inorganic molecules to make complex organic molecules

Question 2

heterotroph

Answer 2

organism that takes in complex organic molecules which act as a source of energy and as usable carbon compounds

Question 3

requirements for photosynthesis

Answer 3

light, chlorophyll, CO2

Question 4

Factors affecting the rate of photosynthesis

Answer 4

Chlorophyll, CO2, light, water, temperature

Question 5

Where do the light dependant reactions take place

Answer 5

thylakoid membranes

Question 6

Where do the light independant reactions take place

Answer 6

Stroma

Question 7

Name all the parts of the chloroplast

Answer 7

• Outer membrane
• Inner membrane
• Stroma
• Grana
• Thylakoid
• Lipid droplet
• Starch grain
• Lamellae
• Ribosomes

Question 8

Photosystems

Answer 8

funnel-shaped structures found in the thylakoid membrane containing photosynthetic pigments

Question 9

Photosynthetic pigments

Answer 9

substances that can absorb certain wavelengths of light and reflect others in the photosystem. they appear in the colour of wavelengths they are reflecting

Question 10

How do photosystems work

Answer 10

Energy associated by the wavelength of each accessory photosynthetic pigment captures is funneled down to the primary pigment reaction centre which is made of chlorophyll pigment

Question 11

2 forms of chlorophyll-a

Answer 11

P680 & P700 (capturing red light)

Question 12

P680 correlates to which photosystem

Answer 12

PSII

Question 13

P700 correlates to which photosystem

Answer 13

PSI

Question 14

wavelength absorbed by chlorophyll-b

Answer 14

400-500nm and 640nm

Question 15

Which photosystem is chlorophyll-b mainly present in

Answer 15

Mainly in PSII, rarely in PSI

Question 16

name the carotenoid (accessory) pigments

Answer 16

carotene & xanthophyll

Question 17

What processes does the light dependant stage of photosynthesis consist of?

Answer 17

light harvesting, photolysis of water, photophosphorylation, NADPH formation

Question 18

In a LDR, PSII contains an enzyme which in the presence of light can split _____ into ______, _________, and ______ in a process called __________

Answer 18

water, H+ ions, electrons, oxygen, photolysis

Question 19

Photolysis of water balanced equation

Answer 19

2H2O —> 4H+ + 4e- + O2

Question 20

After photolysis of water by the PSII, what happens to oxygen made?

Answer 20

diffused out of stomata or used in respiration

Question 21

After photolysis of water by the PSII, what happens to electrons made?

Answer 21

electons replace those lost by the chlorophyll

Question 22

What are the 2 types of phosphorylation

Answer 22

Non-cyclic and cyclic

Question 23

Differences between non-cyclic and cyclic phosphorylation

Answer 23

Non- cyclic uses PSII & PSI, cyclic only uses PSI. Non-cyclic produces ATP, oxygen and NADPH, cyclic only produces ATP