Photosynthesis

Question 1

Define photosynthesis

Answer 1

carbon compounds, light energy

Question 2

Which has the shortest wavelength? Violet/Red

Answer 2

Violet

Question 3

Describe the effectiveness of different light absorption by chlorophyll

Answer 3

Blue light has higher absorption than red light

Green light is reflected

Question 4

How is oxygen produced in photosynthesis

Answer 4

photolysis of water

light dependent

Question 5

List some limiting factors

Answer 5

Temp., light intensity, CO2 conc.

Question 6

Draw an absorption and action spectrum

Answer 6

absorption: absorption of light by chlorophyll
action: rate of photosynthesis
absorption under action
peak in blue, lower peak in red
y-axis: % max rate of photosynthesis, % of light absorbance
x-axis: wavelength (nm)
blue light in 400 nm

Question 7

Changes to atmosphere, ocean, rock deposition from photosynthesis

Answer 7

2% –> 20% oxygen level
ozone layer, protect from UV radiation
oxidised compounds in ocean e.g. CO2, Iron oxides (sediments)

Question 8

Where does light dependent reaction occur?

Answer 8

thylakoid membrane, thylakoid space

Question 9

Where does light-independent/calvin cycle occur?

Answer 9

stroma