Photosynthesis

Question 1

What is the energy absorbed by photosynthetic pigments used for

Answer 1

Excites electrons which are then passed through electron transport chain releasing energy for ATP synthase to generate ATP.
Also used in photolysis to spilt water into oxygen and hydrogen.

Question 2

What happens to light that is not absorbed

Answer 2

Transmitted or reflected

Question 3

What does the absorption spectra show

Answer 3

Shows the wavelengths of light absorbed by each pigment.

Question 4

What does the action spectra show

Answer 4

The rate of photosynthesis at different wavelengths of light.

Question 5

Role of carotenoids

Answer 5

Extend the range of wavelengths absorbed and pass the energy to chlorophyll for photosynthesis.

Question 6

What colours do chlorophyll mainly absorb

Answer 6

Blue and red

Question 7

What happens to the hydrogen that is produced from the photolysis of water

Answer 7

Transferred to the coenzyme nadp to become NADPH2

Question 8

What is the first stage of photosynthesis called

Answer 8

Light dependant stage

Question 9

What are limiting factors of photosynthesis

Answer 9

Light intensity
Temperature
C02 concentration

Question 10

What fixes carbon dioxide to RuBP

Answer 10

RuBisCO enzyme

Question 11

What is the CO2 acceptor

Answer 11

RuBP

Question 12

What is the second stage of photosynthesis

Answer 12

Carbon fixation or Calvin cycle

Question 13

How is G3P formed

Answer 13

3PG is phosphorylated by ATP and combined with the hydrogen from NADPH2 to form G3P.

Question 14

What is G3P used to regenerate

Answer 14

RuBP

Question 15

What is G3P converted into

Answer 15

Sugars then converted into starch (storage carb) and cellulose (structural carb)