Topic 5

Question 1

Where does the light- dependant and light independent reaction occur in plants ?

Answer 1

Light dependant- in the thylakoids of chloroplast
Light independent- storms of plants

Question 2

Explain the role of light in photo ionisation

Answer 2

Chlorophyll molecules absorb energy from photons of light.
This ‘excites’ 2 electrons (raises them to a higher energy level ) , causing them to be released from the chlorophyll

Question 3

What are the two main stages involved in production of ATP in light dependant reaction ?

Answer 3

Electron transfer chain
Chemiosmosis

Question 4

What happens in the electron transfer chain ?

Answer 4

• electron released from chlorophyll
  -move down a series of carrier proteins embedded in thylakoid membrane
• undergo a series of redox reactions
  -which releases energy