Photosynthesis

Question 1

How are chloroplasts adapted to capturing sunlight and carrying out photosynthesis?

Answer 1

° thylakoids membrane = high SA
° network of proteins hold chlorophyll in very precise manner
° granal membranes have enzymes attached to manufacture ATP
° contain DNA and ribosomes to make proteins needs for LDR

Question 2

Where does the light-independent reaction take place?

Answer 2

Stroma of the chloroplasts

Question 3

Where does the light dependant reaction take place?

Answer 3

Thylakoids of chloroplasts

Question 4

Briefly outline the stages of the Calvin cycle (LIR)

Answer 4

1. CO2 diffuses into stroma
2. CO2 is fixed to RuBP (5C)
3. CO2 + RuBP = 2 x GP
4. ATP and reduced NADP reduce the GP to TP
5. NADP is re-formed and goes back to LDR to accept more H

Question 5

What is a limiting factor?

Answer 5

The rate of photosynthesis being affected by one factor with the least favourable value

Question 6

List some examples of possible limiting factors in photosynthesis.

Answer 6

• light intensity
• CO2 levels
• temperature -> enzymes!
• water

Question 7

Briefly outline the stages of the light dependant reaction (LDR).

Answer 7

•Light energy absorbed the chlorophyll