3.3 Light-independent reaction

Question 1

EXAM QUESTION:

During photosynthesis, oil-palm trees convert carbon dioxide into organic substances. Describe how (6)

Answer 1

1. Carbon dioxide combines with ribulose
   bisphosphate/RuBP;
2. Produces two molecules of glycerate (3-)phosphate/GP;
3. Reduced to triose phosphate/TP;
4. Using reduced NADP;
5. Using energy from ATP;
6. Triose phosphate converted to other organic substances/
   named organic substances/ribulose bisphosphate;
7. In light independent reaction/Calvin cycle;

Question 2

EXAM QUESTION:

During the light-independent reaction of photosynthesis, carbon dioxide is converted into organic substances. Describe how. (6)

Answer 2

1. Carbon dioxide combines with ribulose
bisphosphate/RuBP;
2. Produces two glycerate (3-)phosphate/GP;
3. GP reduced to triose phosphate/TP;
4. Using reduced NADP;
5. Using energy from ATP;
6. Triose phosphate converted to
glucose/hexose/RuBP/ ribulose
bisphosphate/named organic substance;

Question 3

What are used to reduce CO2? (2)

Why does it stop in absence of light, despite being light-independent?

Answer 3

NADPH and ATP

Requires products of light-dependent reaction

Question 4

Process - Calvin cycle (6)

Answer 4

1. Carbon dioxide combines with RuBP
2. Produces 2 molecules GP
3. Reduced to TP
4. Using reduced NADP
5. Using energy from ATP
6. TP converted to organic substances/glucose

Question 5

Where does it occur?

Answer 5

Stroma