Photosynthesis

Question 1

Explain the role of water in photosynthesis.(3)

Answer 1

H20 > 2e- + 2H+ 0.5 O2
1.provide electrons/H+
2.required for reduction of NADP
3.replace electrons lost by chlorophyll

Question 2

Explain why the conc of RuBP increased with decreasing CO2. (2)

Answer 2

1.TP converted to RuBP
2.not enough co2 available to combine with RuBP

Question 3

In the LIR the scientist increased conc of CO2 however RuBP and GP amounts remained same. Why.(2)

Answer 3

1.limited temp
2.limited enzyme
3.limited RuBP

Question 4

How is light converted to chemical energy.(3)

Answer 4

1.excitation of electrons
2.provides electron carrier
3.to make ATP

Question 5

Explain the reduce in CO2 uptake.(3)

Answer 5

1.less TP converted to RuBP
2.less GP converted to TP
3. Co2 combines with RuBP

Question 6

Importance of light in photosynthesis.

Answer 6

1.provides energy for reduction of NADP/ LDR/ LIR

Question 7

Describe how NADP is reduced.(2)

Answer 7

1.photolysis
2.electrons

Question 8

Expain why the addition of ADP and Pi caused the dye to change more rapidly.(2)

Answer 8

1.ADP levels are a limiting factor
2.ATP made from ADP and Pi

Question 9

Explain why RuBP increases and GP decreases with lower Co2 levels.

Answer 9

1.Less CO2 used to form GP
2. Less CO2 combined with RuBP to form GP

Question 10

Why glucose conc decreases

Answer 10

Used in respiration

Question 11

How does lack of light cause decrease in GP.

Answer 11

1.less reduced NADP and ATP available
2.less GP used to convert to RuBP