PHOTOSYNTHESIS- INCORRECT EXAM QUESTIONS

Question 1

In TLC, why do you need to hold the plate carefully by the edges and avoid damaging the surface of the plate?

Answer 1

• so movement of spots isn’t affected by damage

or

• so that plates aren’t contaminated by fingerprints

Question 2

in TLC, why do you make sure the plate doesn’t touch the sides of the jar anywhere else?

Answer 2

• because condensation on the walls of the jar may affect the movement of the spots

Question 3

Why is it beneficial to move as fast as possible when extracting the pigments to use for TLC?

Answer 3

• to reduce contamination of photosynthetic pigments

or

• to reduce evaporation of propane

Question 4

Why does temperature have a greater effect on the LIR?

Answer 4

• its controlled by enzymes (RuBisCO)
• increase temp means more enzyme-substrate complexes are formed so increased ROR
• above a certain temp enzymes become denatured

Question 5

What’s a limiting factor (2 marks)

Answer 5

• the factor that will determine the rate of photosynthesis at lower levels