Chapter 11 - Photosynthesis

Question 1

what process descibes the absorbtion of a photon by chlorophyll?

Answer 1

photoionisation

Question 2

How does photoionisation result in the production of ATP and reduced NADP?

Answer 2

When the photoionised electron is released it moves down the electron transfer chain resulting in the movement of protons across a chloroplast membrane through ATP snythase - NADP is final electron acceptor

Question 3

How is the chlorophyll regenerated?

Answer 3

The photolysis of water into protons, electrons (into chloroplast) and oxygen

Question 4

Why is the light dependent step required for the light independent step?

Answer 4

Because both the reduced NADP and ATP produced in the light dependent step are used to form simple sugars

Question 5

Why is the light dependent step required for the light independent step?

Answer 5

Because both the reduced NADP and ATP produced in the light dependent step are used to form simple sugars

Question 6

How is CO2 used in the Calvin Cycle?

Answer 6

CO2 reacts with Ribulose Bisphosphate (RuBP) to form 2 Glycerate-3-phosphate molecules (GP) - Catalysed by rubisco

Question 7

What happens to GP in the Calvin Cycle?

Answer 7

ATP and Reduced NADP turn it into Triose Phosphate (TP)

Question 8

How is TP used in the Calvin Cycle

Answer 8

TP is used to regenerate the RuBP molecule whilst also a small amount of it is converted into useful organic substances

Question 9

Which environmental factors limit photosynthesis rate?

Answer 9

Light levels - linear (plateau)
CO2 concentration - linear (plateau)
Temperature - bell curve graph