This quiz contains a mix of SL and HL questions

Q1 & 2: The image below shows a chloroplast.

chloroplast image - wikimedia

 Wikimedia Commons (edited)
GNU Public License

1. What process occurs in location X?

  • A. Excitation of electrons by photosystem II
  • B. Carboxylation of ribulose bisphosphate
  • C. Regeneration of NAD
  • D. Photolysis of water

2. What process does not occur in location Y?

  • A. Photolysis of water
  • B. Reduction of NADP
  • C. Glycerate 3-phosphate (GP) is reduced to triose phosphate (TP)
  • D. Proton gradient is used to generate ATP

Q3 & 4. The image shows the pigments present in a plant such as spinach, identified using chromotography:

 

chromatography of plant pigments

 

 Flo~Commonswiki
CC-BY-SA 2.5
3. Which of the pigments is the most soluble in the given solvent?
  • A. Lutein
  • B. Chlorophyll b
  • C. Chlorophyll a
  • D. Phaeophytin

4. The table gives the Rf values of some of the pigments. Which of the pigments would be found at position X?

  Rf value
A 0.98
B 0.81
C 0.59
D 0.28
5. The diagram shows an absorption spectrum for plant pigments.

absorbance graph for chlorophyll

  

What is the colour of light that is maximally absorbed at approx. 675 nm?

  • A. Red
  • B. Yellow
  • C. Green
  • D. Blue

Q6+7: A student investigated how light intensity affected the rate of photosynthesis using algae trapped in small alginate balls as shown in the image. Trapping the algae does not alter their rate of photosynthesis.

A bright light was placed near the boiling tube. The rate was measured by timing how long it took the algal balls to rise from the bottom of the test tube to the surface of the water.

Algal Balls in boiling tube

6. Name the gas produced by the algae and the process that produces the gas.

  Name of gas Name of process
A Carbon dioxide photolysis
B air photosynthesis
C oxygen photolysis
D oxygen respiration

7. The student moved the lamp different distances from the algal balls and recorded the time taken for the balls to rise from the bottom of the test tube to the surface of the water. The rate of photosynthesis was calculated.

rate of photosynthesis graph

  

As the light intensity is increased above 4 arbitrary units, the rate of photosynthesis does not increase significantly. Why?

  • A. The light intensity is not high enough
  • B. The wavelength of the light changes with intensity
  • C. Another factor becomes limiting
  • D. Oxygen production stops at this point

8. What is the main source of carbon compounds in photosynthesizing organisms?

  • A. Light dependent reactions
  • B. Metabolic pathways
  • C. Intermediates in the Calvin cycle
  • D. Mineral nutrients from soil

9. What is/are the roles of the structured array of different types of accessory pigment molecules in photosystem I?

I. To emit excited electrons and pass them onto the photosystem II
II. To enhance the efficiency of photosynthesis by enabling a wide range of wavelengths to be absorbed
III. To protect the reaction center chlorophyll a from damage
  • A. II only
  • B. I and III only
  • C. II and III only
  • D. I, II, and III

10. What statements are true regarding cyclic photophosphorylation?

I. More likely to occur when there is limited availability of carbon dioxide
II. More likely to occur when there is limited availability of NADPH
III. Helps to generate ATP using electrons from photosystem I
IV. Only occurs in anaerobic conditions
  • A. II only
  • B. I and III only
  • C. III and IV only
  • D. I, II, III and IV