Lesson 5.2.2

5.2.2 Light-dependent reactions Quiz: Pearson Edexcel Biology, Unit 5

20 questions

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Lesson 5.2.2, Light-dependent reactions: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 5: On the Wild Side, written with Revision Ninja.

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The 20 questions

  1. Where do the light-dependent reactions of photosynthesis occur in a chloroplast?

    • Intermembrane space
    • Stroma matrix
    • Thylakoid membranes
    • Outer membrane

  2. What happens to chlorophyll electrons when they absorb light energy?

    • They are destroyed
    • They enter stroma
    • They split water
    • They become excited

  3. What process provides electrons to replace those lost by photoionised chlorophyll?

    • Photolysis of water
    • Hydrolysis of ATP
    • Reduction of NADP
    • Fixation of CO2

  4. Which gas is released as a by-product of photolysis of water?

    • Nitrogen
    • Hydrogen
    • Oxygen
    • Carbon dioxide

  5. What molecule is produced from ADP and inorganic phosphate during photophosphorylation?

    • ATP
    • Reduced NADP
    • GALP
    • Glucose

  6. What is the primary role of reduced NADP in the Calvin cycle?

    • Phosphorylating RuBP
    • Fixing carbon dioxide
    • Reducing GP
    • Oxidising GALP

  7. What is the main function of chlorophyll in light-dependent reactions?

    • Synthesising RuBP
    • Fixing carbon dioxide
    • Absorbing light energy
    • Splitting glucose

  8. Which light-dependent process releases oxygen gas in photosynthesis?

    • ATP synthesis
    • Photolysis of water
    • Carbon fixation
    • Decarboxylation

  9. Why is ATP formation in photosynthesis termed photophosphorylation?

    • Uses light energy
    • Occurs in stroma
    • Requires oxygen gas
    • Breaks down ATP

  10. In a calculation, 4 electrons are needed to reduce 2 NADP molecules. How many water molecules must be photolysed to supply these electrons?

    • 2
    • 1
    • 4
    • 8

  11. What are ADP and inorganic phosphate used to produce during photosynthesis?

    • ATP
    • Glucose
    • Reduced NADP
    • RuBP

  12. Which products decrease in concentration when chloroplasts are placed in total darkness?

    • Glucose and water
    • Ribulose bisphosphate
    • Carbon dioxide and oxygen
    • ATP and reduced NADP

  13. Where are protons pumped during electron transport in thylakoid membranes?

    • Into thylakoid space
    • Into chloroplast stroma
    • Out of chloroplast
    • Into cell cytoplasm

  14. What is the primary role of photosystems in photosynthesis?

    • Fixing carbon dioxide
    • Storing starch grains
    • Pumping protons out
    • Capturing light energy

  15. Which process produces ATP during the light-dependent reactions of photosynthesis?

    • Decarboxylation
    • Photophosphorylation
    • Photolysis
    • Phosphorylation

  16. Which two substances from the light-dependent reactions power the Calvin cycle?

    • ADP and NADP
    • Oxygen and water
    • ATP and reduced NADP
    • Glucose and carbon dioxide

  17. What is the main role of the photolysis of water during photosynthesis?

    • Producing glucose
    • Absorbing light energy
    • Replacing chlorophyll electrons
    • Fixing carbon dioxide

  18. When investigating how light intensity affects plant oxygen production, which variable must be controlled?

    • Oxygen volume
    • Light wavelength
    • Water temperature
    • Light intensity

  19. Photolysis of 36 water molecules releases how many molecules of oxygen?

    • 9
    • 36
    • 18
    • 72

  20. Which primary photosynthetic pigment absorbs red and blue light most strongly?

    • Xanthophyll
    • Carotene
    • Chlorophyll a
    • Phycocyanin

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