Lesson 5.2.1

5.2.1 Overall photosynthesis and ATP Quiz: Pearson Edexcel Biology A (Salters-Nuffield), Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.2.1, Overall photosynthesis and ATP: 20 multiple choice questions for the Pearson Edexcel Biology A (Salters-Nuffield) (9BI0), Unit 5: On the Wild Side, written with Revision Ninja.

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The 20 questions

  1. What is the overall word equation for photosynthesis?

    • Water + glucose gives carbon dioxide + oxygen
    • Carbon dioxide + oxygen gives glucose + water
    • Glucose + oxygen gives carbon dioxide + water
    • Carbon dioxide + water, in light, gives glucose + oxygen

  2. In photosynthesis, what is the source of the oxygen released?

    • Carbon dioxide, split by the Calvin cycle
    • Water, split during the light-dependent reactions
    • Chlorophyll, which is destroyed to release oxygen
    • Glucose, broken down in the light

  3. What does the overall photosynthesis reaction require energy from?

    • Nuclear reactions within the chloroplast
    • Chemical energy in the form of ATP stored in the soil
    • Light, which splits the strong bonds in water molecules
    • Heat from the surrounding air

  4. Which molecule is the immediate energy currency of cells?

    • Oxygen
    • Chlorophyll
    • ATP
    • Glucose

  5. Why does hydrolysis of ATP provide an immediate supply of energy?

    • It splits water to produce oxygen
    • It forms glucose directly from carbon dioxide
    • It releases energy when a phosphate is removed
    • It stores large amounts of carbon dioxide for later use

  6. Phosphorylation of ADP to form ATP requires:

    • Energy release
    • Oxygen as a reactant
    • Energy input
    • Glucose as a product

  7. Which statement about the overall photosynthesis equation is correct?

    • Light is released as a product
    • Hydrogen from water is fixed into glucose with CO2
    • Glucose is used up in light to release oxygen
    • Carbon dioxide is split by light to give oxygen

  8. Which pigment captures light energy in photosynthesis?

    • Haemoglobin
    • Starch
    • Chlorophyll
    • Cellulose

  9. A plant is placed in light and carbon dioxide is supplied. Which products form during photosynthesis?

    • Carbon dioxide and water only
    • Starch and nitrogen
    • Glucose and carbon monoxide
    • Glucose and oxygen

  10. In a calculation, a plant absorbs 6 molecules of carbon dioxide. How many molecules of oxygen are released?

    • 6
    • 12
    • 1
    • 3

  11. Why is ATP described as a short-term energy store rather than a long-term one?

    • It is used up quickly and must be continually regenerated
    • It is stored in large quantities in seeds for years
    • It is converted directly into oxygen
    • It is only formed in the dark

  12. A student says photosynthesis releases energy as a product. Which evaluation is correct?

    • Incorrect: energy is stored in glucose from light
    • Correct, because light is released as heat during photosynthesis
    • Correct, because oxygen is an energy source for the plant
    • Incorrect, because photosynthesis releases no gases at all

  13. Why is photosynthesis described as the primary process underpinning most ecosystems?

    • It produces carbon dioxide that all animals need to breathe
    • It converts light energy into food energy for food chains
    • It removes all oxygen from the air
    • It produces only water as a product

  14. What is the role of carbon dioxide in photosynthesis?

    • It is a product that is released as oxygen
    • It is a source of light energy
    • It is a catalyst that is unchanged and not needed
    • It is a reactant that is fixed into glucose

  15. A plant has its supply of water cut off. Which process of photosynthesis is most directly affected?

    • Transpiration through the stomata only
    • Phosphorylation of glucose to form starch
    • Photolysis of water, supplying electrons
    • Respiration of glucose in the mitochondria

  16. A student measures the mass of glucose produced per hour under different light intensities. Which variable is the dependent variable?

    • The temperature of the room, kept constant
    • The light intensity, the independent variable
    • The mass of glucose produced per hour
    • The type of plant used in the investigation

  17. Why does photosynthesis provide energy for the food webs described in ecology?

    • Oxygen made in photosynthesis is eaten directly by all consumers
    • Glucose and organic molecules pass energy to consumers
    • Light is absorbed by animals to make food
    • Water from photosynthesis is the only food for animals

  18. A plant makes 180 g of glucose by photosynthesis. What mass of oxygen is released, given that glucose is C6H12O6 (180 g/mol) and O2 is 32 g/mol?

    • 96 g
    • 192 g
    • 32 g
    • 180 g

  19. Why is photosynthesis described as an endergonic process?

    • It occurs spontaneously with no energy input at all
    • It needs an energy input to build glucose
    • It releases all of its energy as heat to the surroundings
    • It releases more energy than it uses in its reactions

  20. Which statement about ATP and photosynthesis is correct?

    • ATP is made in light and used to fix carbon dioxide
    • ATP is the source of light energy for photosynthesis
    • ATP is not used in photosynthesis at all
    • ATP is made from oxygen and glucose without any energy input

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