AQA GCSE Biology

Photosynthesis

AQA GCSE Biology revision on Photosynthesis. Aligned to the AQA GCSE Biology 8461 specification. This bank has 25 practice questions on this topic.

Sample questions (3 of 25)

  1. Question 1

    Which two reactants does photosynthesis need?

    • A) Oxygen + glucose
    • B) Water + carbon dioxide
    • C) Water + oxygen
    • D) Glucose + nitrogen
    Show answer

    Answer: Water + carbon dioxide

    Equation: CO2 + H2O -> glucose + O2, with light energy absorbed by chlorophyll. Plants absorb water through roots and CO2 through stomata in leaves. Oxygen is released as a waste product.

  2. Question 2

    What gas do plants release as a waste product of photosynthesis?

    • A) Carbon dioxide
    • B) Nitrogen
    • C) Oxygen
    • D) Hydrogen
    Show answer

    Answer: Oxygen

    Photosynthesis splits water molecules - the hydrogen goes into making glucose, the oxygen is released through stomata. Plants are the main source of atmospheric oxygen.

  3. Question 3

    Where in a plant cell does photosynthesis happen?

    • A) Nucleus
    • B) Chloroplasts
    • C) Mitochondria
    • D) Cell wall
    Show answer

    Answer: Chloroplasts

    Chloroplasts are plant-cell organelles packed with the green pigment CHLOROPHYLL. Chlorophyll absorbs LIGHT energy (especially red + blue wavelengths; reflects green - that's why plants look green). Most abundant in palisade mesophyll cells of leaves - the leaf's main photosynthesis tissue.

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