DP Biology (first assessment 2025)

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Question 22M.2.SL.TZ1.b

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Date May 2022 Marks available [Maximum mark: 5] Reference code 22M.2.SL.TZ1.b
Level SL Paper 2 Time zone TZ1
Command term Describe Question number b Adapted from N/A
b.
[Maximum mark: 5]
22M.2.SL.TZ1.b

Describe how leaf cells make use of light energy.

[5]

Markscheme
  1. leaf cells contain chloroplasts;
  2. light is absorbed by chlorophyll (in chloroplasts);
  3. other pigments absorb different wavelengths;
  4. light energy is used in photosynthesis;
  5. (light is needed) to combine water and carbon dioxide/fix carbon dioxide;
  6. carbon compounds/organic compounds/glucose/starch/carbohydrate are produced;
  7. blue and red light is absorbed;
  8. perform photolysis
    OR
    split water molecules;

Wavelengths accepted for mpg.

Examiners report

Generally speaking, students know how leaf cells make use of light energy; at least three marks were usually gained. Some candidates made the answer too complex and involved, when a simple straight-forward answer would have been better.

Syllabus sections