A-Level Biology May/June 2025 Q8(a): Outline the characteristic features of the kingdom Fungi.

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  Fungi are a distinct kingdom of organisms with several characteristic features:

  • They are eukaryotic, meaning their cells possess a true nucleus and membrane-bound organelles.
  • Fungi are heterotrophic, specifically saprotrophic, obtaining nutrients by secreting extracellular enzymes onto dead organic matter and absorbing the digested products. They do not contain chlorophyll or chloroplasts.
  • Their cell walls are made of chitin, not cellulose.
  • The body of a multicellular fungus consists of a network of fine threads called hyphae, which form a mass known as a mycelium.

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  How the marks are awarded

  • MP1 — The answer correctly identifies fungi as 'eukaryotic' and explains this means they have a 'true nucleus'.
  • MP3 — The answer states that fungi are 'heterotrophic' and provides a correct description of their saprotrophic mode of nutrition, which involves absorbing nutrients.
  • MP4 — The answer correctly states that the fungal cell wall is composed of 'chitin'.
  • MP6 — The answer accurately describes the body structure as being composed of 'hyphae' which form a 'mycelium'.

  Common mistakes

  • Confusing fungi with plants by stating their cell walls are made of cellulose.
  • Incorrectly stating that fungi are photosynthetic or autotrophic, which would imply the presence of chlorophyll.
  • Describing fungi as prokaryotic, which is a fundamental error as they are a kingdom of eukaryotes.
  • Forgetting to mention the basic body structure of hyphae/mycelium, which is a key distinguishing feature of multicellular fungi.

  Examiner tip: For classification questions, create a summary table comparing the key features (e.g., cell type, cell wall, nutrition, body plan) of all five kingdoms to easily recall and contrast them under exam pressure.

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