Describe four features of protoctists.
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Protoctists are a diverse group of microscopic organisms. Examples include Amoeba, Chlorella and Plasmodium.
Model answer (4 marks)
Protoctists are single‑cellular organisms.
Protoctists are microscopic.
Protoctists are eukaryotic and possess a nucleus.
Some protoctists have chloroplasts and can photosynthesise, while others lack chloroplasts and exhibit animal‑like or plant‑like features.
Protoctists are microscopic.
Protoctists are eukaryotic and possess a nucleus.
Some protoctists have chloroplasts and can photosynthesise, while others lack chloroplasts and exhibit animal‑like or plant‑like features.
Examiner tips
- Use the exact terms: single‑cellular, microscopic, eukaryotic, nucleus, chloroplasts, photosynthesise.
- Include both plant‑like and animal‑like examples to show breadth.
- Keep each feature as a separate sentence for clarity.
Common mistakes
- Confusing protoctists with multicellular organisms; forgetting the microscopic nature.
- Using “prokaryotic” instead of “eukaryotic”.
Mark scheme (4 marks)
- Protoctists are single-celled / unicellular organisms
- Protoctists are microscopic
- Protoctists have a nucleus / are eukaryotic cells
- Some protoctists have chloroplasts and can photosynthesise (e.g. Chlorella) whilst others do not (e.g. Amoeba / Plasmodium) / they show animal-like or plant-like features
Key terms in this question
Related
- All Pearson Edexcel International GCSE Biology (4BI1) revision notes →
- How to answer a "Describe" question →
- Decode the mark scheme abbreviations →
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