Multicellular and Unicellular Organisms › Revision notes
Multicellular and Unicellular Organisms — Revision notes
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Quick recap
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Brain dump
Before you look at anything else, write down everything you can remember about this lesson: key words, facts, examples. Spelling doesn't matter. Then see which of the 10 key terms you remembered.
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Ones you missed. Read these, then try again tomorrow:
Key terms
- Unicellular organism
- A living thing made of a single cell that carries out all seven life processes by itself
- Multicellular organism
- A living thing made of many specialized cells working together
- Tissue
- A group of similar cells working together to perform a specific job
- Organ
- A structure made of different tissues working together on a shared task
- Organ system
- A group of organs working together to carry out a major job for the organism
- Adaptation
- A special feature or characteristic that helps an organism function and survive in its environment
- Chloroplast
- A cell structure found in plant leaves packed to trap sunlight for photosynthesis
- Cell membrane
- The outer layer of a cell, controlling what substances go in and out
- Cytoplasm
- The material inside a cell where chemical reactions happen
- Cell wall
- A tough outer layer, found in plant cells, yeast and bacteria, that protects the cell and holds its shape
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What this lesson covers
How well do you know each one? Be honest: red means go back over it.
- Define unicellular and multicellular organisms and give examples of each
- Correct the common misconception about what unicellular actually means
- Describe the organisation hierarchy from cell to tissue to organ to organ system
- Explain how the stomach works as an organ made of several tissues
- Describe adaptations that let unicellular organisms such as amoeba, yeast and bacteria survive alone
- Explain why a single bacterium counts as a living organism
Test yourself
Cover the answer, say it out loud, then check the full quiz on the lesson page.
- What makes a single bacterial cell count as a living organism?
- Roughly how many cells is an adult human body built from?
- Is a blood vessel an organ, or is it a tissue?
Topic quiz
12 questions on this topic only — not mixed with anything else, one at a time.
Question 1 of 12
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Spelling challenge
Read the definition, then type the correct spelling of the term. Uses the same terms as above.
Score: 0/0