Single and Multi-Celled Organisms

Select a unicellular organism?

• Bacteria

• Tree

• Flower

• Frog

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Why do multicellular organisms need so many cells?

• They need specialized cells to survive. Specialized cells perform a specific job/function.

• They need many cells to all do the same job/function.

• They need many cells to have a dancing cell party.

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Which best explains why both cats and humans are multicellular organisms?

• They get energy from many food sources.

• They get energy from a single food source.

• They need many different types of cells working together to meet their basic needs.

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Which best explains how a single­-celled organism can survive without other cells?

• They do not need any substance from outside of the cell.

• They are able to perform all necessary functions within one cell

• They do not need to perform more than one function to survive.

Which best explains why amoeba are able to survive without specialized cells?

• Amoeba are able to survive with the help of specialized cells.

• Amoeba are able to survive with the help of other organisms.

• Amoeba are able to survive because they carry out all life functions.

Which statement would most likely be found in an article about multicelled organisms like plants?

• Plants have a simple structure.

• Plants contain only one cell that performs all functions.

• Plants do not need to eat, remove waste, or reproduce.

• Plants contain many specialized cells that perform different functions.

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What makes unicellular organisms unique and simple?

• They can do all life process as one cell.

• They can fly and eat at Zaxby’s.

• They can survive working with other single-celled organisms.

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Which best describes a function of survival that single-­celled organisms cannot perform?

• obtaining nutrients for energy

• grow and develop

• get rid of waste

• specialized cells that perform specific jobs

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A scientist is trying to decide whether an organism is unicellular or

multicellular. Which information would help the scientist most to make

her decision?

• size of the cells of the organism

• what the organism eats

• how many types of cells are in the organism

• how fast the organism grows

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Which characteristic do single-celled organisms and multicellular organisms have in common?

• Both have cells with specialized functions for each life process.

• Both perform all life processes within one cell.

• Both have a way to get rid of waste materials.

• Both are able to make food from sunlight.