Unicellular and Multicellular Organisms

Which best describes the main job of most cells in multicellular organisms?

• Cells work to keep themselves alive.
• Cells work to keep the organism alive.
• Cells work to release needed materials.
• Cells work to store unneeded materials.

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Which organism performs all life processes in one cell?

• grass
• bacteria
• mushroom
• butterfly

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Which organisms are capable of surviving as a single cell?

• bacteria
• humans
• plants
• fish

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Which best explains why humans are multicellular organisms?

• Human cells are too small to function alone.
• Human cells join together to form one large cell.
• Humans need many cells to carry out life processes.
• Humans have many systems that perform the same function.

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Molly is reading a book in science class. She reads one sentence that says, “This organism is capable of surviving as a single cell.” Which organism is she most likely reading about?

• amoeba
• flower
• mushroom
• insect

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How are algae able to survive?

• The algae get energy from other algae.
• The algae do not require energy to survive.
• The single cell controls all the algae’s life processes.
• Other multi-celled organisms provide food for the algae.

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Why do humans require many different types of cells to survive?

• Human cells are identical and work together to perform the same function.
• Human cells are specialized and work together to perform the same function.
• Human cells are identical and work independently to perform different functions.
• Human cells are specialized and work independently to perform different functions.

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Which is the best way to classify grasshoppers?

• Grasshoppers are multi-celled organisms because they are made up of one cell that carries out all of their life processes.
• Grasshoppers are single-celled organisms because they are made up of one cell that carries out all of their life processes.
• Grasshoppers are single-celled organisms because they are made up of many cells that carry out all of their life processes.
• Grasshoppers are multi-celled organisms because they are made up of many cells that carry out all of their life processes.

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Which statement best describes a bacterial cell?

• It contains more than one cell.
• It is a complete organism.
• It is part of a larger organism.
• It contains different kinds of cells.

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A class is modeling the differences between a unicellular organism and a multicellular organism. Which example is a model of a unicellular organism?

• a student passing out water to a group
• a student getting cereal from the cabinet
• two students collecting trash from a group
• four students working together to move a desk

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