Unicellular and Multicellular Organisms

White-tailed deer have many body systems that work together to perform the functions necessary for survival. Which best describes the white-tailed deer?

• It is an organism with no cells.

• It is an organism with many cells.

• It is an organism with only one cell.

• It is an organism with only two cells.

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Which statement would most likely be found in an article about multi-celled 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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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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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?

• a mushroom

• a bacteria

• an insect

• a flower

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How are multi-celled organisms different from single-celled organisms?

• Multi-celled organisms must reproduce.

• Multi-celled organisms must obtain energy.

• Multi-celled organisms have microscopic body structures.

• Multi-celled organisms have specialized cells to perform life functions.

How are multi-celled and single-celled organisms different?

• Multi-celled organisms need energy to survive, while single-celled organisms need no energy to survive.

• Single-celled organisms can be seen without using a microscope, while multi-celled organisms are microscopic.

• Multi-celled organisms have large numbers of specialized cells to perform a variety of life functions, while single-celled organisms complete life functions with one cell.

• Single-celled organisms have large numbers of identical cells that all perform the same function, while multi-celled organisms have cells that are all different and perform different life functions.

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Fungi and bacteria are both single-celled organisms. What do they most likely have in common?

• Both fungi and bacteria are large organisms.

• Both fungi and bacteria can carry out all life functions in their one cell.

• Both fungi and bacteria need sunlight and nutrients from the soil to be able to grow.

• Both fungi and bacteria are highly specialized to do only one job so they must work with other cells to obtain food.

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How is a plant different from bacteria?

• A plant is a multi-celled organism in which each cell performs a specific function. Bacteria is a single-celled organism in which one cell performs all functions.

• Bacteria is a multi-celled organism in which each cell performs a specific function. A plant is a single-celled organism in which one cell performs all functions.

• A plant is a multi-celled organism in which one cell performs all functions. Bacteria is a single-celled organism in which each cell performs a specific function.

• Bacteria is a multi-celled organism in which one cell performs all functions. A plant is a single-celled organism in which each cell performs a specific function.

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How are multicellular and unicellular organisms different?

• Multicellular organisms have more than one cell and are smaller than unicellular organisms.

• Unicellular organisms have more than one cell and are larger than multicellular organisms.

• Unicellular organisms have one cell and are smaller than multicellular organisms.

• Multicellular organisms have one cell and are larger than unicellular organisms.

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Which best explains why humans are multicellular organisms?

• A. Human cells are too small to function alone.

• B. Human cells join together to form one large cell.

• C. Humans need many cells to carry out life processes.

• D. Humans have many systems that perform the same function.

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