5th Life Science Schoolnet

Charles is reading a book about bacteria. Which statement will Charles most likely read in his book?

• Bacteria have one cell that performs many tasks.

• Bacteria have one cell that performs a single task.

• Bacteria have many cells and each performs many tasks.

• Bacteria have many cells and each performs a single task.

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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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Why does a human require specialized cells to live?

• Specialized cells allow humans to adapt to changes in their environment.

• Human bodies have systems that require cells with different functions.

• Specialized cells allow for all life processes to occur in one cell.

• Human bodies are simple and require few cells.

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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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Which organism is single-celled?

• bacteria

• tree

• dog

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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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Max is comparing the characteristics of different types of organisms. Which best describes a difference between insects and bacteria?

• Insects are made of one cell, while bacteria are made of many cells.

• Bacteria are made of one cell, while insects are made of many cells.

• Insects require energy to perform life functions while bacteria do not.

• Bacteria require energy to perform life functions while insects do not.

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What roles do the muscular and respiratory systems serve in the body when someone lifts weights?

• The muscular system allows the person to lift the weights, while the respiratory system provides oxygen to the body.

• The muscular system provides oxygen to the body, while the respiratory system allows the person to lift the weights.

Which best describes the system of the human body that breaks down food for cell energy?

• cardiovascular system

• respiratory system

• circulatory system

• digestive system

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Which two human body systems are MOST responsible for getting oxygen to cells?

• digestive and skeletal

• skeletal and circulatory

• circulatory and respiratory

• respiratory and digestive