Levels of Organization

Plants contain xylem and phloem tissue. What organ system in animals performs a similar function as the xylem and phloem of plants?

• digestive system

• excretory system

• respiratory system

• circulatory system

A plant leaf is an organ that traps light energy to make food. In what way is an animal stomach similar to a plant leaf?

• both organs make food

• both organs are made up of only one kind of cell

• both organs are made up of several kinds of tissues

• both organs take in oxygen and release carbon dioxide

Cells of a multicellular organism are specialized. What does this mean?

• Cells of a multicellular organism are adapted for performing a specific function.

• Cells of a multicellular organism can survive independently of the other cells.

• Cells of a multicellular organism are specialized because they have a complex structure.

• Each cell of a multicellular organism can perform all the life functions the organism needs to survive.

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Jana is studying the structure and function of different parts of a flowering plant. She drew and labeled the plant shown in the illustration. Which statement is a function of the roots?

• They are about 15 cm long.

• They are connected to the stem.

• They have tiny root hairs on them.

• They take in nutrients from the soil.

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This picture shows a microscopic view of blood. Blood is made of different types of cells that work together. Which of the following levels of organization best classifies blood?

• cell

• tissue

• organ

• organ system

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Which is a type of tissue that both plants and animals have?

• nerve

• ground

• protective

• connective

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This diagram shows the two main parts of the human body's central nervous system. According to the diagram, which term best describes the brain?

• cell

• organ

• organ system

• tissue

Which statement best explains the relationship between structure and function in an organism?

• Structure and function refers to the different tissue types within an organism.

• Structure and function refers to the jobs of tissues, organs, and organ systems.

• Structure and function refers the relationships between the locations of tissues, organs, and organ systems.

• Structure and function refers to the relationship between the parts of cells, tissues, organs, and organ systems and the job they do in the body.

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Which term describes the adaptation of cells, organs, or organ systems for a specific function?

• structure

• specialization

• multicellular organism

• level of cellular organization

The illustration below shows an example of the levels of structural organization in living things. Which of the following choices best completes the diagram?

• blood

• intestines

• a human body

• the circulatory system

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