7th Grade Life Science End Of The Year Final Review

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What is a scientific experiment?

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A scientific experiment is a method of investigation where a hypothesis is tested by manipulating variables and observing the effects.

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What happens to a population when it is separated into two groups?

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When a population is separated, it can lead to different adaptations in each group over generations, potentially resulting in speciation.

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Why do plant cells have cell walls?

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Plant cell walls provide rigidity and support, allowing plants to grow upright, while animal cells are more flexible.

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What is the cell theory?

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The cell theory states that all living organisms are composed of cells, cells are the basic unit of life, and all cells come from pre-existing cells.

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What is the significance of gene estimates in humans?

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The varying estimates of human genes highlight the complexity of genetics and the ongoing research in the scientific community.

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What is the role of a control group in an experiment?

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A control group is used as a standard for comparison in an experiment, helping to isolate the effects of the independent variable.

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What is adaptation in biology?

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Adaptation is a process where organisms become better suited to their environment through changes in traits over generations.

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What is the difference between a hypothesis and a theory?

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A hypothesis is a testable prediction, while a theory is a well-substantiated explanation based on a body of evidence.

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What is the function of the nucleus in a cell?

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The nucleus contains the cell's genetic material and controls its growth, metabolism, and reproduction.

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What is biodiversity?

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Biodiversity refers to the variety of life in a particular habitat or ecosystem, including the number of species and genetic diversity.