Unit 1 LC2 Summative Review

What is homeostasis?

• The process by which organisms maintain a stable internal environment.

• The process of cell division.

• The breakdown of glucose for energy.

• The synthesis of proteins.

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DOK Level 1: Recall

Which of the following is an example of negative feedback in the human body?

• Blood clotting

• Childbirth contractions

• Regulation of blood glucose levels

• Fever

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DOK Level 2: Skill/Concept

Explain how positive feedback differs from negative feedback in biological systems.

• Positive feedback amplifies changes, while negative feedback reduces changes.

• Positive feedback reduces changes, while negative feedback amplifies changes.

• Both positive and negative feedback amplify changes.

• Both positive and negative feedback reduce changes.

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DOK Level 2: Skill/Concept

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

• It is the variable that is changed to test its effects.

• It is the variable that is measured in the experiment.

• It is the variable that is kept constant to ensure a fair test.

• It is the variable that is used to calculate results.

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DOK Level 1: Recall

In a scientific experiment, why is it important to have a control group?

• To ensure that the experiment is conducted in a controlled environment.

• To provide a standard for comparison against the experimental group.

• To increase the number of variables being tested.

• To ensure that the hypothesis is correct.

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DOK Level 2: Skill/Concept

Describe a scenario where positive feedback is beneficial in a biological system.

• The regulation of blood pressure.

• The process of blood clotting.

• The maintenance of body temperature.

• The regulation of blood sugar levels.

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DOK Level 3: Strategic Thinking

Which of the following best describes an independent variable?

• It is the variable that is measured in an experiment.

• It is the variable that is kept constant throughout the experiment.

• It is the variable that is changed or controlled to test its effects on the dependent variable.

• It is the variable that is used to calculate the results.

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DOK Level 1: Recall

How does negative feedback contribute to homeostasis?

• By amplifying changes in the internal environment.

• By reducing changes and bringing the system back to its set point.

• By maintaining constant levels of all variables.

• By preventing any changes in the internal environment.

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DOK Level 2: Skill/Concept

Evaluate the impact of removing a control variable in an experiment designed to test the effect of light on plant growth.

• It would have no impact on the results.

• It would make it difficult to determine if light is the only factor affecting plant growth.

• It would ensure that light is the only factor being tested.

• It would increase the accuracy of the experiment.

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DOK Level 3: Strategic Thinking

Which of the following is an example of homeostasis?

• taking out the trash
• drinking water
• sweating on a hot day
• taking a shower

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NGSS.HS-LS1-3