Science Quiz: Energy, Homeostasis, and Evolution

Science

A collection of multiple-choice questions covering chemical reactions, biological homeostasis, feedback mechanisms, and evolutionary biology.

Biology Chemistry Evolution

11 Questions Medium Ages 14+ Sep 1, 2026

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About this Study Set

This study set covers Science through 11 practice questions. A collection of multiple-choice questions covering chemical reactions, biological homeostasis, feedback mechanisms, and evolutionary biology. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 11 questions from the Science Quiz: Energy, Homeostasis, and Evolution study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which of the following reactions is exothermic?

A Burning wood in a fireplace
B Dissolving ammonium nitrate in water
C Melting ice cubes
D Photosynthesis in plants

2 Which type of chemical reaction releases energy to the surroundings, usually as heat?

A Decomposition reaction
B Endothermic reaction
C Exothermic reaction
D Neutralization reaction

3 Which statement correctly compares exothermic and endothermic reactions?

A Both exothermic and endothermic reactions always make the surroundings warmer.
B Exothermic and endothermic reactions do not involve energy changes.
C Exothermic reactions absorb heat, while endothermic reactions release heat.
D Exothermic reactions release heat to the surroundings, while endothermic reactions absorb heat from the surroundings.

4 A person has a body temperature of 40°C. Which term refers to the body's ability to maintain a stable internal condition?

A Circulation
B Digestion
C Homeostasis
D Respiration

5 During a basketball game, Leo's heart beats faster. After he stops and rests, his heart rate returns toward normal. What is happening?

A His body is trying to maintain stable internal conditions despite changes caused by exercise.
B His body is preventing blood from reaching his muscles.
C His blood pressure must remain high for several hours after exercise.
D His body stops using feedback mechanisms during exercise.

6 When a person gets a cut, activated platelets release chemicals that attract more platelets until a clot forms. Why is this positive feedback?

A The response reduces platelets.
B The response increases platelet activation.
C The response restores body temperature.
D The response stops platelet activity.

7 Which feedback mechanism reverses a change and brings the body back toward its normal condition?

A Forward feedback
B Negative feedback
C Neutral feedback
D Positive feedback

8 A population of birds becomes separated when a river forms. Over generations, the two groups develop different characteristics. Which concept explains this?

A Heredity
B Isolation
C Selection
D Variation

9 Which line of evidence provides preserved remains or traces of organisms from the past?

A Biography
B Comparative morphology
C Embryology
D Fossils

10 Why is variation important in the process of evolution?

A It makes all organisms identical.
B It causes all organisms to develop the same traits.
C It prevents organisms from adapting to their environment.
D It provides differences that may help organisms survive and reproduce.

11 What is the term for the differences in traits among individuals of the same species?

A Adaptation
B Heredity
C Isolation
D Variation

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