Laws of Conservation

Which of the following best describes how carbon dioxide in the atmosphere is changed by living organisms?

• it is absorbed by plants during photosynthesis

• it is exchanged for water vapor through the process of respiration

• it is created when factory workers burn fossil fuels

• it is used by plants and animals to convert organic carbon to oxygen

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NGSS.MS-LS1-6

How does this illustration demonstrate the Law of Conservation of Mass?

• Carbon is being created.

• Carbon is being destroyed.

• Carbon is not being created or destroyed but merely transferred from place to place.

• Carbon is being created, destroyed, and transferred from place to place.

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Which of the following is NOT a way carbon dioxide returns to the atmosphere?

• decay of organisms

• photosynthesis

• emissions by factories

• respiration

Living things obey the law of conservation of energy. Which of the following statements does NOT summarize a key idea of this law?

• During an ordinary chemical reaction, no energy is created.

• Energy can be changed in form during a chemical reaction.

• During an ordinary chemical reaction, no energy is destroyed.

• Energy can be destroyed during an ordinary chemical reaction.

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How is carbon returned to the soil?

• respiration

• combustion

• photosynthesis

• decomposition

Living systems obey the law of conservation of mass. Which of the following statements supports the main ideas of the law of conservation of mass?

• The substances that take part in a chemical reaction are the same as the substances that are formed by the reaction.

• The masses of the substances that take part in a chemical reaction are less than the masses of the substances that are formed.

• The masses of the substances that take part in a chemical reaction are equal to the masses of the substances that are formed.

• The masses of the substances that take part in a chemical reaction are greater than the masses of the substances formed by the reaction.

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NGSS.MS-PS1-5

All organisms require energy to carry out life processes. Organisms get this energy by breaking down food. What is the initial source of all energy contained in food?

• Sun

• Soil

• Plants

• Carbon

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NGSS.MS-LS1-6

What does the law of conservation of energy state?

• Energy can be created or destroyed.

• Energy cannot be transferred only created or destroyed.

• Energy cannot be created, destroyed, or transformed.

• Energy cannot be created or destroyed only transformed.

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How does a fox eating a rabbit demonstrate the Law of Conservation of Energy?

• Energy is created and transformed.

• Energy is destroyed.

• Energy is both created and destroyed.

• Energy is neither created nor destroyed only transformed.

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NGSS.HS-LS1-7

Which of these statements is true about the relationship between organisms and carbon in the environment?

• Organisms neither receive carbon from the environment nor add carbon to the environment.

• Organisms both receive carbon from the environment and return carbon to the environment.

• Organisms add carbon to the environment but do not receive carbon from the environment.

• Organisms receive carbon from the environment but do not return carbon to the environment.

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