SC.8.L.18.4 Conservation of Mass and Energy in Living Systems

What is energy?

• anything that takes up space

• anything that has mass

• the ability to conduct current

• the ability to do work

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Photosynthesis is the process that captures the ___________ of sunlight and transforms it into the _______________ of sugar.

• chemical energy - solar energy

• kinetic energy to potential energy

• solar energy - chemical energy

• potential energy to kinetic energy

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How does blowing up a balloon help prove that air is matter?

• It shows that air has kinetic energy.

• It shows that air takes up space.

• It shows that air contains oxygen.

• It shows that air is a solid.

Living systems 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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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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Plant cells contain a green pigment called chlorophyll. Chlorophyll has a role in the process of photosynthesis. What

does chlorophyll do?

• produces the sugar glucose from oxygen

• produces oxygen from the sugar glucose

• absorbs light energy from the sun

• absorbs the sugar glucose form the plant

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Green plants produce their own food during photosynthesis. This image shows the process of photosynthesis. What are the products of photosynthesis?

• carbon dioxide and water

• the sugar glucose and oxygen

• chlorophyll and mitochondria

• chlorophyll and chloroplast

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Green plants and algae make their own food through photosynthesis. What is photosynthesis?

• using energy from sunlight to convert water and oxygen into food

• using energy from sunlight to convert water and glucose into food

• using energy from sunlight to convert water and chlorophyll into food

• using energy from sunlight to convert water and carbon dioxide into food

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What is the role of the green pigment chlorophyll in photosynthesis?

• absorbs light energy from the sun

• absorbs glucose from the storage in the plant

• produces glucose from oxygen

• produces oxygen from glucose

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How do organisms get the energy they need?

• Plants get energy from fertilizers, and animals get energy by drinking water.

• Plants get energy from glucose produced in the soil, and animals get energy directly from sunlight.

• Plants do not require energy because they do not move, and animals get energy by performing exercise.

• Plants produce their own energy through photosynthesis, and animals get energy from eating other organisms.

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