Unit 1: Matter and Energy in Living Systems

What happens to the food after a snail eats it? Select all that apply

• The snail breaks apart the food molecules to get energy.
• The snail uses the matter in the food to grow.
• The snail uses the matter in the food to produce its own food.
• The snail uses the energy from the sun to make food.

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Plants get energy from the ______ .

• sun
• air

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When the snail eats a plant, it uses the energy stored in ________ of other molecules to get energy.

• bonds
• atoms

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Which of the statements below are true? Select all that apply.

• The tree uses photosynthesis to get energy from food molecules; the elephant uses cellular respiration to get energy from food molecules.

• The tree and the elephant both use cellular respiration to get energy from food molecules.

• Sunlight is the ultimate source of energy for both the tree and the elephant.

• The tree and the elephant both use photosynthesis to make food molecules.

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Which of the statements are true about the two chemical reactions? Select all that apply.

• Equation A summarizes photosynthesis, and Equation B summarizes cellular respiration.

• Equation A summarizes cellular respiration, and Equation B summarizes photosynthesis.

• Both chemical reactions produce oxygen and energy.

• The products of Equation A are the reactants for Equation B.

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Animals that eat only meat, such as dolphins, do not get much sugar (carbohydrate) from their diets. Select the statement below that best explains how a dolphin gets the energy it needs from its food.

• The dolphin does not use cellular respiration to get energy from food.

• The dolphin is not very active so it does not need a lot of energy to function.

• The dolphin’s body is able to break down other carbon-based molecules, such as proteins and fats, to use as an energy source for cellular respiration.

• The dolphin gets the energy it needs directly from sunlight.

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Which of the following are true statements about a chemical equation? Select all that apply.

• A chemical equation models a chemical reaction.

• Numbers are used in a chemical equation to show which side of the equation has more molecules.

• A chemical equation uses symbols to show the relationship between parts of a chemical reaction.

• The arrow in a chemical equation shows that one side of the equation has more atoms than the other.

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Which of the following are involved in the release of energy during cellular respiration? Select all that apply.

• sugar molecules are broken down in the cytoplasm

• sugar molecules and carbon dioxide are produced in chloroplasts

• molecular bonds are broken in the mitochondria by oxygen

• oxygen is released along with sugar molecules

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A process in which atoms are rearranged to produce new substances.

• chemical reaction

• reactants

• products

• chemical equation

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The starting substances in a chemical reaction

• chemical reaction

• reactants

• products

• chemical equation

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