Mod C Unit 1 Lesson 2: Photosynthesis & Cellular Respiration

What starting materials do plants use to make food?

• carbonic acid and water

• water and oxygen

• carbon dioxide and water

• carbonic acid and nitrogen

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What is the source of energy for plant and animal cells?

• soil

• oxygen

• consumers

• carbon-based molecules

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What are the products of photosynthesis?

• glucose and oxygen

• carbon dioxide and water

• chlorophyll, protein, and DNA

• plant stems, leaves, and root systems

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Animals breathe in oxygen and breathe out carbon dioxide. Where does the carbon dioxide come from?

• it is produced during photosynthesis

• it is a product of cellular respiration

• it is needed to create energy for cells

• it is created when plants are consumed

What happens to glucose inside a cell during cellular respiration?

• The cell uses carbonic acid to break down glucose.

• The cell uses water to break down glucose.

• The cell uses oxygen to break down glucose.

• The cell uses nitrogen to break down glucose.

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There is a connection between photosynthesis and cellular respiration. The products from one provide the raw materials for the other. What products of photosynthesis are starting materials for cellular respiration?

• energy and carbon

• glucose and oxygen

• carbon dioxide and water

• chlorophyll and chloroplasts

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Why are animals imporatnt to the process of photosynthesis?

• Animals eat plants, which makes space for more plants to grow.

• Animals digest food, which provides the starting materials for photosynthesis.

• Animals release carbon dioxide, which provides the startnig materials for photosynthesis.

• Animals produce energy in the form of heat, which is necessary for photosynthesis to occur.

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Which of the statements below are true? Select (2) two.

• The tree uses photosythesis 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 tre and elephant both use photosynthesis to make food molecules.

Answer explanation

The cells of all living things need energy, the process that uses oxygen to release energy from food molecules is cellular respiration. Sunlight is the source of energy for photosynthesis, which provides both the tree and the elephant with food molecules.

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Whcih of the statements are true about the two chemical reactions? Select (2) two.

• 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 starting materials for Equation B.

Answer explanation

Photosynthesis uses carbon dioxide, water, and light energy from the sun to produce sugars nad oxygen, which are the starting materials for cellular respiration.

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Anamials that eat ONLY meat, such as dolphins, do not get much sugar (carbohydrate) from their diets. Choose the statement below that best explains how a dophin 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 dophin gets the energy it needs directly from the sunlight.

Answer explanation

Meat provides proteins and fat that can be broken down to use as energy for cellular respiration.

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