Chapter 2 Review: Matter and Energy in Ecosystems

Decomposers are important to ecosystems because they...

• break down dead matter

• capture energy from the Sun

• are producers

• can be omnivores

What are the products of photosynthesis?

• Carbon dioxide and water

• Carbon dioxide and oxygen

• Glucose and oxygen

• Glucose and water

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A jungle ecosystem has plants, animals, and decomposers (which consume dead things). Scientists are interested in studying cellular respiration in the jungle. Which group or groups of organisms should they study?

• plants

• animals and decomposers

• all organisms in the jungle

• animals

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Plants, animals, and decomposers (which consume dead things) are in a forest ecosystem. Scientists are studying photosynthesis in the forest. Which group or groups of organisms should they study?

• all organisms in the forest

• animals and decomposers

• plants and decomposers

• plants

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Where in the cell does photosynthesis occur?

• mitochondria

• stomata

• xylem

• chloroplast

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Parrotfish live in the ocean and eat plantlike organisms called algae. Sunlight is shining on the fish and the algae. Is carbon moving into the living things, moving out of the living things, or both?

• Carbon is moving into and out of the living things, at the same time.

• Carbon is only moving into the living things; it is not moving out of them.

• Carbon is only moving out of the living things; it is not moving into them.

• There is no way to know for sure, with this information.

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Pea plants have been in the sunlight since early morning. What can the pea plants do because they are in sunlight? What does this mean for the number of energy storage molecules in the pea plants? The pea plants can…

• give off carbon to the air. Giving off carbon allows them to make energy storage molecules.

• give off carbon to the air. Giving off carbon uses up energy storage molecules.

• take in carbon from the air. The carbon is used to break down energy storage molecules.

• take in carbon from the air. The carbon is used to make energy storage molecules.

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What are the products of cellular respiration?

• Energy, Water, and Carbon Dioxide

• Water and Oxygen

• Oxygen and Carbon Dioxide

• Water and Energy

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Some rice plants on a hillside are taking in carbon from the air around them. Are the plants in sunlight? What is happening to the number of energy storage molecules in the plants? The plants...

• are not in sunlight, and the number of energy storage molecules in the plants is increasing.

• are in sunlight, and the number of energy storage molecules in the plants is decreasing.

• are not in sunlight, and the number of energy storage molecules in the plants is decreasing.

• are in sunlight, and the number of energy storage molecules in the plants is increasing.

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If the number of decomposers decrease in an ecosystem, we can expect the rate of cellular respiration to...

• increase

• decrease

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