Lesson 2: Cycles of Matter in Ecosystems

Water evaporates from the leaves of a plant and returns to the atmosphere through a process called _______________.

• respiration

• transpiration

• regeneration

• transportation

All living things use energy and release gas as a waste product. What cycle explains the circulation of these gases?

• water cycle

• oxygen-carbon cycle

• nitrogen cycle

The _____________ cycle is a continuous circulation between the soil, organisms, and air.

• oxygen

• carbon dioxide

• nitrogen

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Which part of the water cycle includes water vapor gas changing to a liquid?

• condensation

• evaporation

• precipitation

• transpiration

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How do animals get nitrogen that is stored in the soil?

• Animals do not take in the nitrogen stored in the soil.

• Bacteria change the nitrogen into gas that the animals breathe.

• The animals can eat the soil and absorb the nitrogen through their digestive system.

• Plants absorb the nitrogen from the soil and animals eat the plants.

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Jason is observing a lake. He wonders how the water in a lake is part of the water cycle. Starting with the water sitting in a lake, how do these things fit into the water cycle? Put the numbers in order starting with the way water from the lake becomes part of the water cycle.

1.Water droplets combine in the clouds to form larger droplets

2.Energy from the sun causes the water in the lake to evaporate.

3.Large water droplets fall to the ground from the clouds

4.Water vapor cools and condenses on dust particles forming clouds.

• 1,2,3,4

• 2,4,1,3

• 3,4,2,1

• 4,2,1,3

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Mrs. Pine's science class learned that green plants use sunlight, water and carbon dioxide to make their own food and release oxygen in the process. How can the class explain how animals complete the oxygen-carbon cycle?

• Animals take in oxygen but they do not release any type of gas as they use energy.

• Animals take in carbon dioxide and use it to make food.

• Animals take in oxygen and release nitrogen as waste.

• Animals take in oxygen and as they use energy, carbon dioxide is released as waste.

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Rainwater that flows over Earth's surface is called _______________. This water gathers in lakes, rivers, streams and ponds.

• runoff

• basin

• tributary

• groundwater

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