Science: Cycles of Matter in Ecosystems

Water evaporates from the leaves of a plant and returns to the atmosphere in a process called (a)   .

• respiration

• transpiration

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.

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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 a gas that the animals breathe.

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

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

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James is observing a lake. He wonders how the water in the lake is included in the water cycle. Place the stages of the water cycle in order, starting with the water in the lake.

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

• Energy from the sun causes the water in the lake to rise.

• Water droplets combine in the clouds to form large water droplets.

• Water vapor cools and condenses on dust particles.

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Explain how animals complete the oxygen-carbon cycle.

• Animals take in the oxygen, but do not release 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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Fill in the blanks using the available answer choices. Rain water that flows over Earth's surface is called (a)   . This water gathers in lakes and rivers. (Blank 1)

• runoff

• groundwater

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Match the following

• runoff

• occurs when the sun heats water up and it becomes vapor in the air.

• Evaporation

• condensation falling onto land in the form of rain, sleet, hail, snow, and mist. Only 10% of water evaporated falls as precipitation.

• Condensation

• is the water that runs off land back into an ocean or river.

• Precipitation

• the opposite of evaporation; it occurs when air cools and the vapor collects into liquid form.

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Label the 3 main parts of the water cycle.

Spelling is important!

a

b

c

Precipitation

Evaporation

Condensation

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