Cycles of Matter in Ecosystems: Water, Nitrogen, and Oxygen-Carbon Dynamics

The video tutorial covers three main cycles of matter in ecosystems: the water cycle, the oxygen-carbon cycle, and the nitrogen cycle. It explains the processes involved in each cycle, such as evaporation, condensation, and precipitation in the water cycle; photosynthesis and respiration in the oxygen-carbon cycle; and the role of bacteria and decomposers in the nitrogen cycle. The tutorial emphasizes the repetitive nature of these cycles and their importance in maintaining ecological balance.

What is the first process in the water cycle where water changes from liquid to gas?

• Runoff

• Condensation

• Precipitation

• Evaporation

Which of the following is NOT a type of precipitation?

• Hail

• Sleet

• Rain

• Fog

What is the term for water that flows over the ground and collects in bodies of water?

• Transpiration

• Evaporation

• Condensation

• Runoff

What do plants release during the day as part of the oxygen-carbon cycle?

• Nitrogen

• Carbon Dioxide

• Hydrogen

• Oxygen

Why are humans and animals called consumers in the oxygen-carbon cycle?

• They do not need sunlight

• They release oxygen

• They consume other organisms for energy

• They produce their own food

What increases the amount of carbon dioxide in the air besides respiration?

• Photosynthesis

• Burning fossil fuels

• Condensation

• Evaporation

What percentage of the air is made up of nitrogen?

• 50%

• 78%

• 21%

• 10%

How does nitrogen from the air reach the soil?

• Via rain or lightning

• By evaporation

• Through animal respiration

• Through photosynthesis

What role do bacteria play in the nitrogen cycle?

• They produce nitrogen gas

• They release oxygen

• They convert nitrogen into a usable form for plants

• They decompose dead plants

What happens to nitrogen when animals produce waste?

• It evaporates

• It is absorbed by plants

• It turns into oxygen

• It is returned to the air by decomposers