Cycles in Ecosystems: Energy and Nutrients

The video tutorial explains the cycles of energy and matter in ecosystems, focusing on the water, oxygen, carbon, nitrogen, and phosphorus cycles. It highlights how energy flows and matter cycles through biotic and abiotic components, emphasizing the importance of these cycles for life processes. Key processes like photosynthesis, respiration, and nitrogen fixation are discussed, along with human impacts such as fossil fuel combustion and fertilizer use.

What percentage of energy is transferred from one organism to another in an ecosystem?

• 10%

• 50%

• 100%

• 1%

Which process in the water cycle involves water vapor being released from plant leaves?

• Precipitation

• Evaporation

• Condensation

• Transpiration

What are the two main processes involved in the oxygen cycle?

• Condensation and Evaporation

• Transpiration and Respiration

• Respiration and Photosynthesis

• Photosynthesis and Combustion

In the carbon cycle, what is the form of carbon used in photosynthesis?

• Carbon Monoxide

• Carbon Dioxide

• Methane

• Glucose

How does carbon return to the atmosphere in the carbon cycle?

• Through nitrogen fixation

• Through transpiration

• Through respiration

• Through photosynthesis

Which process is responsible for converting gaseous nitrogen into a form usable by plants?

• Transpiration

• Nitrogen Fixation

• Photosynthesis

• Respiration

What is the primary role of decomposers in the nitrogen cycle?

• Release oxygen

• Fix nitrogen gas

• Absorb carbon dioxide

• Convert nitrogen into usable forms

Which molecule is created by phosphorus and is crucial for energy storage in living organisms?

• Glucose

• ATP

• RNA

• DNA

What is the main source of phosphorus in the environment?

• Atmosphere

• Weathering of rocks

• Ocean water

• Combustion

Which cycle does not involve a gaseous phase?

• Phosphorus Cycle

• Nitrogen Cycle

• Carbon Cycle

• Water Cycle