Cycles of Matter and Energy in Ecosystems

The video explains biogeochemical cycles, focusing on the flow of energy and cycling of matter through ecosystems. It covers biological, geological, physical, and human processes that drive these cycles. The water, carbon, nitrogen, and phosphorus cycles are detailed, highlighting their importance and processes involved. The concept of limiting nutrients is also discussed.

What is the primary difference between energy flow and matter cycling in ecosystems?

• Matter flows in one direction, energy is recycled.

• Energy is recycled, matter is not.

• Both energy and matter are recycled.

• Energy flows in one direction, matter is recycled.

Which of the following is a biological process that cycles matter?

• Mining

• Cloud formation

• Photosynthesis

• Volcanic eruptions

Which process is NOT involved in the water cycle?

• Evaporation

• Transpiration

• Precipitation

• Photosynthesis

What role do plants play in the carbon cycle?

• They release carbon dioxide through photosynthesis.

• They store carbon in the form of fossil fuels.

• They absorb carbon dioxide for photosynthesis.

• They convert carbon dioxide into nitrogen.

Which human activity contributes to the carbon cycle?

• Photosynthesis

• Volcanic eruptions

• Burning fossil fuels

• Nitrogen fixation

What is the main form of nitrogen in the atmosphere?

• Ammonia

• Nitrate

• Nitrogen gas

• Nitrite

How is nitrogen gas converted into a usable form for plants?

• Through photosynthesis

• By volcanic activity

• Via nitrogen fixation by bacteria

• Through evaporation

What is a limiting nutrient?

• A nutrient that is not needed by living organisms

• A nutrient that limits the productivity of an ecosystem

• A nutrient that is only found in the atmosphere

• A nutrient that is abundant in the ecosystem

Which process returns nitrogen to the atmosphere?

• Transpiration

• Denitrification

• Nitrogen fixation

• Photosynthesis

Why is phosphorus important for living organisms?

• It is a primary source of energy.

• It is a key element in DNA.

• It is a major component of proteins.

• It is used in photosynthesis.