Exploring Biogeochemical Cycles

The video discusses biogeochemical cycles, focusing on the movement of matter and energy in ecosystems. It covers the water, carbon, nitrogen, sulfur, and phosphorus cycles, highlighting the roles of biotic and abiotic sources. Human impacts on these cycles, such as through the use of fertilizers and fossil fuels, are also examined. The video emphasizes the importance of understanding these cycles for maintaining ecosystem balance.

What does the term 'geo' refer to in biogeochemical cycles?

• Chemical reactions

• Energy flow

• Geological positions

• Life

Tags

NGSS.HS-ESS2-6

NGSS.HS-LS2-5

How does matter behave differently from energy in ecosystems?

• Both matter and energy are recycled

• Energy is recycled, while matter is lost as heat

• Matter is recycled, while energy is lost as heat

• Matter is lost as heat, while energy is recycled

Tags

NGSS.HS-LS2-3

Which process in the water cycle involves the movement of water from plant roots to leaves?

• Evaporation

• Precipitation

• Transpiration

• Percolation

How do humans impact the water cycle?

• By increasing transpiration

• By damming rivers and lakes

• By reducing precipitation

• By increasing percolation

Tags

NGSS.HS-ESS2-5

What is the main abiotic source of carbon in ecosystems?

• Carbon in soil

• Carbon in animals

• Carbon dioxide in the atmosphere

• Carbon in plants

Tags

NGSS.HS-LS2-5

How do plants contribute to the carbon cycle?

• By releasing carbon dioxide during photosynthesis

• By decomposing and releasing carbon into the soil

• By converting carbon dioxide into biological molecules

• By emitting carbon dioxide during respiration

Tags

NGSS.HS-LS2-5

What role do nitrogen-fixing bacteria play in the nitrogen cycle?

• They absorb nitrogen from the soil

• They decompose organic matter

• They release nitrogen gas into the atmosphere

• They convert nitrogen into nitrates and ammonium

How can the use of fertilizers impact the nitrogen cycle?

• By reducing the amount of nitrogen in the soil

• By increasing the amount of nitrogen in the atmosphere

• By disrupting the balance of nitrogen in ecosystems

• By decreasing the need for nitrogen-fixing bacteria

Tags

NGSS.HS-LS2-3

NGSS.HS-LS2-6

What is a major abiotic source of sulfur in ecosystems?

• Combustion of fossil fuels

• Sulfur in plants

• Sulfur in animals

• Sulfur in soil

Why is phosphorus important for living organisms?

• It is used in respiration

• It is a major source of energy

• It is part of the DNA backbone

• It is a component of amino acids