Exploring Bioaccumulation and Biomagnification in Marine Ecosystems

The video explores the vastness of the ocean and how it leads to underestimating the impact of pollutants. It explains the process of bioaccumulation, where toxins build up in marine food chains, affecting apex predators. The video highlights the role of heavy metals, particularly mercury, in marine pollution. Research shows that marine mammals like elephant seals can concentrate mercury in their habitats, impacting marine ecosystems and human health.

What percentage of the Earth's surface is covered by oceans?

• About 70%

• About 50%

• About 80%

• About 60%

What happens to coastal ecosystems after it rains?

• They dry out completely

• They absorb no pollutants

• They become completely clean

• They retain some pollutants

What is the process called where toxins increase in concentration up the food chain?

• Biodegradation

• Bioreduction

• Biomagnification

• Bioaccumulation

Which type of compounds are stored in an organism's fat deposits?

• Polar compounds

• Nonpolar compounds

• Inorganic compounds

• Water-soluble compounds

What characteristic does a compound need to be considered bioaccumulative?

• Short-lived and highly reactive

• Quickly degradable and water-soluble

• Long-lasting and lipid-soluble

• Instantly reactive and non-soluble

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NGSS.HS-PS1-5

Which heavy metal is most studied for its health issues in marine environments?

• Mercury

• Lead

• Cadmium

• Zinc

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NGSS.HS-LS4-5

How is inorganic mercury transformed into a more dangerous form in the ocean?

• By water pressure

• By aerobic bacteria

• By anaerobic bacteria

• By sunlight exposure

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NGSS.HS-LS2-3

What role do elephant seals play in the concentration of methyl mercury?

• They concentrate it through molting

• They have no significant effect

• They disperse it evenly in the ocean

• They break it down into less harmful substances

What was the comparison result of methyl mercury concentrations between Año Nuevo and San Francisco Bay?

• Año Nuevo had slightly higher concentrations

• San Francisco Bay had slightly higher concentrations

• No mercury was detected in either location

• Both had equal concentrations

What implication does the accumulation of methyl mercury in marine ecosystems have?

• It affects major fisheries and recreational activities

• It improves the marine biodiversity

• It has no significant impact

• It decreases the water salinity

Tags

NGSS.HS-ESS3-1

NGSS.HS-LS2-7

NGSS.HS-LS4-5