Environmental Science Concepts Assessment

Mr. Salmingo reviews energy transfer in ecosystems, explaining how energy flows one way and chemicals cycle. He discusses the pyramid of biomass, biogeochemical cycles, and the inefficiency of energy transfer. The video covers human impacts on the environment, including biomagnification, global warming, and ozone depletion. It concludes with the effects of human activities on biodiversity and ecosystem diversity.

What percentage of energy is typically transferred from one trophic level to the next in an ecosystem?

• 50%

• 20%

• 10%

• 5%

Which of the following is NOT a biogeochemical cycle discussed in the video?

• Water cycle

• Carbon cycle

• Nitrogen cycle

• Sulfur cycle

What is the primary cause of acid rain?

• Use of pesticides

• Overfishing

• Burning of fossil fuels

• Deforestation

What is biomagnification?

• The increase in biomass at each trophic level

• The concentration of toxins as they move up the food chain

• The process of photosynthesis

• The cycle of nitrogen in the atmosphere

How does global warming primarily affect polar regions?

• Increases biodiversity

• Causes ice caps to melt

• Decreases ocean salinity

• Increases volcanic activity

What is the role of the ozone layer in the atmosphere?

• To reduce carbon dioxide levels

• To block harmful UV rays

• To trap heat and warm the Earth

• To increase oxygen levels

Which human activity is NOT a threat to biodiversity?

• Habitat destruction

• Overexploitation

• Introduction of invasive species

• Sustainable farming

What happens when a keystone species is removed from an ecosystem?

• The ecosystem becomes more stable

• Biodiversity increases

• New species are introduced

• The entire food chain can collapse

What is an example of overexploitation?

• Introducing a new predator

• Hunting a species to near extinction

• Reducing carbon emissions

• Planting more trees

Why is it important to maintain biodiversity?

• It decreases the number of species

• It ensures ecosystem stability

• It increases the Earth's temperature

• It reduces the need for conservation