Biodiversity Threats Quiz

What is the estimated percentage of species that have gone extinct since life began on Earth?

• 50%

• 75%

• 99%

• 25%

How does habitat fragmentation affect species living in those areas?

• It has no effect on them.

• It makes them more vulnerable to environmental changes.

• It increases their population size.

• It improves their genetic diversity.

Which of the following animals were hunted to extinction in the 1800s?

• Woolly Mammoth and Saber-toothed Cat

• Dodo and Tasmanian Tiger

• Passenger Pigeon and Carolina Parakeet

• Bengal Tiger and Blue Whale

What is a common consequence of introducing invasive species to a new environment?

• They have no impact on the ecosystem.

• They outcompete native species for resources.

• They often become endangered themselves.

• They help native species thrive.

What was the impact of the pesticide DDT on bird populations?

• It made them more resistant to diseases.

• It caused their eggshells to thin, leading to embryo death.

• It had no effect on them.

• It increased their population.

Which chemical was banned in the United States in 1972 due to its harmful effects on wildlife?

• DDT

• Mercury

• PCB

• Lead

How does climate change pose a threat to biodiversity?

• It has no impact on biodiversity.

• It causes temperatures to change faster than species can adapt.

• It creates more habitats for species.

• It stabilizes global temperatures.

What is a significant cause of global warming linked to human activities?

• Urbanization

• Deforestation

• Burning fossil fuels

• Overfishing

What percentage of Earth's species could face extinction if fossil fuel burning continues?

• 5%

• 25%

• 10%

• 50% or more

What is the overall impact of the five major human activities discussed in the video?

• They only affect a small number of species.

• They have left a permanent ripple effect on all life on Earth.

• They create more opportunities for species to thrive.

• They have no lasting impact on biodiversity.