Biodiversity and its Threats

Biodiversity refers to

• extinct species
• the variety of species on Earth
• nonrenewable resources
• the rate of species decline

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1. What makes a species invasive?

• Moving to a new ecosystem and taking resources from natives 
• Not having papers
• Species that can't adapt
• Plants that take up too much space

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If a blue catfish is introduced and eats the large fish who eat the smaller fish, what will happen to the population of the smaller fish?

• Increase
• Decrease
• Stay the same
• No affect on smaller fish

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Why do the populations of invasive species grow so quickly? 

• Invasive Species are native to an area. 
• Invasive species are prey to many animals.
• Invasive species have no predators.
• Invasive species keep the ecosystems in equilibrium.

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What are the greatest problems facing plants, animals, and people?

• introducing new species that  can cause problems 
• habitat destruction
• illegal hunting 
• all of the above

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The number of different species in an area is referred to as its _______________.

• population
• genetic diversity
• biodiversity
• Niche diversity

What is the variety of genes present?

• bidiversity
• species diversity
• extinction
• genetic diversity

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The number of different species and the abundance of each species in a biological community.

• genetic diversity
• ecosystem diversity
• extinction
• species diversity

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the breaking of habitats into smaller pieces is called...

• habitat division

• habitat pollution

• habitat corruption

• habitat fragmentation

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Climate change is predicted to have an impact on Earth's biodiversity. What could be a consequence of climate change on marine biodiversity?

• An increase in the temperature of the ocean may cause bleaching of corals, thus dramatically reducing biodiversity

• An increase in the temperature of the ocean will cause coastal wetlands to shrink, thus decreasing biodiversity

• An influx of fresh water as the ice caps melt will increase salinity of the ocean, thus eliminating species sensitive to changes in salinity

• An increase in atmospheric temperature will cause a significant increase in evaporation from the ocean, thus lowering sea levels around the globe and limiting viable habitats for marine organisms.

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