Biodiversity and Ecosystems

The variety of different organisms found in an ecosystem is called:

• a population

• biodiversity

• an ecosystem service

• symbiosis

The positive benefits that wildlife or ecosystems provides to people are called:

• ecosystem services

• symbiosis

• biodiversity

• ecosystem collapse

A species that is not native to an area is called:

• population

• organism

• introduced species

• newly discovered species

Why are invasive species a problem?

• Invasive species are originally from an area and take over it.

• Invasive species are prey to many animals so they must keep large populations.

• Invasive species have no predators in their new ecosystems so they grow quickly and become very large.

• Invasive species keep the ecosystems in equilibrium by having large numbers.

The primary cause of invasive species introduction is:

• natural migration to new areas

• human actions

• weather events like hurricanes blowing species around

• asteroids bring new species from space

A large concern relating to deforestation (habitat destruction) in the Amazon Rainforest is:

• loss of timber from removed trees

• loss of medicines from plants only found there

• erosion of soil from the lack of tree roots

• higher likelihood of forest fires from the clearcutting process

An ecosystem with a large number of individuals can have a low biodiversity.

• True, if there are large numbers of only a few species

• False, larger numbers mean more biodiversity

Increasing concentration of toxins in an organism as a result of ingesting other plants or animals is called:

• biological magnification

• pollution

• abiotic factors

• biotic factors

A rainforest has an abundance of different plant and animal species. This is an example of what?

• high biodiversity

• low biodiversity

• conservation of biodiversity

Land developers replant trees that have been harvested for timber. This is an example of what?

• increasing biodiversity

• ecosystem conservation

• genetic diversity

• species diversity