Unit 3 Science Test Review

Which of these ecosystems would be most likely to recover?

• a temperate forest with average biodiversity that loses many types of trees due to a fire

• a tropical rainforest with high biodiversity that loses a species of fig tree due to a type of fungus

• a desert that has low biodiversity and loses all of the saguaro cacti that are growing there

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What is a nonnative species?

• species of plant or animal from that ecosystem

• species of plant or animal brought from another ecosystem

• species of pant or animal that helps ecosystems thrive

How does deforestation affect an ecosystem?

• it increases the number of species

• it decreases the number of species

• it creates a new habitat for species to live

Which tank will have the highest overall biodiversity?

• one coral, one type of algae, and

  a ghost shrimp

• five angelfish, two types of coral, one type of algae, and two seahorses

• three angelfish and two seahorses

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Which ecosystem would scientists consider to be the most stable?

• a tropical rainforest that is being cut down to make room for farmland

• a temperate forest where all the tree trunks have been damaged by beetles

• a savanna that retains the same number of species even when a drought occurs

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What could happen if all of the sharks were gone from a marine ecosystem?

• the other fish species would also decline

• populations of other predators would increase rapidly

• populations of fish that were food for sharks would increase

What is an ecosystem service?

• function of an ecosystem that benefits humans

• how energy moves through en ecosystem

• function of matter and energy moving through an ecosystem

An ecosystem with high biodiversity will...

• take awhile to recover

• will not recover

• will likely recover quickly

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Polar ecosystems have less biodiversity than rain forest ecosystems do. Select the statements that are true.

• Polar ecosystems are less healthy than rain forest ecosystems

• Polar ecosystems are home to fewer species then rain forests.

• As long as they are undisturbed both ecosystems are healthy.

• Polar ecosystems are less important.

A farmer wants to increase the species biodiversity on his farm. Which of these actions would be most effective?

• plant large numbers of many different crops on the farm

• raise a few organisms of many different species

• genetically modify the seeds of one crop

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