Relationships Among Organisms Answers

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Why are invasive species dangerous to the environment?

A
They pollute the environment.
B
They are always predators.
C
They threaten biodiversity.
D
They bring abiotic factors.
4

Which is most likely to help an introduced species become invasive?

A
a low reproductive rate
B
big difference between original and new habitats
C
a strong predator in new habitat
D
great tolerance to a wide range of conditions
11

As human travel increases, the number of introduced species likely

A
decreases.
B
increases.
C
stays the same.
D
is eliminated.
12

When an insect touches the bristles on the lobes of a Venus flytrap, the lobes close quickly, engulfing the insect. The movement of the insect inside the lobes causes the flytrap to secrete digestive enzymes that kill the insect. Which type of relationship does this describe?

A
competition
B
parasitism
C
predation
D
commensalism
14

Bears and salmon have a predator-prey relationship. What would most likely happen to the bear population if the salmon population increased?

A
stay the same
B
decrease
C
increase
D
become extinct
16

The cane toad, or Rhinella marina, was introduced to the Hawaiian Islands in 1932 by sugar cane farmers. The farmers released the toads in their crops to help control pests that were damaging the sugar cane. The cane toad has few natural predators because it secretes a poisonous toxin that kills the animals that consume it. As a result, the cane toad population thrived, and by 1935, it numbered hundreds of thousands. Which role does the cane toad play in the Hawaiian Islands?

A
native species
B
invasive species
C
reintroduced species
D
endangered species
17

Why are invasive species dangerous to the environment?

A
They pollute the environment.
B
They are always predators.
C
They threaten biodiversity.
D
They bring abiotic factors.
18

Some flowering plants are pollinated by honeybees. At some time in the past, honeybees evolved the ability to see ultraviolet radiation. Some flowers have evolved to produce ultraviolet markers on their petals that direct honeybees to the reproductive parts of the flower. What is this an example of?

A
mutualism
B
commensalism
C
predation
D
coevolution
19

What is the name that is given to a symbiotic relationship in which both species benefit?

A
commensalism
B
mutualism
C
parasitism
D
predation
20

The pine borer beetle is a parasite to the pine tree. What would most likely happen to the pine tree population if the beetle population decreased?

A
decrease
B
increase
C
become extinct
D
stay the same

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