PT141.S4.Q15 > Question

SECTION 1 · rc

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Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

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Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15

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Question 16 Question 17 Question 18 Question 19 Question 20 Question 21

PASSAGE 4

Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 2 · lr

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SECTION 3 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7

PASSAGE 2

Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14

PASSAGE 3

Question 15 Question 16 Question 17 Question 18 Question 19 Question 20

PASSAGE 4

Question 21 Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 4 · lr

Why are the dragonfly populations more likely to remain healthy in areas where red devil crayfish are present than in areas without red devil crayfish, even though the dragonfly larvae can survive only in water, and those larvae can be eaten by red devil crayfish when they are in water?

The correct answer should tell us something beneficial for the dragonflies from being in areas with the red devil crayfish, or something negative from being in areas without red devil crayfish.

This is a benefit for the dragonfly from being in areas with red devil crayfish. Without the water chambers created by the crayfish, larvae might not be able to survive. This may be why dragonfly populations are higher in areas with the crayfish despite the extra predation.

But the crayfish can still eat the dragonfly larvae. We’d still expect the dragonfly population to be better off without the red devil crayfish.

If the crayfish eat the larvae, and don’t eat anything that preys on the larvae, that’s worse for the larvae. We’d expect the dragonfly population to be better off without the red devil crayfish.

The number of places the crayfish is found doesn’t tell us anything beneficial about the crayfish for the dragonfly population. We still don’t know why the dragonfly population is higher in areas with the crayfish than in areas without.

This suggests crayfish might eat other things besides the dragonflies. But they can still eat dragonfly larvae. So, we’d still expect the dragonfly population to be better off without the red devil crayfish.

PrepTest 141 - Section 4 - Question 15

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