AnswersTX-Biology B-CRUnit Test

Lab: Interdependence of Organisms Answers

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21
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Titan triggerfish feed on coral, which is often buried under rocks on the sea floor. To access the coral, these fish turn over rocks. It has been shown that the absence of the titan triggerfish changes the population levels of other species of fish that live in the same coral-reef environment.One can conclude that the are benefited by the . The triggerfish are .

Answer not available
22
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orangeblue bars best represent the group

A
orange
B
blue
23

How could increasing the number of plants help you decrease error in the experiment? Check all possible reasons.

A
It would increase the sampling error.
B
It would reduce the significance of any single measurement error.
C
It would make calculations easier.
D
Having more data would make the average height less affected by one or two plants that are randomly shorter or taller.
E
It would make a plant’s death less of an issue.
24

are benefited by the smaller fish speciestitan triggerfishprey species.

A
smaller fish species
B
titan triggerfish
C
prey species
25

Question text not available

Answer not available
26

Do the data shown support the hypothesis?

A
yes
B
no
C
inconclusive
27

orange✔ blue bars best represent the group

A
orange
B
blue
28

How could increasing the number of plants help you decrease error in the experiment? Check all possible reasons.

A
It would increase the sampling error.
B
It would reduce the significance of any single measurement error.
C
It would make calculations easier.
D
Having more data would make the average height less affected by one or two plants that are randomly shorter or taller.
E
It would make a plant’s death less of an issue.
29

Why is the interdependence of the worms and plants an example of commensalism?

Answer:

In commensalism, one organism benefits, and the other neither benefits nor is harmed. In this case, plants benefited, and worms seemed neither to benefit nor be harmed.

30

Question text not available

Answer not available
31

The independent variable was the , and the dependent variable was the .

Answers:
Selection 1:number of worms
Selection 2:plant growth
32

without worms, and the orangeblue bars represent the growth of plants with worms.

A
orange
B
blue
33

Compare your response to the sample. Check all ideas that you included.

A
the definition of commensalism
B
the benefits to the plants from the worms
C
the lack of observed harm to the worms
D
the lack of observed benefit to the worms
34

The triggerfish are helpedharmedneither harmed nor helpedboth harmed and helped.

A
helped
B
harmed
C
neither harmed nor helped
D
both harmed and helped
35

The independent variable was the , and the dependent variable was the .

Answers:
Selection 1:number of worms
Selection 2:plant growth
36

without worms, and the ✔ orangeblue bars represent the growth of plants with worms.

A
orange
B
blue
37

Compare your response to the sample. Check all ideas that you included.

A
the definition of commensalism
B
the benefits to the plants from the worms
C
the lack of observed harm to the worms
D
the lack of observed benefit to the worms
38

Question text not available

Answer not available
39

Why does the y-axis of the graph show average height instead of the heights of all twelve individual plants?

A
to compare groups, not individuals
B
to lessen the influence of outliers
C
to clearly see trends
40

The relationship of the triggerfish and other fish is an example of competitionpredationmutualismcommensalismparasitism.

A
competition
B
predation
C
mutualism
D
commensalism
E
parasitism

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