AnswersCA-Life Science B High SchoolLab: Interdependence of Organisms

Lab: Interdependence of Organisms Answers

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Answers:
Selection 1:smaller fish species
.:titan triggerfish
.:neither harmed nor helped
2
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number of seeds sprouted✔ plant growthworm growth

A
number of seeds sprouted
B
plant growth
C
worm growth
3

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

Answers:
Selection 1:number of worms
Selection 2:plant growth
4

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
5

In this experiment, you changed the and measured the effect of this change on the in the population.

Answers:
Selection 1:number of worms in the soil
Selection 2:plant growth
6

Plant Growth

Answer:

6

7

Do the data shown support the hypothesis?✔ yesnoinconclusive

A
✔ yes
B
no
C
inconclusive
8

The graph to the right represents the data of this lab using a scatterplothistogrambar graphpie graph. The

A
scatterplot
B
histogram
C
bar graph
D
pie graph
9

In this lab, you collected data at the end of Weeks 1, 3, and 5. Suppose you had collected data every day for five weeks instead. Why would a line graph be a better format for this data than a bar graph? Check all that apply.

A
It shows trends over time.
B
You can plot two lines on the same graph.
C
It is a good format to show a whole series of data.
D
The growth pattern is perfectly linear.
10

Check all strategies below that helped you decrease experimental error in this lab.

A
using seeds from the same source
B
using the same kind of soil for both groups
C
giving the control and experimental groups the same volume of water
D
keeping the light the same for the experimental and control groups
E
measuring plant height the same way and at the same time for both groups
11

The results of this experiment show that plants grow more in soil containing worms than in soil without worms. Which factors below helped the plants grow taller? Check all that apply.

A
Worms help move nutrients toward the roots of plants.
B
Worms produce nutrients, such as nitrogen, that are essential for plants to grow.
C
Worms create tunnels that allow the soil to absorb more water.
12

Classify the interaction between worms and lima bean plants: competitionpredationX mutualismcommensalismparasitism

A
competition
B
predation
C
mutualism
D
commensalism
E
parasitism
13

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 smaller fish speciestitan triggerfish prey species

A
smaller fish species
B
titan triggerfish
C
prey species
14

orangeblue bars best represent the group

A
orange
B
blue
15

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.
16

are benefited by the smaller fish speciestitan triggerfishprey species.

A
smaller fish species
B
titan triggerfish
C
prey species
17

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

A
orange
B
blue
18

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
19

The triggerfish are helpedharmedneither harmed nor helpedboth harmed and helped.

A
helped
B
harmed
C
neither harmed nor helped
D
both harmed and helped
20

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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