AnswersAHS Biology CR PrescriptiveIdentifying Unknown Organisms

Identifying Unknown Organisms Answers

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1
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Amaya collected insects in the forest. She was unable to identify one unusual looking insect using a dichotomous key. Amaya concluded that the insect must be a new species. Which facts would support the conclusion that the insect is a new species?

A
The insect cannot be identified based on one of the first three questions.
B
The way the insect was collected may have caused damage to its exoskeleton and wings.
C
Several other thorough and up-to-date dichotomous keys also failed to identify the insect.
D
The normal diet of many insects in the forest has been seriously altered by a recent drought.
2
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A botanist observes a large population of a particular type of beetle eating the leaves of one tree but not the leaves of a nearby tree. What should the botanist do first to study the interaction of these organisms in the ecosystem?

A
Remove the beetle population from the tree, and study them in the lab.
B
Identify the species of the beetle and the species of both trees.
C
Determine why the beetle is eating one tree but not the other.
D
Recommend a treatment that will keep the beetles from eating the trees.
3

Refer to this portion of a dichotomous key for fish identification to answer the question.1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 25. (a) Has small fin on back near tail ® 6 (b) Has no fin on back near tail ® 76. (a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 10What do the numbers after the arrows represent?

A
the number of the question that should be considered next
B
the number of steps remaining before the organism is identified
C
the number of questions that need to be answered
D
the number of species that have the described characteristic
4

Dichotomous keys ask

A
open-ended questions about animal behavior.
B
open-ended questions about easily observable characteristics.
C
yes-or-no questions about animal behavior.
D
yes-or-no questions about easily observable characteristics.
5

Rory is trying to identify a tree from one of its leaves. A question on the dichotomous key that he is using asks whether the leaf has 3-5 lobes or more than 5 lobes. Rory cannot tell whether the leaf in his hand has 5 or 6 lobes. What should Rory do to continue identifying the tree?

A
Look at other leaves from the same tree, and count how many lobes they have.
B
Skip this question, since one question does not make a difference.
C
Start over from the beginning of the dichotomous key.
D
Find a different dichotomous key to use that does not ask this question.
6

Refer to this portion of a dichotomous key for fish identification to answer the question.1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 25. (a) Has small fin on back near tail ® 6 (b) Has no fin on back near tail ® 76. (a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 10According to this dichotomous key, any catfish must have

A
a double dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
B
a single dorsal fin, no small fin on the back near the tail, and barbs near the mouth.
C
a double dorsal fin, a small fin on the back near the tail, and no barbs near the mouth.
D
a single dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
7

A series of choices between two characteristics that is used to identify organisms is called a

A
characteristic chart.
B
characteristic key.
C
dichotomous chart.
D
dichotomous key.
8

A biologist is using a dichotomous key to identify fish.1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 22. (a) One fin is spiny, the other is smooth ® 3 (b) One fin is not spiny or smooth ® 45. (a) Has small fin on back near tail ® 6 (b) Has no fin on back near tail ® 76. (a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 107. (a) Tail is asymmetrical ® 8 (b) Tail is symmetrical ® 910. (a) Scales are small ® Trout (b) Scales are large ® WhitefishWhat is the next step to take to identify a fish that has a single dorsal fin and no fin on the back near the tail?

A
step 5
B
step 2
C
step 7
D
step 6
9

Observations of organisms include

A
descriptions of why the organism has certain traits.
B
descriptions of the number, size, and arrangement of parts of the organism.
C
conclusions made about the characteristics of an organism.
D
conclusions made based on an organism’s DNA.
10

Which best describes a dichotomous key?

A
Each step has two choices.
B
Each step can have any number of choices.
C
Each step describes two possible inferences.
D
Each step is based on genetic traits.

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