AnswersTPS EdX BiologyIdentifying Unknown Organisms

Identifying Unknown Organisms — Quiz Answers

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1
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Which number on the dichotomous key represents the point of differentiation between organism cap x from organism cap z ?

A
branch 1
B
branch 3
C
branch 5
D
branch 9
2
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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 way the insect was collected may have caused damage to its exoskeleton and wings.
B
The normal diet of many insects in the forest has been seriously altered by a recent drought.
C
Several other thorough and up-to-date dichotomous keys also failed to identify the insect.
D
The insect cannot be identified based on one of the first three questions.
3

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
Start over from the beginning of the dichotomous key.
C
Skip this question, since one question does not make a difference.
D
Find a different dichotomous key to use that does not ask this question.
4

Which best describes a dichotomous key?

A
Each step is based on genetic traits.
B
Each step can have any number of choices.
C
Each step describes two possible inferences.
D
Each step has two choices.
5

A scientist wants to study the interactions of different birds in the southern part of a desert. What should the scientist do first?

A
Determine each bird species' migration pattern.
B
Identify each bird species by using a dichotomous key.
C
Determine what foods each bird species eats.
D
Identify local names for each bird species.
6

How is a dichotomous key used?

A
The organism’s DNA is sequenced and compared to the DNA sequences that are listed in the dichotomous key.
B
Observable characteristics of the organism are listed in a group and compared to different groups of observable characteristics listed in the key.
C
The organism is compared to paired pictures of organisms until a match is found in the key.
D
Observable characteristics of the organism are checked through a sequence of two-part steps until an identification is listed in the key.
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 key.
D
dichotomous chart.
8

Observations of organisms include

A
conclusions made about the characteristics of an organism.
B
descriptions of why the organism has certain traits.
C
conclusions made based on an organism’s DNA.
D
descriptions of the number, size, and arrangement of parts of the organism.
9

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
Determine why the beetle is eating one tree but not the other.
B
Identify the species of the beetle and the species of both trees.
C
Remove the beetle population from the tree, and study them in the lab.
D
Recommend a treatment that will keep the beetles from eating the trees.
10

Dichotomous keys ask

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

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