Answers 24 - 25 CR - Biology B 0411KBFactors Affecting Biological Diversity-Standard Bio 4.4

Identifying Unknown Organisms Answers

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Use this chart of a portion of a dichotomous key to answer the question.Dichotomous KeyWhich number on the dichotomous key represents the point of differentiation between organism X from organism Z?

branch 1

branch 3

branch 5

branch 9

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Observations of organisms include

descriptions of why the organism has certain traits.

descriptions of the number, size, and arrangement of parts of the organism.

conclusions made about the characteristics of an organism.

conclusions made based on an organism’s DNA.

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 double dorsal fin, a small fin on the back near the tail, and barbs near the mouth.

a single dorsal fin, no small fin on the back near the tail, and barbs near the mouth.

a double dorsal fin, a small fin on the back near the tail, and no barbs near the mouth.

a single dorsal fin, a small fin on the back near the tail, and barbs near the mouth.

Which is a correct observation based on the photo shown below?

The bird’s coloring indicates that it lives in trees with green and yellow leaves.

The bird has a narrow beak that is longer than the length of its head.

The bird probably uses its long beak to reach the nectar inside flowers.

The bird must inhabit a cold climate since there is ice on the branches.

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?

Look at other leaves from the same tree, and count how many lobes they have.

Skip this question, since one question does not make a difference.

Start over from the beginning of the dichotomous key.

Find a different dichotomous key to use that does not ask this question.

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

characteristic chart.

characteristic key.

dichotomous chart.

dichotomous key.

The mammal pictured below is a silvery mole rat.Which statement is an inference based on the picture?

The animal has an open mouth.

The animal has hairless feet with sharp claws.

The animal has prominent upper and lower incisor teeth.

The animal likely has poor vision since its eyes are so small.

Use this dichotomous key for insect identification to identify the insect shown.1.a. Insect has one pair of wings.Order Diptera b. Insect has two pairs of wings.Go to #2 2.a. Front wings thicker in texture than hind wingsGo to #3. b. Front and hind wings are same texture throughout.Go to #4 3.a. Front wings are short Order Dermaptera b. Front wings cover entire abdomenOrder Coleoptera 4.a. Wings with scale on all parts of their area. order Lepidoptera b. Wings without scalesGo to #5. 5.a. Hind wings smaller than front wings.Order Ephemeroptera b. Front and hind wings nearly equal in size.Order OdonataThe insect pictured is in the order

Diptera.

Ephemeroptera.

Coleoptera.

Odonata.

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

Identify local names for each bird species.

Determine what foods each bird species eats.

Identify each bird species by using a dichotomous key.

Determine each bird species' migration pattern.

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?

step 5

step 2

step 7

step 6

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Identifying Unknown Organisms Answers

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