Lab: Using a Dichotomous Key Answers

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

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 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?

Observations of organisms include

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

Dichotomous keys ask

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

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

Which best describes a dichotomous key?