Lab 11 Insects

Question 1

How are insects different from other hexapods

Answer 1

1. Insects have external mouth parts
2. Their antenna contain a motion sensory tube receptor called Johnston’s organ
3. Insects have trachea to do gas exchange

Question 2

Complete metamorphosis and give an example

Answer 2

The change between stages is dramatic

Example: butterflies

Question 3

Incomplete metamorphosis and give an example

Answer 3

Changes in the insect between stages are gradual

Ex grasshoppers

Question 4

Unique traits of Coleoptera

Answer 4

• beetles

- elytra (second pair of wings that covers their flight wings and makes a line on their back)

Question 5

Lepidoptera

Answer 5

• butterflies and moths
• overlapping scales on wings that let them fly, appears as powder when they fall off
• if they lose too much, they can’t fly

Question 6

What is the difference between butterflies and moths

Answer 6

They have different antennae. Moths have fuzzy antennae and butterflies are non fuzzy skinny with black dots

Question 7

Hemiptera

Answer 7

• true bugs
• triangular shield on back
• half wing (clear tips)

Question 8

Homoptera

Answer 8

• plant and tree hoppers

- wings make a tent over the abdomen

Question 9

Hymenoptera

Answer 9

• ants, bees, wasps

- constructed waist

Question 10

Diptera

Answer 10

• flies
• one pair of wings (2 wings total)
• halteres: paddle like structures used for stabilization

Question 11

Dermaptera

Answer 11

• earwigs

- have cerci used to sense surrounding environment some have been modified to pincers

Question 12

Orthoptera

Answer 12

• grasshoppers, katydids, and crickets

- ovipositor: used to deposit eggs into the soil

Question 13

Blattodea

Answer 13

• roaches

- wings overlap across thorax and abdomen

Question 14

Odonata

Answer 14

• dragonflies and damselflies
• aquatic naiads (larva)
• aerial adults

Question 15

Tagmata of insects

Answer 15

Head: sensory
Thorax: movement (wings and legs attached here)
Abdomen: reproduction

Question 16

What is instar

Answer 16

Instar are the immature stages of insects between molts

Question 17

What are spiracles

Answer 17

Tiny holes along the abdomen that are used for gas exchange they open and close to minimize water loss

Question 18

What is the ovipositor used for?

Answer 18

It is used to deposit eggs into the soil

Question 19

What order has halteres

Answer 19

Diptera

Question 20

What is sexual dimorphism. Know the examples of carpenter bee and Dobson fly

Answer 20

• distinct difference in size or appearance between the sexes
• bees males are yellow and females are black
• Dobson fly males have a larger mouthparts than females