Module 12

Question 1

Exoskeleton

Answer 1

A body covering, typically made of chitin, that provides support and protection

Question 2

molt

Answer 2

To shed an old outer covering so that it can be replaced with a new one.

Question 3

thorax

Answer 3

The body region between the head and the abdomen

Question 4

abdomen

Answer 4

The body region posterior to the thorax.

Question 5

cephalothorax

Answer 5

A body region composed of the head and thorax fused together

Question 6

compound eye

Answer 6

An eye made of many lenses, each with a very limited scope.

Question 7

simple eye

Answer 7

An eye with only one lens.

Question 8

open circulatory system

Answer 8

A circulatory system that allows the blood to flow out of the blood vessels and into various body cavities so that the cells are in direct contact with the blood.

Question 9

statocyst

Answer 9

The organ of balance in a crustacean

Question 10

Gonad

Answer 10

A general term for the organ that produces gametes.

Question 11

complete metamorphosis

Answer 11

Insect development consisting of four stages: egg, larva, pupa, and adult.

Question 12

incomplete metamorphosis

Answer 12

Insect development consisting of three stages: egg, nymph, and adult.

Question 13

Name the five common characteristics among the arthropods.

Answer 13

.Exoskeleton, Body Segmentation, Jointed appendages, Open circulatory system, and a ventral nervous systems are all common in arthropods.

Question 14

Explain the flow of blood in a crayfish, starting from the pericardial sinus.

Answer 14

.

Question 15

What purpose does the green gland serve?

Answer 15

It cleans the blood of its impurities.

Question 16

What structures (besides the gills and gill chamber) are vitally important for respiration in a 
crayfish?

Answer 16

The swimmerets and maxillae are important, without them oxygen rich water would not reach the gills.

Question 17

What happens when a crayfish loses a limb?

Answer 17

the injury gets sealed off to prevent bleeding, and then it regenerates.

Question 18

Where do the fertilized eggs of a crayfish go?

Answer 18

they get attached to swimmerettes.

Question 19

Why do arthropods molt?

Answer 19

they molt because their exoskeletons are to small for their growing bodies.

Question 20

What two appendages are responsible for taste and touch in a crayfish?

Answer 20

.the antennae and antennules.

Question 21

What five characteristics set arachnids apart from the other arthropods?

Answer 21

8 legs, two segments in their body’s, no antennea, book lungs, 8 simple eyes.

Question 22

What are the three basic types of webs that spiders spin?

Answer 22

sheet webs, tangle webs and orb webs.

Question 23

Do all spiders use their silk to spin webs?

Answer 23

.no, some spiders spin trap doors and some fire their webs like projectiles.

Question 24

Why are the spider’s lungs called book lungs?

Answer 24

.the lungs have many layers (pages) that look like a book.

Question 25

What four characteristics set insects apart from the other arthropods?

Answer 25

three pairs of legs, wings, three segments in the body and 2 antennae.

Question 26

Why don’t insects have respiratory systems?

Answer 26

..insects do not need a respiratory system because they have a complex system of trachea’s that allow air to pass through the body.

Question 27

If an insect goes through a pupa stage, does it perform complete metamorphosis or incomplete
metamorphosis?

Answer 27

.the pupa stage only exists in COMPLETE METAMORPHOSIS.

Question 28

What four types of wings exist among insects?

Answer 28

.Membrane wings, scaled wings, leather-like wings and horny wings.

Question 29

Match the orders listed below with the descriptions listed in each letter:

Hymenoptera, Lepidoptera, Coleoptera, Diptera, Orthoptera

a. Insects with two leather-like wings and two membranous wings
b. Social insects with membranous wings
c. Insects with two membranous wings and two membranous balancers
d. Insects with two horny wings and two membranous wings
e. Insects with scaled wings

Answer 29

A.) Orthoptera.
B.) Hymenoptera.
C.) Diptera.
D.) Coleoptera
E.) Lepidoptera.