Ch.19 Trilobites, Chelicerates, Myriapods

Question 1

What term refers to the hard external skeleton of arthropods?
a. Endoskeleton
b. Exoskeleton
c. Mesoskeleton
d. Hydrostatic skeleton

Answer 1

b. Exoskeleton

Question 2

Which of the following is NOT a characteristic of arthropods?
a. Segmented body
b. Jointed appendages
c. Soft exoskeleton
d. Well-developed organ systems

Answer 2

c. Soft exoskeleton

Question 3

Which arthropod subphylum includes spiders, ticks, mites, scorpions, and horseshoe crabs?
a. Trilobita
b. Myriapoda
c. Chelicerata
d. Crustacea

Answer 3

c. Chelicerata

Question 4

What is the primary reason for the versatility of the arthropod body plan?
a. Presence of a soft exoskeleton
b. Lack of segmentation
c. Fusion of body segments
d. Combination of exoskeleton, segmentation, and appendages

Answer 4

d. Combination of exoskeleton, segmentation, and appendages

Question 5

How do aquatic and terrestrial arthropods differ in obtaining oxygen?
a. Aquatic arthropods breathe through tracheae.
b. Terrestrial arthropods have gills for respiration.
c. Aquatic arthropods use book lungs for oxygen exchange.
d. Terrestrial arthropods use a tracheal system for oxygen transport.

Answer 5

d. Terrestrial arthropods use a tracheal system for oxygen transport.

Question 6

What is the primary benefit of metamorphosis in arthropods?
a. It allows for faster growth and development.
b. It prevents competition between larvae and adults.
c. It facilitates adaptation to changing environments.
d. It increases the lifespan of the organism.

Answer 6

b. It prevents competition between larvae and adults.

Question 7

Which characteristic is typical of chelicerates?
a. Three pairs of antennae
b. Presence of wings
c. Two tagmata: cephalothorax and abdomen
d. Lack of segmentation

Answer 7

c. Two tagmata: cephalothorax and abdomen

Question 8

What is a common characteristic of horseshoe crabs, sea spiders, and arachnids?
a. Presence of compound eyes
b. Lack of appendages
c. Four pairs of walking legs
d. Jointed pedipalps

Answer 8

c. Four pairs of walking legs

Question 9

Spider silk
Is very strong but cannot be stretched without breaking
Only is produced by those orb web spiders that form webs to catch insects
Is formed as solid coiled threads internally that can be uncoiled and used whenever needed
Is used differently by different spider species
All of the choices are correct

Answer 9

Is used differently by different spider species

Question 10

The mites and ticks carry their mouthparts on a little anterior projection called the
Hypostome
Rostrum
Capitulum
Pedipalp
Pectin

Answer 10

Capitulum

Question 11

Spiders breathe by means of
Gills
Diffusion across the soft cuticle
An extensive system of tracheae more complex than is found in insects
Book lungs or primitive tracheae
Coxal glands

Answer 11

Book lungs or primitive tracheae

Question 12

The millipedes
Bear two pairs of legs on most body segments
Are very beneficial because they feed on insects
Are more active than centipedes because they have more legs
Have flattened bodies in contrast to centipedes
Lack spiracles and tracheae and therefore differ from centipedes

Answer 12

Bear two pairs of legs on most body segments

Question 13

Arthropods are
Carnivorous
Herbivorous
Omnivorous
All of the choices are correct
Choices A and B are correct

Answer 13

All of the choices are correct

Question 14

Eurypterids
Resembled insects
Are extinct
Are called sea spiders
Were very small aquatic scorpions
Were huge ancient scorpions that wandered around on land

Answer 14

Are extinct

Question 15

Members of the class Arachnida have
A cephalothorax and abdomen
Antennae
Mandibles
Five pairs of walking legs
All of these choices ae arachnid features

Answer 15

A cephalothorax and abdomen

Question 16

Sea spiders
Are extinct
Feed on fluids of softbodied animals such as cnidarians
Resemble crustaceans
Have an unusually large abdomen
Are marine arachnid spiders

Answer 16

Feed on fluids of softbodied animals such as cnidarians

Question 17

Chelicerate arthropods possess
Pedipalps
Antennae
Mandibles
Three pairs of walking legs
All of the choices are chelicerate features

Answer 17

Pedipalps

Question 18

The term “myriapod” includes
All arthropods, gastropods, and brachiopods
All of the arthropods with multiple appendages
Insects and their ancestors
All arthropods except arachnids and crustaceans
Centipedes, millipedes (along with pauropods and symphylans)

Answer 18

Centipedes, millipedes (along with pauropods and symphylans)

Question 19

For scorpions, mating is particularly worrisome since the female can eat the male. Therefore, the male scorpion
Uses the same procedure as male spiders
Holds the females pincers in a “dance” position, deposits a spermatophore on the ground and dances her over it
Transfers a spermatophore from between his body segments directly into hers
Fertilizes her by hypodermic insemination where the sperm is injected inside her body cavity
Still uses regular mating since this copulatory position keeps her facing away safely

Answer 19

Holds the females pincers in a “dance” position, deposits a spermatophore on the ground and dances her over it

Question 20

Which of the following spiders is considered fatally venomous in North America?
a. Daddy longlegs
b. Wolf spiders
c. Brown recluse
d. Orb-weaver spiders

Answer 20

c. Brown recluse