Ch.20 Crustaceans

Question 1

What is the primary material composing the cuticle of crustaceans?
a. Calcium carbonate
b. Silica
c. Chitin
d. Keratin

Answer 1

c. Chitin

Question 2

How many pairs of antennae do crustaceans typically possess?
a. One pair
b. Two pairs
c. Three pairs
d. Four pairs

Answer 2

b. Two pairs

Question 3

Which subphylum of crustaceans contains the largest class, Malacostraca?
a. Oligostraca
b. Xenocarida
c. Vericrustacea
d. Malacostraca

Answer 3

d. Malacostraca

Question 4

What is the primary function of the rostrum and telson in Malacostraca?
a. Sensory perception
b. Locomotion
c. Protection
d. Reproduction

Answer 4

c. protection

Question 5

Which characteristic describes the appendages of crustaceans?
a. Uniramous
b. Biramous
c. Triramous
d. Multiramous

Answer 5

b. Biramous

Question 6

What is the primary method of gas exchange in larger crustaceans?
a. Diffusion across the cuticle
b. Tracheal system
c. Gills
d. Book lungs

Answer 6

c.Gills

Question 7

Which larval form is common in the crustacean life cycle?
a. Trochophore larva
b. Nauplius larva
c. Planula larva
d. Veliger larva

Answer 7

b. Nauplius larva

Question 8

Which group of crustaceans includes fairy shrimp, brine shrimp, and water fleas?
a. Remipedia
b. Cephalocarida
c. Branchiopoda
d. Malacostraca

Answer 8

c. Branchiopoda

Question 9

Why are crustaceans considered successful in diversifying?
a. Due to their ability to live in terrestrial habitats
b. Limited competition with other arthropod groups
c. Exploitation of various aquatic environments
d. Lack of specialized adaptations in appendages

Answer 9

c. Exploitation of various aquatic environments

Question 10

The major body space in arthropods is the
Coelom
Pseudocoelom
Hemocoel
Blastocoel
Pseudocoelom

Answer 10

Hemocoel

Question 11

The body plan of members of the class Malacostraca shows a standard pattern of appendage arrangement along the entire body that suggests
Serial homology
Telsonization
Arthropodization
Analogous homology
Convergent evolution

Answer 11

Serial homology

Question 12

The photoreceptor cells in the crustacean compound eye are called
Statocysts
Statoliths
Tactile hairs
Gastroliths
Ommatidia

Question 13

Crustacea are “biramous”, meaning they have
A tail referred to as a telson
Two large pincers
Two pairs of antennae
Jointed appendages, each with two brances
A body divided into two regions, the cephalothorax and the abdomen

Answer 13

Jointed appendages, each with two brances

Question 14

The group of Crustacea with the most ancestral features, including a long trunk with fairly uniform appendages, is the
Maxillopoda
Cirripedia
Isopoda
Decapoda
Remipedia

Answer 14

Remipedia

Question 15

The respiratory apparatus of a crayfish is
A set of gills under the carapace
Book lungs inside the carapace
A set of gills along the underside of the tail
Tracheal tubes throughout the body
A cluster of alveoli under the tail

Answer 15

A set of gills under the carapace

Question 16

The oldest ancestral and most widely-occurring larva in the Crustacea is
A juvenile resembling the adult
The trochophore
The veliger
The nauplius
A planula

Answer 16

The nauplius

Question 17

Marine crustaceans that are sessile, secrete calcareous plates and filter-feed are
Ostracods
Barnacles
Copepods
Decapods
Isopods

Answer 17

Barnacles