Question 1

A radula is present in members of which clade(s)?

Accepted Answer

Radula, a tongue-like organ with rows of teeth, is present in both chitons and gastropods. Bivalves lack a radula, and cephalopods have a modified radula known as a beak.

Question 2

How many of the following are characteristics of arthropods?
1)protostome development
2)bilateral symmetry
3)a pseudocoelom
4)three embryonic germ layers
5)a closed circulatory system

Accepted Answer

The answer of How many of the following are characteristics...

Question 3

A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange, and modified segmentation. A knowledgeable zoologist should predict that the adults of this species would also feature

Accepted Answer

The presence of an exoskeleton, a system of tubes for gas exchange (tracheal system), and modified segmentation are characteristics associated with arthropods. Among arthropods, an open circulatory system is a common feature, where the blood is not entirely contained within blood vessels but is partially contained in a body cavity called the hemocoel. This allows for the distribution of nutrients and gases to the body tissues. The other options are specific to certain groups within or outside of arthropods and do not directly correlate with the given larval characteristics.

Question 4

Nematode worms and annelid worms share which of the following features?

Accepted Answer

Both nematode worms and annelid worms use fluid in their body cavity as a hydrostatic skeleton to maintain structure and facilitate movement.

Question 5

What distinguishes complete metamorphosis from incomplete metamorphosis in insects?

Accepted Answer

Complete metamorphosis involves a complete transformation in appearance, behavior, and habitat between the larval stage and the adult stage. In contrast, incomplete metamorphosis involves a more gradual change in appearance and behavior, with the immature stages resembling miniature versions of the adult stage. The presence of wings and sex organs may or may not be present throughout the life cycle, and is not a distinguishing factor between the two types of metamorphosis.

Question 6

One should expect to find the "9 + 2 pattern" of microtubules in association with the feeding apparatus of which of the following?

Accepted Answer

The answer of One should expect to find the "9...

Question 7

How many of the following can be used to distinguish a nematode worm from an annelid worm?
1)type of body cavity
2)number of muscle layers in the body wall
3)presence of segmentation
4)number of embryonic tissue layers
5)shape of worm in cross-sectional view

Accepted Answer

Nematodes have a pseudocoelom, while annelids have a true coelom (1). Nematodes have a single layer of longitudinal muscles, whereas annelids have both longitudinal and circular muscles (2). Annelids are segmented, while nematodes are not (3).

Question 8

Infection with which parasite might cause excessive elasticity in human skeletal muscles?

Accepted Answer

Trichinella worms can cause trichinosis, a disease that results in excessive elasticity, soreness, and weakness in skeletal muscles.

Question 9

Which of the following is found only among annelids?

Accepted Answer

A clitellum is a feature unique to annelids, particularly within the subclasses Oligochaeta (which includes earthworms) and Hirudinea (leeches). It secretes a cocoon for the eggs, distinguishing these creatures from others listed.

Question 10

Among the invertebrate phyla, phylum Arthropoda is unique in possessing members that have

Accepted Answer

Arthropoda is unique among invertebrate phyla for having members with wings, which allow for flight. This feature is not found in any other invertebrate phylum.

Question 11

The possession of two pairs of antennae is a characteristic of

Accepted Answer

Crustaceans are characterized by having two pairs of antennae, distinguishing them from other arthropods like insects, spiders, centipedes, and millipedes, which have either one pair or none.

Question 12

Which of the following are entirely, or partly, composed of calcium carbonate?

Accepted Answer

Coral animals' exoskeletons are partly composed of calcium carbonate, which they secrete to form a hard protective structure around themselves.

Question 13

Which mollusc clade includes members that undergo embryonic torsion?

Accepted Answer

Gastropods are the only mollusc clade that includes members that undergo embryonic torsion, a process that rotates the visceral mass and mantle 180 degrees, resulting in the anus and mantle cavity being located above the head.

Question 14

The heartworms that can accumulate within the hearts of dogs and other mammals have a pseudocoelom, an alimentary canal, and an outer covering that is occasionally shed. To which phylum does the heartworm belong?

Accepted Answer

Heartworms possess a pseudocoelom (a fluid-filled body cavity), an alimentary canal, and an outer covering that is occasionally shed. These characteristics indicate that they belong to the phylum Nematoda, which includes roundworms. Platyhelminthes (A) are flatworms, Arthropoda (B) are characterized by a segmented body and joined appendages, Acoela (D) are a group of small marine flatworms, and Annelida (E) are segmented worms such as earthworms and leeches.

Question 15

You find a small animal with eight legs crawling up your bedroom wall. Closer examination will probably reveal that this animal has

Accepted Answer

The answer of You find a small animal with eight...

Question 16

A shared derived characteristic for members of the arthropod subgroup that includes spiders would be the presence of

Accepted Answer

Chelicerae are specialized mouthparts that are a shared derived characteristic of the subgroup Chelicerata, which includes spiders.

Question 17

A student observes a wormlike organism crawling about on dead organic matter. Later, the organism sheds its outer covering. One possibility is that the organism is a larval insect (like a maggot). However, it might be a member of the phylum ________, and one way to distinguish between the two possibilities is by looking for ________.

Accepted Answer

The answer of A student observes a wormlike organism crawling...

Question 18

Humans most frequently acquire trichinosis by

Accepted Answer

Trichinosis is caused by eating undercooked pork that is infected with the larvae of the Trichinella worm. It is important to cook pork to an internal temperature of 160°F to kill the larvae and prevent trichinosis. The other options (A, C, D, and E) are not correct as they do not involve the transmission of Trichinella worms to humans.

Question 19

Which of the following is a characteristic of nematodes?

Accepted Answer

Nematodes have only longitudinal muscles, which means they can only move by contracting and relaxing their muscles in a back-and-forth motion. They do not have circular muscles, like most other animals.

Question 20

A terrestrial mollusc without a shell belongs to which clade?

Accepted Answer

Gastropods are a diverse group of mollusks that includes terrestrial snails and slugs. Some gastropods do have shells, but others have evolved to lose their shells and adapt to life on land without this protective covering.

Quiz 33: An Introduction to Invertebrates

A radula is present in members of which clade(s) ?

How many of the following are characteristics of arthropods? 1) protostome development 2) bilateral symmetry 3) a pseudocoelom 4) three embryonic germ layers 5) a closed circulatory system