Question 1

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 2

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 animal is likely an arachnid, such as a spider, which typically has no antennae and possesses chelicerae.

Question 3

Which of the following have distinct central disks and long, flexible arms?

Accepted Answer

Class Ophiuroidea, or brittle stars, have a distinct central disk and long, flexible arms, which differentiates them from other echinoderms.

Question 4

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

Accepted Answer

The answer of Nematode worms and annelid worms share which...

Question 5

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

Accepted Answer

Chelicerae are specialized mouthparts found in the arthropod subgroup that includes spiders. Other arthropod subgroups have different mouthparts.

Question 6

What distinguishes complete metamorphosis from incomplete metamorphosis in insects?

Accepted Answer

Both complete and incomplete metamorphosis include the presence of wings and sex organs in the adult stage. The main distinguishing feature is the degree of change in appearance between earlier life stages and the adult stage. In complete metamorphosis, the larvae are completely different in appearance and lifestyle from the adult stage (e.g. caterpillars develop into butterflies), while in incomplete metamorphosis, the immature stages resemble miniature versions of the adult (e.g. grasshoppers). Therefore, option C is the correct answer.

Question 7

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 8

While working in your garden, you discover a worm-like, segmented animal with two pairs of jointed legs per segment. The animal is probably a

Accepted Answer

The animal is likely a millipede, as millipedes are characterized by having two pairs of jointed legs per body segment.

Question 9

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 10

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 its adults would also feature

Accepted Answer

The characteristics described are typical of arthropods, which have an open circulatory system as adults.

Question 11

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 12

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

Accepted Answer

Trichinella worms are known to cause trichinosis, which can lead to muscle pain, weakness, and excessive elasticity in human skeletal muscles.

Question 13

Which 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

Arthropods exhibit protostome development, bilateral symmetry, and have three embryonic germ layers. They have a true coelom, not a pseudocoelom, and an open circulatory system, not a closed one.

Question 14

Which of the following is a characteristic of adult echinoderms?

Accepted Answer

Adult echinoderms exhibit secondary radial symmetry, meaning they have a five-part body plan with similar structures arranged radially around a central axis. This is a characteristic unique to echinoderms and sets them apart from other animal groups. Spiral cleavage is a characteristic of some groups of animals during their embryonic development, but is not a characteristic of adult echinoderms. Gastrovascular cavities are found in cnidarians and some other animal groups, but not echinoderms. Exoskeletons are found in some animal groups, but not all echinoderms have them. Lophophores are found in certain groups of aquatic invertebrates, such as bryozoans and phoronids, but not in echinoderms.

Question 15

Which of the following can extend the stomach through their mouth to feed?

Accepted Answer

Sea stars (class Asteroidea) can extend their stomachs out of their mouths to externally digest food.

Question 16

Which 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, annelids have a coelom. Nematodes have a single layer of muscles in the body wall, annelids have multiple layers. Nematodes are not segmented, annelids are segmented.

Question 17

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 have a pseudocoelom (a fluid-filled cavity that is not lined by mesoderm), an alimentary canal (digestive tube with separate mouth and anus), and an outer covering that is occasionally shed, which are characteristics of the phylum Nematoda (roundworms).

Question 18

A student observes a worm-like 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). On the other hand, it might be a member of which phylum, and one way to distinguish between the two possibilities is by looking for the presence of

Accepted Answer

The answer of A student observes a worm-like organism crawling...

Question 19

Which of the following are elongated in the oral-aboral axis?

Accepted Answer

Sea cucumbers (class Holothuroidea) are elongated along the oral-aboral axis, unlike other echinoderms which have a more radial symmetry.

Question 20

Which of the following characteristics most likely explains why insects are so successful at dispersing to distant environments?

Accepted Answer

Wings allow insects to fly and travel long distances quickly, making them highly effective at dispersing to distant environments.

Quiz 33: Invertebrates