Question 1

Which of the following features is unique to annelids (phylum Annelida) among the animal phyla discussed?

Accepted Answer

A body cavity partitioned by membrane walls with repeated structures in each segment

Question 2

Which of the following best explains why arthropods must molt (undergo ecdysis) as they grow?

Accepted Answer

Their exoskeleton does not grow, so it must be shed and replaced with a larger one

Question 3

Which of the following is NOT a characteristic shared by all insects?

Accepted Answer

Wings present in all species

Question 4

A scientist discovers a new animal with the following features: a dorsal, hollow nerve cord; a notochord; pharyngeal slits; and a muscular post-anal tail. To which phylum does this animal most likely belong?

Accepted Answer

Chordata

Question 5

Which of the following statements about the water vascular system in echinoderms is correct?

Accepted Answer

It is a network of water-filled canals that branch into tube feet, used for movement and feeding

Question 6

Which of the following is a major evolutionary advantage of complete metamorphosis in insects?

Accepted Answer

It reduces competition between larval and adult stages by allowing them to occupy different ecological niches

Question 7

Which of the following best describes the circulatory system of an earthworm?

Accepted Answer

Closed circulatory system with blood confined to vessels

Question 8

Which of the following lineages of arthropods is characterized by claw-like feeding appendages and includes spiders and scorpions?

Accepted Answer

Chelicerates

Question 9

A millipede and a centipede are both myriapods. Which feature distinguishes millipedes from centipedes?

Accepted Answer

Millipedes have two pairs of short legs per body segment, while centipedes have one pair of long legs per segment

Question 10

Which of the following is a function of segmentation in animals such as annelids and arthropods?

Accepted Answer

Allows for specialization of body regions and more efficient movement

Question 11

Which of the following is a defining feature of echinoderms that distinguishes them from other animal phyla?

Accepted Answer

Radial symmetry as adults and a water vascular system

Question 12

Which of the following best describes the evolutionary significance of homeotic genes in insects?

Accepted Answer

They control the timing and location of segment development, leading to specialized appendages and body regions

Question 13

Which of the following is NOT a characteristic of chordates?

Accepted Answer

Exoskeleton made of chitin

Question 14

Which of the following statements about the digestive system of annelids is correct?

Accepted Answer

It is a one-way tube that passes through all segments but is not itself segmented

Question 15

Which of the following is a reason for the extraordinary success of insects?

Accepted Answer

A waterproof cuticle that prevents desiccation

Question 16

Which of the following best describes the function of tube feet in echinoderms?

Accepted Answer

They are extensions of the water vascular system used for movement and feeding

Question 17

Which of the following is true about tunicates and lancelets?

Accepted Answer

They are chordates that lack a backbone and use pharyngeal slits for suspension feeding

Question 18

Which of the following is a correct comparison between open and closed circulatory systems?

Accepted Answer

In a closed circulatory system, blood remains enclosed in vessels throughout the body

Question 19

Which of the following is a real-world example of the medical use of an annelid?

Accepted Answer

Leeches are used to drain blood from patients in certain medical procedures

Question 20

Which of the following equations correctly represents the relationship between the number of segments ($$n$$), the number of pairs of legs in a millipede ($$L$$), and the fact that millipedes have two pairs of legs per segment?

Accepted Answer

$$L = 4n$$

Invertebrate Diversity: Annelids, Arthropods, Echinoderms, and Chordates

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