Question 1

Which of the following animal phyla is correctly matched with its distinguishing characteristic?

Accepted Answer

Platyhelminthes – acoelomate, dorsoventrally flattened body

Question 2

Which of the following phyla belong to the clade Ecdysozoa?

Accepted Answer

Arthropoda and Nematoda

Question 3

What is the primary function of choanocytes in sponges?

Accepted Answer

Generating water flow and capturing food particles

Question 4

Which structure in a sponge is responsible for allowing water to exit the central cavity?

Accepted Answer

Osculum

Question 5

Which of the following best describes the medusa body plan in Cnidaria?

Accepted Answer

Motile, bell-shaped, mouth-down orientation

Question 6

Which class of molluscs is characterized by a shell divided into eight overlapping plates?

Accepted Answer

Polyplacophora

Question 7

Which of the following is a key characteristic of annelids?

Accepted Answer

Segmented body with repeated organs

Question 8

Which molluscan class includes animals such as snails and slugs, and is characterized by a single, often spiraled shell?

Accepted Answer

Gastropoda

Question 9

Which subphylum of arthropods is characterized by having two pairs of antennae and includes crabs and lobsters?

Accepted Answer

Crustacea

Question 10

Which of the following is a distinguishing feature of Cheliceriformes?

Accepted Answer

Chelicerae (fang-like mouthparts)

Question 11

A scientist discovers a new animal with the following features: bilateral symmetry, a pseudocoelom, and it molts its cuticle. To which phylum does this animal most likely belong?

Accepted Answer

Nematoda

Question 12

Which of the following is true about the basic body plan of a mollusc?

Accepted Answer

It includes a muscular foot, visceral mass, and mantle

Question 13

Which class of molluscs is known for having a closed circulatory system and highly developed nervous system?

Accepted Answer

Cephalopoda

Question 14

Which of the following is a function of amoebocytes in sponges?

Accepted Answer

Transporting nutrients and producing spicules

Question 15

Which subphylum of arthropods includes insects and is characterized by three pairs of legs?

Accepted Answer

Hexapoda

Question 16

Which of the following is a correct pairing of molluscan class and example?

Accepted Answer

Polyplacophora – chiton

Question 17

Which animal phylum is characterized by pentaradial symmetry in adults and a water vascular system?

Accepted Answer

Echinodermata

Question 18

Which of the following is a function of spicules in sponges?

Accepted Answer

Providing structural support and defense

Question 19

Which subphylum of arthropods is characterized by having many body segments, each with one or two pairs of legs, and includes centipedes and millipedes?

Accepted Answer

Myriapoda

Question 20

Which of the following statements about the polyp and medusa forms in Cnidaria is correct?

Accepted Answer

The polyp is typically sessile and the medusa is typically motile

Animal Phyla, Body Plans, and Major Groups: Study Guidance

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