Question 1

Which of the following characteristics distinguishes members of the phylum Porifera from other animal phyla?

Accepted Answer

Lack of true tissues

Question 2

Cnidarians possess specialized cells called cnidocytes. What is the primary function of the nematocyst found within these cells?

Accepted Answer

Defense and capture of prey

Question 3

Which developmental feature is shared by all deuterostomes?

Accepted Answer

Radial cleavage and formation of the anus from the blastopore

Question 4

Flatworms (Platyhelminthes) are described as acoelomates. What does this mean?

Accepted Answer

They lack a body cavity between the digestive tract and body wall

Question 5

Which of the following is a major evolutionary advantage of the arthropod exoskeleton?

Accepted Answer

Provides protection and prevents dehydration

Question 6

Which animal group is characterized by a water vascular system and radial symmetry?

Accepted Answer

Echinodermata

Question 7

A lobster is classified as a decapod crustacean. What does 'decapod' refer to?

Accepted Answer

Having ten walking appendages

Question 8

Which of the following best describes the nervous system of planarians (a type of flatworm)?

Accepted Answer

Centralized nervous system with ganglia and ventral nerve cords

Question 9

Which phylum includes animals that are filter feeders and lack true tissues?

Accepted Answer

Porifera

Question 10

Which of the following statements about molluscs is correct?

Accepted Answer

Molluscs are soft-bodied animals, often protected by a shell of calcium carbonate ($$CaCO_3)$$

Question 11

Which of the following is a defining feature of the Lophotrochozoa clade?

Accepted Answer

Presence of a lophophore or trochophore larval stage

Question 12

Which animal group is most closely associated with the Cambrian explosion and the colonization of land due to the evolution of the exoskeleton?

Accepted Answer

Arthropoda

Question 13

Which of the following is true about the development of deuterostomes?

Accepted Answer

The blastopore becomes the anus

Question 14

Which of the following is a real-world example of a parasitic nematode that can infect humans?

Accepted Answer

Trichinella spiralis

Question 15

Which of the following best describes the function of parapodia in errant annelids?

Accepted Answer

Gas exchange and locomotion

Question 16

Which of the following is NOT a characteristic of the phylum Cnidaria?

Accepted Answer

Centralized nervous system

Question 17

Which of the following is a correct equation for the chemical composition of the mollusc shell?

Accepted Answer

$$CaCO_3$$

Question 18

Which of the following best explains why the evolution of jointed appendages was significant for arthropods?

Accepted Answer

It enabled specialized functions such as sensing, feeding, and locomotion

Question 19

Which of the following is a distinguishing feature of cephalopods compared to other molluscs?

Accepted Answer

Foot modified into tentacles and a complex brain

Question 20

Which of the following best describes the process of ecdysis in Ecdysozoans?

Accepted Answer

Shedding of the cuticle to allow for growth

An Introduction to Invertebrates

Study Guide - Practice Questions