Question 1

Which of the following statements best describes the symmetry and tissue organization of organisms in the phylum Porifera?

Accepted Answer

They are asymmetrical and lack true tissues.

Question 2

A student observes a marine organism with a single opening for both ingestion and waste removal, tentacles with stinging cells, and a hydrostatic skeleton. To which phylum does this organism most likely belong?

Accepted Answer

Cnidaria

Question 3

Which cell type in sponges is responsible for generating water flow and capturing food particles?

Accepted Answer

Choanocytes

Question 4

Compare the support systems of corals and leuconoid sponges. Which statement is correct?

Accepted Answer

Corals have a skeleton of calcium carbonate, while leuconoid sponges have silica spicules.

Question 5

Which of the following is a key difference between a gastrovascular cavity and a complete digestive tract?

Accepted Answer

A complete digestive tract has two separate openings for ingestion and waste removal, while a gastrovascular cavity has only one opening.

Question 6

Which class of mollusks is characterized by a shell made of eight overlapping dorsal plates and is exclusively marine?

Accepted Answer

Polyplacophora

Question 7

A tapeworm is found in the intestine of a vertebrate host. Which of the following features is unique to tapeworms among Platyhelminthes?

Accepted Answer

Production of reproductive proglottids

Question 8

Which of the following statements about annelids is correct?

Accepted Answer

They are coelomate and have a complete digestive tract with mouth and anus.

Question 9

Which of the following best describes the circulatory system of most mollusks?

Accepted Answer

Open circulatory system with hemocyanin as the oxygen carrier

Question 10

Which of the following is a similarity between cnidarians and flatworms?

Accepted Answer

Both have a single opening used for both digestion and waste removal.

Question 11

A rotifer is observed under a microscope. Which of the following features distinguishes rotifers from annelids?

Accepted Answer

Presence of a pseudocoelom and lack of segmentation

Question 12

Which of the following equations correctly represents the chemical composition of the spicules found in class Calcarea of Porifera?

Accepted Answer

$$CaCO_3$$

Question 13

Which of the following is a function of the mesoglea in cnidarians?

Accepted Answer

Acts as a hydrostatic skeleton and separates the two tissue layers

Question 14

Which of the following statements about reproduction in sponges is correct?

Accepted Answer

Sponges are hermaphroditic and can reproduce both sexually and asexually.

Question 15

Which of the following is a difference between a sandworm (polychaete) and an earthworm (oligochaete)?

Accepted Answer

Sandworms have parapodia and separate sexes, while earthworms lack parapodia and are hermaphroditic.

Question 16

Which of the following is a correct comparison between choanocytes and cnidocytes?

Accepted Answer

Choanocytes are flagellated cells in sponges for filter feeding, while cnidocytes are stinging cells in cnidarians for prey capture.

Question 17

Which of the following best describes the feeding mechanism of bivalve mollusks?

Accepted Answer

They use filter feeding through their gills.

Question 18

Which of the following is a difference between annelids and mollusks?

Accepted Answer

Annelids have segmented bodies, while mollusks generally lack segmentation.

Question 19

Which of the following is a correct statement about the nervous system organization in Rotifera?

Accepted Answer

Rotifers have a cerebral ganglion and a simple nervous layout.

Survey of Major Invertebrate Phyla: Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, and Rotifera

Study Guide - Practice Questions

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