Question 1

Which of the following best describes the body symmetry of the animal shown in the first image (sea anemone)?

Accepted Answer

Radial symmetry

Question 2

Which germ layers are present in diploblastic animals such as cnidarians?

Accepted Answer

Ectoderm and endoderm

Question 3

Which developmental mode is characterized by indeterminate cleavage and the blastopore becoming the anus?

Accepted Answer

Deuterostome

Question 4

A cross-section of a triploblastic animal reveals a body cavity completely lined with mesoderm. What is this body plan called?

Accepted Answer

Coelomate

Question 5

Which of the following is a unique feature of the phylum Mollusca, as shown in the diagram of the mollusk body plan?

Accepted Answer

A rasp-like feeding organ called a radula

Question 6

Which animal group is characterized by a pseudocoelom and a complete digestive tract with a mouth and anus?

Accepted Answer

Rotifera

Question 7

Which of the following statements about tapeworms (Platyhelminthes) is correct?

Accepted Answer

They absorb nutrients across their body surface

Question 8

Which of the following is a function of the mesoderm in triploblastic animals?

Accepted Answer

Forms muscles and other internal organs

Question 9

Which of the following best explains why arthropods are considered the most successful animal phylum?

Accepted Answer

They possess a hard exoskeleton, jointed appendages, and high species diversity

Question 10

Which of the following is true about the Cambrian explosion?

Accepted Answer

It was a rapid diversification of bilaterian animals

Question 11

Which animal group is described as having a sac-like body plan with a single opening functioning as both mouth and anus?

Accepted Answer

Cnidaria

Question 12

Which of the following is a characteristic of leeches (Annelida) that allows them to feed on blood without the host noticing?

Accepted Answer

They secrete an anesthetic and hirudin to prevent blood clotting

Question 13

Which of the following best describes the difference between protostome and deuterostome development?

Accepted Answer

Protostomes form the mouth from the blastopore; deuterostomes form the anus from the blastopore

Question 14

A patient contracts trichinosis after eating undercooked pork. Which phylum does the causative parasite belong to, and what is a key feature of this group?

Accepted Answer

Nematoda; undergoes ecdysis (molting)

Question 15

Which of the following is a defining feature of lophophorates such as ectoprocts and brachiopods?

Accepted Answer

Presence of a lophophore, a crown of ciliated tentacles for feeding

Question 16

Which of the following best describes the feeding mechanism of rotifers?

Accepted Answer

They use a crown of cilia to draw water into the mouth and trophi to grind food

Question 17

Which of the following is true about the body cavity of pseudocoelomates?

Accepted Answer

It is partially lined with mesoderm and partially with endoderm

Question 18

Which of the following is a real-world consequence of mollusk extinction, as discussed in the study materials?

Accepted Answer

Loss of important reef builders and ecosystem engineers

Question 19

Which of the following best explains why changes in Hox gene expression are significant in arthropod evolution?

Accepted Answer

They account for the diversity of body plans and appendage specialization

Animal Diversity and Body Plans: Structure, Function, and Evolution

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