Animal classification Knowledge-Based Practice

Questions

1. 1.

   Which of the following characteristics distinguishes sponges (phylum Porifera) from all other major animal phyla?

   • A) Absence of true tissues organized from embryonic germ layers
   • B) Absence of bilateral body symmetry
   • C) Presence of an incomplete digestive cavity with a single opening
   • D) Inability to produce flagellated gametes during sexual reproduction
2. 2.

   During embryonic development in bilaterally symmetrical animals, which of the following characteristics distinguishes deuterostomes from protostomes?

   • A) Development of the mouth directly from the blastopore
   • B) Spiral and determinate cleavage during early cell division
   • C) Formation of the anus from or near the initial blastopore opening
   • D) Formation of the coelom by splitting of solid mesodermal tissue masses
3. 3.

   Which of the following animal phyla is characterized by a pseudocoelom, in which the fluid-filled body cavity is only partially lined by tissue derived from mesoderm?

   • A) Platyhelminthes
   • B) Annelida
   • C) Nematoda
   • D) Echinodermata
4. 4.

   Which of the following diagnostic features is uniquely found in members of the phylum Echinodermata?

   • A) Jointed appendages and a chitinous exoskeleton
   • B) A water vascular system operating tube feet
   • C) A rasping tongue-like structure termed a radula
   • D) Specialized stinging cells known as cnidocytes
5. 5.

   Which of the following characteristics uniquely distinguishes mammals from all other extant vertebrate classes?

   • A) Hair and mammary glands
   • B) A four-chambered heart and endothermy
   • C) Amniotic eggs and pulmonary respiration
   • D) Bilateral symmetry and internal fertilization

Answers and step-by-step solutions appear after you finish the test.