Animal classification Knowledge-Based Download PDF

Questions

1. 1.

   An organism that exhibits bilateral symmetry, develops from three embryonic germ layers, and possesses an acoelomate body plan lacking an internal fluid-filled cavity between the digestive tract and outer body wall belongs to which animal phylum?

   • A) Platyhelminthes
   • B) Nematoda
   • C) Annelida
   • D) Arthropoda
2. 2.

   Which of the following animal phyla is characterized by a unique water vascular system, an endoskeleton of calcareous plates, and pentaradial symmetry in adult organisms?

   • A) Arthropoda
   • B) Annelida
   • C) Nematoda
   • D) Echinodermata
3. 3.

   Which of the following animal phyla is characterized by radial symmetry, a diploblastic body plan, and specialized stinging cells called cnidocytes?

   • A) Porifera
   • B) Cnidaria
   • C) Platyhelminthes
   • D) Annelida
4. 4.

   Which of the following animal phyla is characterized by the presence of a muscular foot, a visceral mass, and a mantle that often secretes a protective shell?

   • A) Arthropoda
   • B) Annelida
   • C) Mollusca
   • D) Echinodermata
5. 5.

   Which of the following characteristics is a defining feature present in all chordates at some stage of their development?

   • A) An external chitinous exoskeleton that is periodically molted
   • B) A solid ventral nerve cord with paired segmental ganglia
   • C) Pentaradial symmetry supported by a water vascular system
   • D) A notochord and a dorsal hollow nerve cord