TAMU Biology 112 Exam (Actual 2025/2026) | Verified Questions & Correct Answers

TAMU BIOLOGY 112 (ACTUAL 2025/2026) EXAM QUESTIONS
AND VERIFIED CORRECT ANSWERS




Which of the following are NOT found in sponges?


a) Cnidocytes


b) Spicules


c) Amoebocytes


d) Spongocoela


e) Choanocytes - ----Answers ----- Cnidocytes


Which class of the phylum Cnidaria occurs ONLY as a
medusa?


a) Hydrozoa


b) Scyphozoa


c) Anthozoa

,d) Only A and C are correct


e) Only A and B are correct - ----Answers ---- Scyphozoa


A land snail, a clam, and an octopus all share


a) A mantle


b) A radula


c) Gills


d) Embryonic torsion


e) Distinct Cephalization - ----Answers------A mantle


A pearl results from calcium carbonate layers being layed
down around a foreign particle. These layers of calcium
carbonate are produced by


a) The mesoderm


b) The cnidocyte


c) The endoderm

,d) The mantle


e) The visceral mass - ----Answers------The mantle


A jointed exoskeleton is the most striking characteristic of
phylum


a) Annelida


b) Nematoda


c) Porifera


d) Molluska


e) Arthropoda - ----Answers ----- Arthropoda


An arthropod has all the following characteristics except


a) protostome development


b) bilateral symmetry

, c) pseudocoelom


d) 3 embryonic germ layers


e) true tissue - ----Answers ----- pseudocoelom


starfish, sea lilies, feather stars, sea urchins, sea
cucumbers, and sand dollars all belong to what phylum


a) Nematoda


b) Mollusca


c) Allelida


d) Echinodermata


e) Arthropoda - ----Answers ----- Echinodermata


Which of these animals has a gastrovascular cavity?


a) birds


b) hydra