Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 33, Problem 4TY
In triploblastic animals, the inner lining of the digestive tract is derived from the
- a. ectoderm.
- b. mesoderm.
- c. endoderm.
- d. pseudocoelom.
- e. coelom.
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The epitheliomuscular cells found in cnidarians anticipate the muscular system of more complex
animals. The absence of muscle tissue in cnidarians primarily reflects...
A. The fact that cnidarians are basal metazoans, having specialised cells but lacking tissues
B. The presence of only two germ layers, ectoderm and endoderm, in cnidarian embryos
C. The fact that cnidarians lack a nervous system
D. The sessile lifestyle observed in all cnidarians
E. All of the above explain the absence of muscle tissue in cnidarians
Observation of the development of embryos in sea stars shows the mesoderm forming pouches bulging from the archenteron to form the coelom. From this observation, you can predict that
A.
the cleavage of the embryo is radial.
B.
the adult animal will have bilateral symmetry.
C.
the mouth forms from the first opening in the gastrula.
D.
the animal is diploblastic.
Unlike other coelomate animal phyla, mollusks lacka. segmentation.b. cephalization.c. three primary tissue layers.d. some type of body cavity.
Chapter 33 Solutions
Biology
Ch. 33.2 - Core Skill: Connections Look back to Figure 25.8....Ch. 33.2 - Prob. 2CSCh. 33.3 - Prob. 1CSCh. 33.3 - Prob. 1EQCh. 33.3 - Prob. 2EQCh. 33.3 - Prob. 3EQCh. 33 - Prob. 1TYCh. 33 - Prob. 2TYCh. 33 - Prob. 3TYCh. 33 - In triploblastic animals, the inner lining of the...
Ch. 33 - Prob. 5TYCh. 33 - Prob. 6TYCh. 33 - Prob. 7TYCh. 33 - Naturally occurring identical twins are possible...Ch. 33 - Prob. 9TYCh. 33 - A major finding of recent molecular studies is...Ch. 33 - Fierce debate centers on whether ctenophores or...Ch. 33 - Why was the evolution of a coelom important?Ch. 33 - Prob. 3CQCh. 33 - Discuss the many ways that animals can affect...Ch. 33 - Prob. 2COQ
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- Segmentation, first seen in annelids, allows evolutionary advantages bya. allowing more fluid movement for less energy expense.b. specialization of segments to carry out different functions.c. allowing coelom development.d. concentrating sensory and nervous tissues and organs in the direction of motion.arrow_forwardThe coelom a. is a synapomorphy for the clade comprising protostomes and deuterostomes. b. evolved multiple times convergently. c. is always an indicator of close evolutionary relationship. d. forms within the endoderm.arrow_forwardThe larval stage of a cnidarian is known as a a. medusa. b. planula. c. polyp. d. cnidocyte.arrow_forward
- A member of the protostome group of animals a. has no symmetry. b. has an anus derived from the blastopore. c. has a mouth derived from the blastopore. d. has a mouth derived from the primitive groove.arrow_forwardWhich of the following is the correct order for the four developmental phases in animals? A. Segmentation of the body B. Determination C. Cell differentiation D. Formation of body axes a. A, B, C, D b. A, D, C, B c. D, A, B, C d. D, A, C, Barrow_forwardChoose which is FALSE among the following statements about the anatomy of annelids. A. Earthworms have mouth, teeth, pharynx, crop, gizzard, intestines, and anus. B. Species of leeches have either jaws and teeth or proboscis as mechanisms for bloodsucking. C. Leeches have anterior and posterior suckers, being the later as used for attachment only. D. The cirri is for sensory, while the parapodia is for respiration and locomotion. E. Leeches have a fixed number of metameres of 33-34 Choose which is FALSE among the following statements about the reproduction of annelids. A. Fertilization in leeches is internal, while in the oligochaetes is external. B. The seminal receptacles of each earthworm receive the sperm during copulation. C. Clitellum is visible in leeches only during the reproductive period, while absent in the juvenile stage of earthworms. D. Cocoons are produced by the ovaries to house the developing eggs. E. Organisms of…arrow_forward
- During embryonic development, a neural crest would be found in all of the following chordates, except a. cephalochordates. b. reptiles. c. birds. d. mammals.arrow_forwardWhich of the following applies to a squid? a. Cephalization c. Complete digestive tract b. True coelom d. All of these are correct.arrow_forwardYou find a flatworm during a field trip and discover that the embryos undergo spiral cleavage. What also must be true of this animal? (can be more than one anwser) E. regulative development B. mosaic development C. it is acoelomate D. All of these A. bilateral symmetryarrow_forward
- A deuterostome has what type of cleavage Group of answer choices A. spiral, indeterminate at 8 cells B, radial, indeterminate at 8 cells C. spiral, determinate at 8 cells D. radial, determinate at 8 cellsarrow_forwardA psydocoelomate refers to an animal with a A. functional body cavity lined by tissues derived from mesoderm and endoderm. B. functional body cavity lined by tissues derived only from endoderm. C. functional body cavity lined by tissues derived only from mesoderm. D. body cavity that does not function properlyarrow_forwardWhich of the following statements about bilaterian animals is false? A. Many bilaterians are invertebrates but some are not. B. All bilaterians are triploblastic (have three germ layers). C. All bilaterians have bilateral symmetry. D. Most bilaterians have tissues but some do not.arrow_forward
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