EBK BIOLOGY
4th Edition
ISBN: 8220102797376
Author: BROOKER
Publisher: YUZU
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Chapter 32, Problem 7TY
Summary Introduction
Introduction: The embryo becomes a multicellular embryo by a process called cleavage during the early stage of embryonic development. Rapid cell divisions produce a hollow sphere of cells called a blastula. The growing embryo then develops different layers of cells called germ layers.
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You 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)
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Chapter 32 Solutions
EBK BIOLOGY
Ch. 32.2 - What shored derived character is common to the...Ch. 32.2 - Prob. 1CCCh. 32.2 - Core Skill: Connections Look back to Figure 25.8....Ch. 32.2 - Prob. 2CCCh. 32.3 - Prob. 1BCCh. 32.3 - Prob. 1CCCh. 32.3 - Prob. 1EQCh. 32.3 - Prob. 2EQCh. 32.3 - Prob. 3EQCh. 32 - Prob. 1TY
Ch. 32 - Prob. 2TYCh. 32 - Prob. 3TYCh. 32 - In triploblastic animals, the inner lining of the...Ch. 32 - Prob. 5TYCh. 32 - Prob. 6TYCh. 32 - Prob. 7TYCh. 32 - Naturally occurring identical twins are possible...Ch. 32 - Prob. 9TYCh. 32 - A major finding of recent molecular studies is...Ch. 32 - Prob. 1CQCh. 32 - Why was the evolution of a coelom important?Ch. 32 - Prob. 3CQCh. 32 - Discuss the many ways that animals can affect...Ch. 32 - Prob. 2COQ
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- Which of the following would be found in a sea urchin (phylum Echinodermata)? A. A dorsal hollow nerve cord B. An endoskeleton C. Schizocoelus coelom formation D. A trochophore larva E. All of the abovearrow_forwardAnnelids have (a): a. pseudocoelom. b. true coelom. c. no coelom. d. none of the abovearrow_forwardUnlike other coelomate animal phyla, mollusks lacka. segmentation.b. cephalization.c. three primary tissue layers.d. some type of body cavity.arrow_forward
- Torsion is a unique characteristic of the a. bivalves. b. gastropods. c. chitons. d. cephalopods.arrow_forwardWhich of the following is a defining trait found in chordate embryos? a. limb buds b. a coelom c. a pseudocoelom d. gill slits e. a larval stagearrow_forwardProtostomes and deuterostomes can be classified based ona. cleavage pattern.b. destiny of the blastopore.c. whether the fate of the embryonic cells is fixed early duringdevelopment.d. all of the above.arrow_forward
- 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 cnidariansarrow_forwardBivalves, cephalopods, and gastropods are alla. arthropods.b. lophophorans.c. cnidarians.d. annelids.e. molluscs.arrow_forward1. Which of the following justifies the expansion of the allantois in shelled amniotes? * a. It stores excretory wastes of the embryo. b. It can be accommodated by the coelom. c. It forms allantoic vessels for gas exchange. d. It protects the embryo from mechanical stress.2. Which frog blastula region contains the materials for the presumptive notochord? * a. deep zone b. animal cap c. vegetal base d. involuting marginal zone 3. The process of activation during fertilization is triggered by which activity? * a. the binding of the sperm to ZP3. b. the binding of the sperm to ZP2. c. the binding of the sperm to PIP2. d. the opening of calcium channels.arrow_forward
- Which of the following animals or groups of animals could possess ctenoid scales? A. Hagfish (Myxine Kuoi) B. Great Hammerhead shark (Sphyrna mokarran) C. A member of the class Actinopterygii D. B or C only E. None of the abovearrow_forwardA blastopore... A. Is the opening through which food enters a gastrovascular cavity B. Is an opening to the water-filled central cavity of a sponge C. Is the opening to the primitive gut that gives rise to the mouth in a deuterostome eucoelomate D. Is the open end of the archenteron that appears during gastrulation E. None of the abovearrow_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
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