Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 16, Problem 2RQ
How does a molluscan coelom develop embryologically? Why was the evolutionary development of a coelom important?
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Consider the process of organogenesis.
a) Describe how coelom-status impacts the process of organogenesis.
b) How do organs develop and where (in which cavity)? When does this process occur?
What is the point of dividing the coelom into the thoracic and abdominal cavities? Why would a single cavity not function as well?
What was the evolutionary significance of segmentation and the coelom to its earliest lophotrochozoan possessors?
Chapter 16 Solutions
Loose Leaf For Integrated Principles Of Zoology
Ch. 16 - Explain how ocean acidification is likely to...Ch. 16 - How does a molluscan coelom develop...Ch. 16 - Prob. 3RQCh. 16 - Briefly describe characteristics of the...Ch. 16 - Briefly describe the habitat and habits of a...Ch. 16 - Prob. 6RQCh. 16 - Prob. 7RQCh. 16 - Prob. 8RQCh. 16 - Prob. 9RQCh. 16 - Use examples to explain how the external...
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- Does coelom present in bilateria?arrow_forwardWhat is the difference between atrium and coelom?arrow_forwardWhile sampling marine plankton in a lab, a student finds a large number of fertilized eggs. The student raises some of the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into a trochophore larva and eventually has a true coelom. These eggs probably belong to (gastropod/nematode/Platyhelminthes/ or gastropod and nematode)?arrow_forward
- Why might a parasitic protozoan lack mitochondria?arrow_forwardWhich of the following exhibits embryonic development by the protostome pathway? A) Mammals B) Sharks C) Amphibians D) Arthropoda E) Cnideria Explain whyarrow_forwardWhy is bilateral symmetry of adaptive value for actively motile animals?arrow_forward
- Worms are present in the Platyhelminthes, Annelid and Nematode lineages. How is the coelom used to differentiate among these different types of worms? Platyhelminthes exhibit a coelom only in the embryo, Annelids exhibit a coelom only in juveniles, and Nematodes exhibit a coelom in both embryos and adults. Platyhelminthes exhibit a coelom in embryos, Annelids exhibit a coelom only in juveniles and Nematodes lack a coelom. Platyhelminthes develop a coelom before the anal and oral pores develop, Annelids develop a coelom at the same time the anal and oral pores develop, and Nematodes lack a coelom. Platyhelminthes develop one coelom, Annelids develop two coelom, and Nematodes develop three coelom but then lose the one derived from mesoderm. Platyhelminthes lack a coelom, Annelids exhibit a coelom and Nematodes have a pseudocoelom.arrow_forwardClass Gastropoda and Class Bivalvia independently evolved modifications to their body plan that allowed them to invade sandy and muddy habitats, burying their bodies under the surface and accessing the surface via siphons. For an example organism in each Class, (1) draw a diagram showing the morphological modifications and (2) write a description of how this organism had evolved from the hypothetical ancestral mollusk (HAM) body plan.arrow_forwardMatch the description given with either protostome or deuterostome or neither 1)spiral cleavage 2)blastopore becomes the anus 3)schizocoelous coelom formation 4)indeterminate cleavage 5)determinate cleavage 6)blastopore becomes the primitive streak 7)radial cleavage 8)enterocoelous coelom formationarrow_forward
- What does the mesoderm have to do with the designation of a true coelom? A)The mesoderm gives rise to the fluid found within the coelom. B)The mesoderm gives rise to the floor of the coelom only C)The mesoderm has nothing to do with the coelom. D)The mesoderm gives rise to the structure of the coelom wall. E)The mesoderm gives rise to the coelom because it develops within the mesodermarrow_forwardHow is a hemocoel different from a true coelom?arrow_forwardDistinguish between (a) radial and bilateral symmetry; (b) blastula andgastrula; (c) direct and indirect development; (d) complete andincomplete digestive tracts; (e) coelom and pseudocoelom.arrow_forward
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