Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 47.3, Problem 1R
Summary Introduction
To review:
The reason behind molting being a general phenomenon in arthropods and not in vertebrates.
Introduction:
Molting is the process, by which the animal sheds its part of a body, usually the outer layer. It is a very common practice in sea animals like soft-shelled crabs and all arthropods. The arthropods contain exoskeleton; hence, their growth is accommodated by molting.
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Nematode worms and annelid worms share which of the following features?
presence of a circulatory system
molting
absence of species with parasitic lifestyles
presence of segmentation
a digestive tract with two openings (a mouth and an anus)
In Hydrozoans such as the Obelia pictured above, what do gastrozooids and
gonozooids have in common, and what are their respective functions?
They are both medusae; gastrozooids produce polyps via budding, and gonozooids filter
particles from the water to feed
They are both polyps: gastrozooids filter particles from the water to feed, and gonozooids
produce reproductive medusac via budding
They are both medusae: gastrozooids filter particles from the water to feed, and gonozooids
produce polyps asexually via budding
They are both polyps; gastrozooids filter particles from the water to feed, and gonozooids
produce additional polyps via asexual budding
Explain functions of each of the following in earthworms: pharynx, calciferous glands, crop, gizzard, typhlosole, chloragogen tissue
Chapter 47 Solutions
Life: The Science of Biology
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- a) What is the unique characteristic of the prawn? b) State the organ that helps prawn swim. c) What is the process of shedding of chitinous covering by arthropods during growth? d) Why barnacles are classified under crustacean phylum? e) Crustaceans have hard, jointed external skeleton, called anarrow_forwardIn what species of marine mammals would you expect to find a gallbladder?arrow_forwardHow does segmentation and having a fluid-filled body cavity confer certain advantages to annelids over the other worm phyla such as flatworms and nematodes?arrow_forward
- What part of the earthworm's digestive system would you see in a cross-section anterior to the gizzard? the gut the sperm receptacles the crop the pharynx the oral cavityarrow_forwardThe “heart” of arthropods is located (ventrally/centrally/dorsally/sagitally)?arrow_forwardWhat is the advantage to the segmentation that is exemplified in the Phylum Annelida? Check all that apply. A)The annelid may still survive if one segment is damaged. B)Segments can be specialized. C)The importance of segmentation is unclear. D)Vital structures are repeated in each segment. E)Locomotion is more efficient.arrow_forward
- Digestion in Cnidarians is extracellular and intracellular. Is the statement correct?Explainarrow_forwardWhat is the feeding mode or mechanism in the following organisms: 1.Sea cucumber 2.Moon snails 3.Predatory polychaete wormsarrow_forwardWhat modification do sea anemones possess that allows food and water to be distributed among the partitioned regions of their bodies?arrow_forward
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