Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 31, Problem 4TYK
Summary Introduction
Introduction:
Cnidaria and Ctenophora, the two phyla of soft-bodied organisms, are radially symmetrical (the parts of their body are arranged regularly around the central axis, like the spokes of a wheel) and lack organ systems and coelom. The phylum, Cnidaria (knife: stinging nettle) has nearly nine thousand species. Cnidarians have unique cells in their epidermis called cnidocytes, which is armed with a stinging nematocyst.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
How do body structures and functions of a flatworm compare with those of a cnidarian for
a. sensory responses to the environment?
b. arrangement of the nervous system?
c. obtaining food?
d. movement?
e. excretion of body wastes?
In which of the following aspects are nematodes more complex than flatworms?
a. External cephalization
b. None among the other choices
c. Musculature of the body wall
d. All of the other choices (except "None among....")
e. Osmoregulatory and excretory systems
The larval stage of a cnidarian is known as a
a. medusa.
b. planula.
c. polyp.
d. cnidocyte.
Chapter 31 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 31.1 -
1. What characteristics distinguish animals from...Ch. 31.1 - How does the ability of animals to move through...Ch. 31.2 - What is a tissue, and what three primary tissue...Ch. 31.2 - What type of body symmetry do humans have?Ch. 31.2 - What is the functional significance of the coelom?Ch. 31.2 - Prob. 4SBCh. 31.3 - Which major groupings of animals defined on the...Ch. 31.3 - Prob. 2SBCh. 31.4 - Prob. 1SBCh. 31.4 - Prob. 2SB
Ch. 31.5 - Prob. 1SBCh. 31.5 - Prob. 2SBCh. 31.5 - What do ctenophores eat, and how do they collect...Ch. 31.6 - Prob. 1SBCh. 31.6 - Prob. 2SBCh. 31.6 - Prob. 3SBCh. 31.6 - Prob. 4SBCh. 31.7 - Prob. 1SBCh. 31.7 - If an arthropods rigid exoskeleton cannot be...Ch. 31.7 - Prob. 3SBCh. 31.7 - Prob. 4SBCh. 31 - Prob. 1TYKCh. 31 - Prob. 2TYKCh. 31 - Protostomes and deuterostomes typically differ in:...Ch. 31 - Prob. 4TYKCh. 31 - Which organ system is absent in flatworms (phylum...Ch. 31 - Prob. 6TYKCh. 31 - Prob. 7TYKCh. 31 - Which body region of an insect bears the walking...Ch. 31 - Prob. 9TYKCh. 31 - What is the major morphological innovation seen in...Ch. 31 - Prob. 11TYKCh. 31 - Prob. 12TYKCh. 31 - Discuss Concepts What are the relative advantages...Ch. 31 - Prob. 14TYKCh. 31 - Prob. 15TYKCh. 31 - Prob. 16TYKCh. 31 - Prob. 1ITD
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Flatworms (platyhelminthes) possess a a. metanephridial system b. protonephridial system c. secretion kidney d. none of thesearrow_forwardWhich structure(s) occur ONLY in chordata? (check all of which are true) A. NotochordB. Dorsal hollow nerve cordC. Endostylearrow_forwardWhich of the following characteristics are unique to a ctenophore? Do not possess nematocysts; A swim by using comb plates. Possess nematocysts; swim by В using comb plates. Have adhesive cells, or C colloblasts, for capturing food. D Both a and c. Both b and c.arrow_forward
- Nematodes (roundworms) differs from an earthworm in that: O a. Nematodes have no body cavity. O b. Nematodes are all parasitic. Nematodes have no head or eyes. d. Nematodes move using leg-like projections of the body. O e. Nematodes have no circular muscles.arrow_forwardWhich 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_forwardVenom glands may be adaptations of modified ovipositors for venom injection in hymenopterans....what does this meanarrow_forward
- A“negatively phototaxic” amphipod will swim:a.away from parasitic worms.b.towards parasitic worms.c.away from competing amphipods.d.towards light.e.away from light.arrow_forwardThe 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_forwardNematodes (roundworms) differs from an earthworm in that: O a. Nematodes have no body cavity. O b. Nematodes are all parasitic. c. Nematodes have no head or eyes. O d. Nematodes move using leg-like projections of the body. O e. Nematodes have no circular muscles.arrow_forward
- Choose 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_forwardThe function of the apical complex in apicomplexans is toa. propel the cell through water.b. penetrate host tissue.c. absorb food.d. detect light.arrow_forwardWhich of the following is not a member of the phylum Chordata? a. Cephalochordata b. Echinodermata c. Urochordata d. Vertebrataarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College