Animal Classification Quiz

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Questions and Answers

What is the main characteristic that distinguishes coelomates from acoelomates?

  • Presence of scattered mesodermal pouches
  • Presence of a notochord
  • Presence of segmented bodies
  • Presence of a body cavity lined with mesoderm (correct)

Which type of animal possesses a pseudocoelom?

  • Annelids
  • Aschelminthes (correct)
  • Molluscs
  • Platyhelminthes

What is the term for animals that display external and internal body segmentation?

  • Pseudocoelomates
  • Coelomates
  • Non-segmented animals
  • Metameric segmentation (correct)

Which group of animals is defined by the presence of a notochord during development?

<p>Chordates (B)</p> Signup and view all the answers

Which of the following is an example of an acoelomate?

<p>Platyhelminthes (D)</p> Signup and view all the answers

What defines a coelomate animal?

<p>Body cavity lined by mesoderm (D)</p> Signup and view all the answers

Which of the following is NOT an example of a coelomate?

<p>Planarians (D)</p> Signup and view all the answers

Which type of body cavity characterizes pseudocoelomates?

<p>Scattered pouches of mesoderm between ectoderm and endoderm (C)</p> Signup and view all the answers

What is the primary characteristic of acoelomates?

<p>Absence of any body cavity (D)</p> Signup and view all the answers

Which animal is a classic example of segmentation observed in coelomates?

<p>Earthworm (B)</p> Signup and view all the answers

What is the primary function of the water transport system in sponges?

<p>For food gathering, respiratory exchange and waste removal (B)</p> Signup and view all the answers

Which statement about sponges is correct?

<p>Sponges are hermaphroditic, possessing both eggs and sperms. (D)</p> Signup and view all the answers

What type of cells line the spongocoel and canals in sponges?

<p>Choanocytes (A)</p> Signup and view all the answers

What distinguishes the larval stage of sponges from the adult form?

<p>It is morphologically distinct from the adult. (B)</p> Signup and view all the answers

What materials typically make up the skeleton of sponges?

<p>Spicules or spongin fibers (C)</p> Signup and view all the answers

What unique structures do Cnidaria possess that allow them to capture prey?

<p>Cnidoblasts (B)</p> Signup and view all the answers

Which body form in Coelenterata is characterized as sessile and cylindrical?

<p>Polyp (A)</p> Signup and view all the answers

How do Cnidaria primarily reproduce in their polyp form?

<p>Budding (C)</p> Signup and view all the answers

Which of the following is NOT a characteristic of Cnidaria?

<p>Exclusively freshwater (B)</p> Signup and view all the answers

What is the role of the gastrovascular cavity in Cnidaria?

<p>Digestion and circulation (C)</p> Signup and view all the answers

Flashcards

Coelom

A body cavity lined by mesoderm.

Coelomate

An animal with a coelom.

Segmentation

Repetitive body parts in animals.

Pseudocoelomate

Animals with a body cavity not completely lined by mesoderm.

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Acoelomate

Animals without a body cavity.

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Body cavity

Internal space separating the digestive tract from the body wall.

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Mesoderm

Middle germ layer in animal development.

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Coelom

A body cavity lined with mesoderm.

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Coelomate

Animals with a coelom.

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Pseudocoelomate

Animals with a pseudocoelom, not lined by mesoderm.

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Acoelomate

Animals without a body cavity.

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Metameric Segmentation

Body division into repeating segments internally and externally.

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Notochord

Dorsal rod-like structure in some animals during development.

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Chordate

Animals with a notochord.

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Non-Chordate

Animals without a notochord.

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Coelenterata (Cnidaria)

A phylum of aquatic animals, mostly marine, featuring radial symmetry and stinging cells (cnidocytes).

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Cnidoblast

A specialized stinging cell found in Coelenterata, used for defense and capturing prey.

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Polyp

Sessile, cylindrical body form in Coelenterata, attached to a surface.

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Medusa

Free-swimming, umbrella-shaped body form in Coelenterata.

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Gastrovascular cavity

A single-opening body cavity for digestion in Coelenterata.

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Alternation of generations (metagenesis)

Life cycle with both polyp and medusa stages in Coelenterata.

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Asexual reproduction (Coelenterata)

Reproduction in Coelenterata, usually by budding, in polyp phase.

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Radially symmetrical

Body parts arranged around a central axis in Coelenterata.

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Tissue level of organization (Coelenterata)

Two germ layers create specialized tissues in Coelenterata.

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Sponges (Porifera)

Primitive multicellular marine animals with a water canal system for transport, food, respiration, and waste removal.

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Water Canal System

A network of channels in sponges that facilitates water flow, bringing in food and oxygen, and carrying out waste.

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Ostia

Tiny pores in a sponge's body wall where water enters.

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Spongocoel

Central cavity in a sponge where water is channeled.

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Osculum

Opening in a sponge where water exits.

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Choanocytes

Collar cells lining the spongocoel and canals in sponges; help in food capture.

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Intracellular Digestion

Food digestion occurring inside sponge cells.

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Spicules/spongin fibers

Supporting structures in sponges made of hard spicules or flexible spongin fibres.

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Hermaphrodite

A sponge where both eggs and sperm are produced by the same individual.

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Asexual Reproduction

Sponges reproduce asexually by breaking into fragments which grow into new sponges.

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Sexual Reproduction

Sponges reproduce sexually by the formation of eggs and sperm.

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Indirect Development

Sponge development with a larval stage distinct from the adult stage.

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