Animal Kingdom Chapter 4: Basis of Classification

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Questions and Answers

What is the level of organization of cells in sponges?

  • System level
  • Organ level
  • Cellular level (correct)
  • Tissue level

What is the main reason for the need of classification of animals?

  • To study the evolution of animals
  • To assign a systematic position to newly described species (correct)
  • To identify the differences in structures and forms
  • To group animals based on their habitat

Which feature is used as the basis of animal classification?

  • Nature of habitat
  • Arrangement of cells (correct)
  • Body size
  • Dietary habits

In which group do the cells performing the same function arrange into tissues?

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

What is the total number of described species of animals till now?

<p>Over 1 million (C)</p> Signup and view all the answers

Why are fundamental features common to various individuals used as the basis of animal classification?

<p>To assign a systematic position to newly described species (B)</p> Signup and view all the answers

Which level of organization is exhibited by members of Platyhelminthes and other higher phyla?

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

What is the term used for animals that can be divided into identical left and right halves in only one plane?

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

What type of animals have cells arranged in two embryonic layers, an external ectoderm, and an internal endoderm?

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

What is the term used for the presence or absence of a cavity between the body wall and the gut wall?

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

Which type of symmetry categorizes animals where any plane that passes through the center does not divide them into equal halves?

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

What is the term used for the animals that have a third germinal layer, mesoderm, in between the ectoderm and endoderm during development?

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

In which type of digestive system does an animal have only a single opening to the outside of the body serving as both mouth and anus?

<p>Incomplete digestive system (C)</p> Signup and view all the answers

What type of animals has organs associated to form functional systems, with each system concerned with a specific physiological function?

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

Which type of symmetry categorizes animals where any plane passing through the central axis divides the organism into two identical halves?

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

Animals with a cavity between the body wall and the gut wall lined by mesoderm are called __________.

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

Flashcards

Sponge Cell Organization

Sponges exhibit a cellular level of organization, where cells operate independently.

Why Classify Animals?

Classification helps assign a systematic position to newly discovered species.

Basis of Classification

The arrangement of cells is a fundamental basis for animal classification.

Tissues in Coelenterates

In Coelenterates, cells performing similar functions are arranged into tissues.

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Number of Animal Species

There are over 1 million described species of animals.

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Why Fundamental Features?

Fundamental features are used to assign systematic positions to newly described species.

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Organ Level Organization

Platyhelminthes and higher phyla exhibit an organ level of organization.

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Bilateral Symmetry

Bilateral symmetry means mirroring left and right halves in one plane.

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Diploblastic Animals

Diploblastic animals have two germ layers: ectoderm and endoderm.

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Acoelomate

Acoelomate refers to the absence of a body cavity.

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Asymmetry

Asymmetry means no plane divides the animal into equal halves.

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Triploblastic Animals

Triploblastic animals have three germ layers: ectoderm, mesoderm, and endoderm.

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Incomplete Digestive System

An incomplete digestive system has one opening for both mouth and anus.

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Platyhelminthes Organ Systems

Platyhelminthes have organs forming functional systems for physiological functions.

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Coelomate Animals

Coelomate animals have a body cavity lined by mesoderm.

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