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Questions and Answers
Which type of body cavity is present in pseudocoelomates?
Which type of body cavity is present in pseudocoelomates?
What is the primary structural characteristic of metamerism?
What is the primary structural characteristic of metamerism?
Which of the following groups of animals are classified as acoelomates?
Which of the following groups of animals are classified as acoelomates?
What distinguishes chordates from non-chordates?
What distinguishes chordates from non-chordates?
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In which category of symmetry do echinoderms fall during their development?
In which category of symmetry do echinoderms fall during their development?
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What type of nutrition is characteristic of organisms in the Animal Kingdom?
What type of nutrition is characteristic of organisms in the Animal Kingdom?
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Which of the following is a characteristic of the subkingdom Parazoa?
Which of the following is a characteristic of the subkingdom Parazoa?
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What type of symmetry is exhibited by organisms in the Phylum Cnidaria?
What type of symmetry is exhibited by organisms in the Phylum Cnidaria?
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Which level of organization is characterized by the presence of only cells without any tissue or organ formations?
Which level of organization is characterized by the presence of only cells without any tissue or organ formations?
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Which group of animals is characterized by having a coelom?
Which group of animals is characterized by having a coelom?
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Diploblastic animals are characterized by having how many germ layers during their embryonic development?
Diploblastic animals are characterized by having how many germ layers during their embryonic development?
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Which phylum is characterized by an organ grade of organization?
Which phylum is characterized by an organ grade of organization?
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What type of body symmetry do coelenterates exhibit?
What type of body symmetry do coelenterates exhibit?
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Which layer is not present in diploblastic animals?
Which layer is not present in diploblastic animals?
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What is a defining feature of bilaterally symmetrical organisms?
What is a defining feature of bilaterally symmetrical organisms?
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Which group of animals does not exhibit organ-level organization?
Which group of animals does not exhibit organ-level organization?
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Which subkingdom includes organisms with true organ systems?
Which subkingdom includes organisms with true organ systems?
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In which type of cellular organization are tissues formed from cells performing the same function?
In which type of cellular organization are tissues formed from cells performing the same function?
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Which of the following animals are considered eucoelomates?
Which of the following animals are considered eucoelomates?
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What is the main distinction between diploblastic and triploblastic animals?
What is the main distinction between diploblastic and triploblastic animals?
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Which of the following statements about the coelom is incorrect?
Which of the following statements about the coelom is incorrect?
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Study Notes
Animal Kingdom
- Kingdom Animalia includes all multicellular organisms.
- All animals are heterotrophic and depend on others for nutrition.
- All animals undergo locomotion.
- All animals reproduce.
Subkingdom Parazoa
- Characterized by cellular aggregation.
- Has no true tissues or organs.
- Includes the Phylum Porifera (sponges).
Subkingdom Eumetazoans
- Characterized by possessing true organ systems.
- Includes 10 Phyla:
- Coelentrata / Cnidaria
- Ctenophora
- Platyhelminthes
- Aschelminthes / Nematoda / Nemathelminthes
- Annelida
- Arthropoda
- Mollusca
- Echinodermata
- Hemichordata
- Chordata
Basis of Classification
Level of Organisation
- Cellular level: Only cells are present. (Eg. Porifera)
- Tissue level: Group of similar cells form tissues. (Eg. Coelentrata, Ctenophora)
- Organ level: Tissues are organised into organs. (Eg. Platyhelminthes)
- Organ System level: Organs are organised into organ systems. (Eg. Aschelminthes upto Chordata)
Symmetry
- Asymmetrical: No plane can divide body into equal halves. (Eg. Porifera)
- Radially symmetrical: Body can be divided into equal halves by multiple planes passing through the central axis. (Eg. Coelentrata, Ctenophora, Echinoderm ADULT)
- Bilaterally symmetrical: Body can be divided into equal halves by passing a single plane through the central axis (Eg. Platyhelminthes upto Chordata (Echinoderm LARVA) )
Germ Layer
- Diploblastic Animals: Two germ layers: Ectoderm and Endoderm. (Eg. Coelentrata, Ctenophora)
- Triploblastic Animals: Three germ layers: Ectoderm, Mesoderm, and Endoderm. (Eg. Platyhelminthes upto Chordate)
Coelom
- Coelom: Body cavity lined by mesoderm on both sides. (Eucoelomate)
- Pseudocoelom: Body cavity not lined by mesoderm, mesoderm forms pouches in between ectoderm and endoderm. (Pseudocoelomate)
- Acoelomate: Body cavity is absent. (Acoelomate)
Segmentation
- Metameric Segmentation: Body is divided into repeated segments with serial repetition of organs. (Eg. Earthworm)
Notochord
- Notochord: A rod-like structure formed on the dorsal side of the embryo in some animals.
- Chordates: Animals with notochord.
- Non-Chordates: Animals without notochord.
Classification of Animals
- Phylum Porifera: Cellular level of organisation, asymmetrical, acoelomates, no distinct tissues or organs.
- Phylum Coelenterata (Cnidaria): Tissue level of organisation, radially symmetrical, acoelomates.
- Phylum Ctenophora: Tissue level of organisation, radially symmetrical, acoelomates.
- Phylum Platyhelminthes: Organ level of organisation, bilaterally symmetrical, acoelomates.
- Phylum Aschelminthes: Organ-system level of organisation, bilaterally symmetrical, pseudocoelomates.
- Phylum Annelida: Organ-system level of organisation, bilaterally symmetrical, coelomates, shows metameric segmentation.
- Phylum Arthropoda: Organ-system level of organisation, bilaterally symmetrical, coelomates, shows metameric segmentation.
- Phylum Mollusca: Organ-system level of organisation, bilaterally symmetrical, coelomates.
- Phylum Echinodermata: Organ-system level of organisation, mostly radially symmetrical in adult, bilaterally symmetrical in larval stage, coelomates.
- Phylum Hemichordata: Organ-system level of organisation, bilaterally symmetrical, coelomates.
- Phylum Chordata: Organ-system level of organisation, bilaterally symmetrical, coelomates, possesses notochord.
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Description
Test your knowledge about the Animal Kingdom and its classification. This quiz covers the main features of Kingdom Animalia, along with the subkingdoms Parazoa and Eumetazoans, and their organizational levels. Challenge yourself and discover how much you know about multicellular organisms and their classifications.
