Animal Kingdom
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1
What is the basis of classification of animals?
Animals are classified based on level of organisation, symmetry, coelom, segmentation and presence of notochord.
2
What is level of organisation?
Level of organisation refers to cellular, tissue, organ and organ system organisation.
3
Which animals show cellular level of organisation?
Porifera show cellular level of organisation.
4
Which animals show tissue level of organisation?
Cnidaria show tissue level of organisation.
5
Which animals show organ level of organisation?
Platyhelminthes show organ level of organisation.
6
Which animals show organ system level of organisation?
Annelida, Arthropoda, Mollusca, Echinodermata and Chordata show organ system level.
7
What is symmetry?
Symmetry refers to the arrangement of body parts around a central axis.
8
What is asymmetry?
Asymmetry is absence of symmetry as seen in sponges.
9
What is radial symmetry?
Radial symmetry is when body parts are arranged around a central axis.
10
What is bilateral symmetry?
Bilateral symmetry is when body can be divided into two equal halves.
11
What is diploblastic organisation?
Diploblastic animals have two germ layers.
12
What is triploblastic organisation?
Triploblastic animals have three germ layers.
13
What is coelom?
Coelom is a fluid-filled body cavity between body wall and gut.
14
What are acoelomates?
Acoelomates are animals without coelom.
15
What are pseudocoelomates?
Pseudocoelomates have false body cavity.
16
What are coelomates?
Coelomates have true coelom.
17
What is segmentation?
Segmentation is division of body into repeated segments.
18
Which animals show metameric segmentation?
Annelids show metameric segmentation.
19
What is notochord?
Notochord is a rod-like structure present in chordates.
20
What are chordates?
Chordates are animals having notochord, dorsal nerve cord and pharyngeal slits.
21
What are non-chordates?
Non-chordates are animals lacking notochord.
22
What are the major non-chordate phyla?
Porifera, Cnidaria, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca and Echinodermata.
23
What are the characteristics of Porifera?
Porifera have porous body and canal system.
24
What are the characteristics of Cnidaria?
Cnidaria have cnidoblasts and radial symmetry.
25
What are the characteristics of Ctenophora?
Ctenophora show comb plates and bioluminescence.
26
What are the characteristics of Platyhelminthes?
Platyhelminthes are dorsoventrally flattened.
27
What are the characteristics of Aschelminthes?
Aschelminthes are pseudocoelomates with cylindrical body.
28
What are the characteristics of Annelida?
Annelids show metameric segmentation and true coelom.
29
What are the characteristics of Arthropoda?
Arthropods have jointed appendages and exoskeleton.
30
What are the characteristics of Mollusca?
Molluscs have soft body with mantle and shell.
31
What are the characteristics of Echinodermata?
Echinoderms have spiny skin and water vascular system.
32
What is the position of Echinodermata?
Echinoderms are marine animals with radial symmetry in adults.
33
What are hemichordates?
Hemichordates show characters of both chordates and non-chordates.
34
What are chordates divided into?
Chordates are divided into Urochordata, Cephalochordata and Vertebrata.
35
What is Urochordata?
Urochordates have notochord only in larval stage.
36
What is Cephalochordata?
Cephalochordates have notochord throughout life.
37
What is Vertebrata?
Vertebrates have vertebral column replacing notochord.
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