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