1What are the main criteria for classification of animals?
Level of organisation, symmetry, coelom, segmentation and notochord.
2Name the phylum with cellular level of organisation
Porifera.
3Which phylum shows tissue level of organisation?
Cnidaria.
4Which phylum first shows organ system level of organisation?
Annelida.
5What type of symmetry is found in Porifera?
Asymmetry.
6Name the phyla showing radial symmetry
Cnidaria and adult Echinodermata.
7Which phylum shows bilateral symmetry for the first time?
Platyhelminthes.
8What are diploblastic animals?
Animals having two germ layers.
9Name a diploblastic phylum
Cnidaria.
10What are triploblastic animals?
Animals having three germ layers.
11Name the first triploblastic phylum
Platyhelminthes.
12Define coelom
Coelom is a fluid-filled body cavity between body wall and gut.
13Which phylum is acoelomate?
Platyhelminthes.
14Which phylum is pseudocoelomate?
Aschelminthes.
15Which phylum first shows true coelom?
Annelida.
16What is metameric segmentation?
Division of body into repeated segments.
17Which phylum shows true metamerism?
Annelida.
18Which phylum has jointed appendages?
Arthropoda.
19Why is Arthropoda the largest phylum?
Due to adaptability, exoskeleton and jointed appendages.
20Name the respiratory pigment of Arthropoda
Haemocyanin.
21What is unique feature of Mollusca?
Presence of mantle and shell.
22What is radula?
A rasping organ for feeding in Mollusca.
23Name the system used for locomotion in Echinodermata
Water vascular system.
24Why are echinoderms called spiny skinned animals?
Because of calcareous spines on body surface.
25Which phylum is exclusively marine?
Echinodermata.
26Define notochord
Notochord is a rod-like structure present on dorsal side.
27Name the phylum having notochord
Chordata.
28List the basic chordate features
Notochord, dorsal hollow nerve cord, pharyngeal slits and post-anal tail.
29Name the three subphyla of Chordata
Urochordata, Cephalochordata and Vertebrata.
30In which group is notochord present only in larval stage?
Urochordata.
31In which group does notochord persist throughout life?
Cephalochordata.
32What replaces notochord in vertebrates?
Vertebral column.
33Name the superclass of Vertebrata
Pisces, Amphibia, Reptilia, Aves and Mammalia.
34What is the major difference between chordates and non-chordates?
Presence of notochord.