Short Answer TypeWhat are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
Long Answer TypeHow useful is the study of the nature of body cavity and coelom in the classification of animals?
Short Answer TypeWhat are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
Multiple Choice QuestionsWater vascular system is the characteristic of which group of the following:
Porifera
Ctenophora
Echinodermata
Chordata
Short Answer Type“All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.
Chordates are those animals which have a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. Chordates are sub classified into four other groups of which vertebrate is one subphyla.
However, Vertebrates are characterized by the presence of the notochord in the embryonic stage, which gets replaced by a cartilaginous or bony vertebral column in adults.
Since the notochord is not replaced by the vertebral column in all the chordates, thus, it can be said that all vertebrates are chordates but all chordates are not vertebrates.
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