First slide

Classification of Animals

Question

Which of the following is common feature of Ascidia, Pristis, Hyla and Calotes?

Easy

A

Cartilaginous or bony vertebral column.
B

Solid, dorsal and double nerve cord.
C

Three chambered heart with closed circulatory system
D

Paired pharyngeal gill slits at least in embryonic stage

Solution

Ascidia (Urochordata), Pristis (Pisces), Hyla (Amphibia), Calotes (Reptilia) are all chordates with pharyngeal slits at least in the embryonic stage.
Dorsal nerve cord is single and hollow in chordates.
Heart is 2-4 chambered in different classes of phylum Chordata.
Notochord is present only in the larval tail in Ascidia.

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