Question

Go through the following flow chart for division of subphylum vertebrata. Fill the gaps A, B, C and D and select the correct option.

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A

A-Ostracodermi, B-Cyclostomata, C-Pisces, D-Tetrapoda

B

A-Cyclostomata, B-Ostracodermi, C-Pisces, D-Tetrapoda

C

A-Ostracodermi, B-Tetrapoda, C-Cyclostomata, D-Pisces

D

A-Pisces, B-Ostracodermi, C-Tetrapoda, D-Cyclostomata

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Solution

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Correct option is A)

Subphylum Vertebrata is divided Into two divisions. They are agnatha (jawless) and gnathostomata (with jaw). Agnatha are further divided into two classes-Ostracodermi, which is extinct and Cyclostomata (e.g., hag fish). Jawed vertebrates are divided into two superclasses-Pisces (true fish) and Tetrapoda (four limbs).

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