Q.

In which one of the following, the genus name and its two characters are correctly matched?

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a

1

b

2

c

3

d

4

answer is B.

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Detailed Solution

Torpedo is commonly called electric ray. It has electric organs. Scales in Chondrichthyes are placoid. Ascidia is a urochordate. Notochord is present but vertebral column is absent in urochordates and cephalochordates. Tympanum is absent in fishes (e.g., Catla). Crocodiles have a four-chambered heart.
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