In which one of the following, the genus name and its two characters are correctly matched?
Organism Character 1 Character 2
1 Ascidia Vertebral column Pharyngeal gill slits
2 Torpedo Electric organs Placoid scales
3 Catla Air bladder Tympanum
4 Crocodylus Scutes over body Three-chambered heart

Moderate

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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