In which one of the following, the genus name and its two characters are not correctly matched?
Organism Characters
1. Ascidia (i) Pharyngeal gill-slits
(ii) Retrogressive metamorphosis
2. Labeo (i) Operculum
(ii) Placoid scales
3. Petromyzon (i) Ectoparasite on fishes
(ii) Closed circulatory system
4. Alligator (i) Scutes over the body
(ii) Four-chambered heart

Easy

Solution

Labeo is a bony fish and thus lacks placoid scales. Placoid scales are characteristically present in the cartilaginous fishes.

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	Organism	Characters
1.	Ascidia	(i) Pharyngeal gill-slits (ii) Retrogressive metamorphosis
2.	Labeo	(i) Operculum (ii) Placoid scales
3.	Petromyzon	(i) Ectoparasite on fishes (ii) Closed circulatory system
4.	Alligator	(i) Scutes over the body (ii) Four-chambered heart