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NEET Biology question

BiologyAnimal KingdomNEET

Which of the following is/are NOT the characteristic(s) of the Class Osteichthyes?

(i) Body is streamlined and mouth is terminal. (ii) Gills are covered by operculum. (iii) Skin covered with cycloid and placoid scales. (iv) Many of them are viviparous.

Answer: (B)

Solution

A streamlined body with a terminal mouth and gills covered by an operculum are genuine characteristics of Osteichthyes, so statements (i) and (ii) ARE characteristic. However, the skin of Osteichthyes bears cycloid or ctenoid scales, not placoid scales (placoid scales are

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Question ID VK-106853