The protective covering on the gills are known as

Operculum

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Gills

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Spiracles

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All of the above

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Solution

The correct option is A Operculum
Gills are the respiratory organs of the fishes. It helps in gaseous exchange by absorbing the dissolved oxygen in water. The gills are covered by a bony covering which is known as operculum. It is used for respiration and feeding. Gills have gills lamellae through which the blood flows opposite direction to the water. The dissolved oxygen from the water diffuses into the blood capillaries.
So, the correct answer is option A.

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