Question

Fishes respire with lungs
A. True
B. False

Answer 1

Hint: Gill bearing aquatic craniate animals which do not possess limbs with digits are called fish. They were first classified as soft body chordates.

Complete answer: Fishes are craniate aquatic animals. They possess gills and lack limbs with digits. Various types of fishes are bony fish, cartilaginous fish, lampreys and hagfish. The external body of the fish is covered by a small rigid plate called fish scale. These scales grow out of the skin of the fishes. They are smooth and form a protective layer on the external body of fishes. They also provide effective camouflage through the use of colouration and reflection. Fishes possess operculum for the process of respiration. It consists of four bone segments named preoperculum, sub operculum, interoperculum and operculum. The operculum is a structure which consists of a series of bones. It acts as a facial support structure in the organism and also provides protection as a covering layer. The operculum is mostly found in bony fishes. The oxygen-rich water is taken into their body through the mouth and is pumped over the gills. blood inside the capillary network picks up the dissolved oxygen as the water passes over the gill filaments. Thus, the oxygen is transported to all parts of the body and into the cell through the circulatory system. Hence, the gills present in fishes regulate the function of respiration.
So, option B is the correct answer.

Note: Gills are placed on either side of the pharynx region in the fish. Thread-like structures called gill filaments are responsible for respiration in fishes. Some fishes like lampreys and sharks have multiple gill openings which are covered with an operculum. Operculum also regulates the function of respiration and feeding.