Question

The fishes have lungs for respiration.
A. True
B. False

Answer 1

Hint: Respiration is a mechanism in which animals exchange gasses between their body cells and the atmosphere. Second, respiration may refer to external respiration or the method of breathing (inhalation and exhalation), also referred to as ventilation.

Complete answer: The fish take oxygen-rich water from their mouths and pipe it through their gills. When water flows into the gill filaments, blood within the capillary network takes up dissolved oxygen. The circulatory system then carries oxygen to all body tissues and eventually to the cells. Thus the fishes breathe through the gills. The lungs are absent in fishes. With the exception of certain marine species, filaments and lamellae contain blood or coelomic fluid from which gasses are exchanged across thin walls. Blood delivers oxygen to the remainder of the body. Carbon dioxide flows into the thin gill tissue of the blood into the water. Gills or gill-like organs, situated in various areas of the body, are present in different classes of marine organisms, including molluscs, crustaceans, insects, fish and amphibians. Semi terrestrial aquatic creatures, such as crabs and mudskippers, have gill chambers in which they retain water, allowing them to use dissolved oxygen while they are onshore.
Hence, the correct answer is option B.

Note: Gills typically consist of thin filaments of tissue, lamellae (plates), roots, or thin, tufted processes that have a strongly folded surface to increase the surface area. The fragile existence of the gills is possible because of the protection offered by the surrounding water. For ease of absorption, the blood or other body fluid must be intimately in contact with the respiratory surface.