LIFE SCIENCE

Detailed explanation-1: -Answer: The ‘structures of a fish’ is homologous with the ‘lung of a frog’ is the Swim bladder .

Detailed explanation-2: -Gills consist of plate-like structures called filaments that are covered by an array of lamellae enclosing a capillary blood network, as shown in Fig. 1 (1, 2). Oxygen-rich water passes through the narrow channels formed by the lamellar layers, where oxygen diffuses into the capillaries.

Detailed explanation-3: -Analogous organs have different origin and basic structure but perform the same function. Examples: Wings of insects and bats are structurally different but perform the same function of flying. Gills of fishes and lungs of rabbits differ in the basic structure but both play a role in breathing.

Detailed explanation-4: -Gills are similar to lungs in that they have branches that split. Gill arches branch to form gill filaments. On the gill filaments are gill lamellae, which is where gas exchange occurs. Here oxygen dissolved in water diffuses into the blood and carbon dioxide diffuses into the water.

Detailed explanation-5: -Like us, fish also need to take in oxygen and expel carbon dioxide in order to survive. But instead of lungs, they use gills. Gills are branching organs located on the side of fish heads that have many, many small blood vessels called capillaries.