EVERYDAY SCIENCE

Detailed explanation-1: -The correct answer is (a) swim bladder. (a) swim bladder. Fish has a structure that is called a swim bladder, which prevents the fish from sinking.

Detailed explanation-2: -The trick is the swim bladder, which is basically like an air-inflated balloon that can expand and contract depending on how much gas is inside. When the swim bladder expands it will increase in volume and therefore displace more water. This increases the fish’s buoyancy and it will float upward.

Detailed explanation-3: -The swim bladder is a gas-filled organ in the dorsal coelomic cavity of fish. Its primary function is maintaining buoyancy, but it is also involved in respiration, sound production, and possibly perception of pressure fluctuations (including sound).

Detailed explanation-4: -Do all fish have swimbladders? Swimbladders are only found in boney fish. Sharks and rays can maintain buoyancy in water by using oil within their body. Not all boney fish have a swimbladder though; many bottom dwelling species lost theirs as buoyancy is not necessary for them.

Detailed explanation-5: -swim bladder, also called air bladder, buoyancy organ possessed by most bony fish. The swim bladder is located in the body cavity and is derived from an outpocketing of the digestive tube.