Question

Give one word for the following.

• A special organ found in whales that give them the advantage to sink or rise at their own will in seawater.

Answer 1

1. A special organ found in whales that give them the advantage to sink or rise at their own will in seawater is called the swim bladder.
2. The swimming or sinking depends on the liquid displaced by the body.
3. When the swim bladder expands, its volume increases.
4. Increase in volume of the bladder helps the whale in displacing more water.
5. Hence, the buoyancy increases, and whales float upward.
6. When the swim bladder deflates the fish's buoyancy decreases and it will sink as it displaces less water.
7. 

Hence, the special organ is the swim bladder.