Question

Which of the following animals can hear ultrasounds?
(a) Dogs (b) whales (c) bats (d) dolphins
A) a and c
B) b, c and d
C) a, b and d
D) All of these

Answer 1

Echolocation is a technique used by animals to determine the location of objects.by using reflected sound. It allows the animals to move in night darkness so that they can easily hunt, navigate, and identify enemies and avoid obstacles during movement.

Complete answer:
Echolocation is the technique in which sound waves and echoes are used to determine the locations of the object. Echolocation is used by bats to navigate and search for food in the dark. Bats send out sound waves from the mouth and nose and as the sound waves hit an object they produce echoes and bats sense it. Other animals like dogs, whales, dolphins, etc. can also hear ultrasound sounds (i.e of frequencies more than 20,000 Hz). These play an important role in the lives of these animals as it helps them to locate and hunt prey and escape from obstacles and dangers. Toothed whales have a remarkable sensory ability which is used for locating food and for navigation underwater. The production of a variety of sounds occurs by movement of air between air-spaces or sinuses in its head. Dolphins have also developed echolocation ability, often called sonar, to help them see better underwater.
So, option (D) is the correct answer.

Note: Suppression of echoes occurs in human brains, but according to some studies it can also use the sounds to echolocate in some situations example- Blind humans have been known to use echolocation to "see" their environment. Human echolocation also occurs as humans detect objects by sensing echoes by actively creating sounds. Example - lightly stomping with the foot, fingers snapping, and making noises with mouths.