2022 P5 English exam paper ACSJ (1231) Q23-Q37

Echolocation is the use of sound waves and echoes to determine where objects are in space. Bats use echolocation to navigate and find food in the (23) (a)   .

To echolocate, bats send (24) (a)   sound waves from the mouth or nose.

When the sound waves hit an object, they (25) (a)   echoes. The echo bounces off the object and returns to the bats' ears.

Bats listen to the echoes to (26) (a)   out where the object is, how big it is, and its shape.

Using echolocation, bats can detect objects as (27) (a)   as a human hair in complete darkness.

Echolocation (28) (a)   bats to find food the size of mosquitoes, which many bats like to eat.

Other animals such as dolphins, whales, shrews and some birds use echolocation too! Even humans learn to harness this skill. There are blind people who have (29) (a)   to use echolocation

to navigate within their (30) (a)   .

Humans cannot hear ultrasonic sounds made by echolocating bats but there are some insects that can hear these ultrasonic sounds. These insects (31) (a)   some moths, beetles and crickets.

When moths hear an echolocating bat, some will turn and fly away. Others will start flying in a zigzag, spiral, or looping pattern to (32) (a)   being eaten by the bat.