Question

IN Marks
Most bars are active only at night They come out at night to find food. For centuries men who studied bats
wondered how they found their way in the dark. How could a bat with no light able to find a flying insect and
Many people used to think thar bars had unusually keen eyesight and could see by light too faint for human eyes
to detect Scientists now know that a bat's ability to navigate depends not on its eyes, but on its cars and vocal
onans
Way back in the 1%80%, an Italian roologist named Spallanani did an experiment. He blundered some bats and
released them into a room crisscrossed with silk threads. The bats flew through the maze without touching the
threads. When he plugged their ears, they became entangled in the threads. Spallanzani felt that bats used their
cars rather than their ever to find their way in the dark
In 1990, a scientist suggested that hats sent out signals that were beyond the range of human hearing. Such sounds
are called ultrasonic In 1041, no other scientists decided to use a new electronic instrument that detected ultrasonic
sounds in an experiment with bats
5. The machine showed that the bats were uttering high pitched cries, and that they were constantly squeaking as
they flew through a maze of wires that had been set up in the dark. When they taped the bats' mouths shut, the
animals blundered badly
6 bat sends out signals high pitched squeaks that bounce of anything in its path. A sound back, or reflected is
an echo The bat uses echoes to locate things in the dark
Scientists call this echolocation, and it is like our systems of radar
Source: More Tell Me Why by Arkady Leokum
1. Attempt any cight of the following questions on the basis of the passage you have read: (
188 Marks)
(0) Why do bats come out at night?
(17) What did many people use to think about bat's navigation in the dark?
(1) What have scientists now discovered?
(1) What did Spallanzani find after releasing some blinded bats into a room crisscrossed with silk threads? What
did he find aller plugging their ears?
() What did a scientist suggest in 1920?
(W) What did the new electronic instrument show?
(w.) What did the scientists find when they taped the bats' mouth?
(wit) Why do bats use echoes?​

Answer 1

Answer:

I don't understand what is the question