Class-5 EVS Chapter-1 Super Senses/NCERT
Chapter-1
Super Senses
Fill in the blanks:
1- Some male insects can recognize their females by their smell.
2- Kites, eagles and vultures can see four times as
far as we can.
3- Animals that are awake at night can see things only in black
and white.
4- Elephant, rabbit, cow and buffalo have ears bigger
than our ears.
5- Fishes give alarm call by electric signals.
6- As the ants move, they leave a smelly trail behind them.
6- As the ants move, they leave a smelly trail behind them.
State whether the following statements are true or false:
1- Animals can see as many colours as we can. False
2- Animals with bigger ears have better hearing than animals
with smaller ears. True
3- Snakes do not have external ears. True
4- Some animals start behaving in a different way when an
earthquake or storm is about to come. True
5- Dolphins make different sounds to give message to each
other. True
Human beings are biggest threat to animals. Many animals are
killed and their parts are sold. Match these animals with their parts which are
sold.
A
|
B
|
Elephants
|
For horn
|
Rhinoceros
|
To make little scent from its musk
|
Tigers, crocodile and snakes
|
for their tusks
|
Musk dear
|
for skin
|
Ans
A
|
B
|
Elephants
|
for their tusks
|
Rhinoceros
|
For horn
|
Tigers, crocodile and snakes
|
for skin
|
Musk dear
|
To make little scent from its musk
|
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Answer these questions:
Q. How do mosquitoes find us?
Ans- Mosquitoes can find us by the smell of our body, smell
of the sole of our feet and the heat of our body.
Q. Why does a dog sniff here or there?
Ans- Dogs mark out their own area on the road. They can make
out if another dog has come into their area by the smell of its urine or potty
(latrine).
Q. How do the ants recognize the ants of other group?
Ans- Ants can easily distinguish the ants of other group by
smell. Ants perceive smell by their long thin antennae.
Q. Is a smell ‘good’ or ‘bad’ for everyone in the same way?
Or does it depend on how each one feels about it?
Ans- A smell can not be good or bad for everyone in the same
way. Though some smells can be bad for most of the people, it also depends on
how each one feels about it.
Q. How do snakes hear?
Ans- Snakes do not have external ears which we can see. They
only feel the vibrations on the ground.
Q. How does a langur warns others of dangers like a tiger or
leopard?
Ans- High up on a tree, a langur warns others of dangers by
making a special warning call.
Q. How do birds give alarm call?
Ans- Birds give alarm call by making different sounds for
different kind of dangers. For example, there is a different warning call if
enemy is coming from the sky or if the enemy is on the ground.
Q. Write the name of a bird which has eyes in front of its
head (like in humans).
Ans- Owl has eyes in front of its head like humans.
Q. How do birds focus? Write the names of some bird which
have eyes on either side of the head.
Ans- Most of the birds have their eyes on either side of the
head. Their eyes can focus on two different things at a time. When they look
straight ahead, both eyes focus on the same object. Following birds have eyes
on either side of their head:
(1)
Pigeon
(2)
Sparrow
(3)
Parrot
(4)
Cuckoo
Q. You must have seen birds moving their neck very often. Do
you know why?
Ans- In most of the birds, eyes are fixed and cannot move.
So birds have to turn their heads to see around.
Rewrite the following para by filling the missing information
about sloth.
Sloth looks like a ______ but it is not. It spends almost _____
hours a day sleeping while hanging _____________ on a tree branch. The sloth
eats the _________ of the same tree on which it lives. It hardly eats
anything else. When it has eaten enough leaves from that tree, it moves to ________
tree. Sloths live for about ________ years and in that time they move only _______
trees. Once a week it comes down from the tree to relieve itself.
Ans-
Sloth looks like a bear but it is not. It spends almost 17
hours a day sleeping while hanging upside down on a tree branch. The sloth eats
the leaves of the same tree on which it lives. It hardly eats anything else.
When it has eaten enough leaves from that tree, it moves to nearby tree. Sloths
live for about 40 years and in that time they move only eight trees. Once a
week it comes down from the tree to relieve itself.
Write the names of five smell you like and five things whose
smell you do not like.
I like the smell of
|
I do not like the smell of
|
Roses
|
Stale food
|
Room Freshner
|
Rotten eggs
|
Biryani
|
Garbage in dustbin
|
Floor cleaner
|
Cow dung
|
Incense stick
|
Dead animals
|
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