NCERT  Solutions for Class 5 EVS Chapter 1 Super Senses

QUESTIONS FROM TEXTBOOK SOLVED

1.How did the ant know that the other ants were not from its group?
Ans. Ants and other animals also have different senses. They can see, hear, smell and feel. Due to different senses the ant could know that other ants were not from its group.

2.How did the guard ant recognise this ant?
Ans. The guard ant could recognise this ant because of smell.

Try This and Write
Drop some sugar, jaggery or anything sweet on the ground. Wait until the ants come there.
1.How long did it take for the ants to come?
Ans. It took about 15-20 minutes for ants to come.

2.Did one ant come first or a group of ants came together?
Ans. One ant came first, followed by a group of ants.

3.What did the ants do with the food?
Ans. The ants carried the food to their hole.

4.Where do they go from there?
Ans. They go to their hole from there.

5.Do they move in a line?
Ans. Yes, they move in a line.
Now carefully, without harming the ants, block their path for a while with a pencil.

6.Now, observe, how do the ants move?
Ans. Ants climb up on the pencil. They still move in a line.

7.Now can you guess why the ants behaved like that when you blocked their path?
Ans. As the ant moves, it leaves a smell on the ground. The other ants follow this smell to find the way. Thus, when their path was blocked, ants tried to maintain their path by following the smell.

8.Have you ever been troubled by mosquitoes? Just think, how do they know where you are?
Ans.Mosquitoes can recognise the smell of our body. They can also recognise us by the heat from our body.

9.Have you seen a dog sniffing here and there? What do you think it is trying to smell?
Ans.Yes, I have seen a dog sniffing here and there. A dog can make out the presence of another dog in the area by smelling its urine or faeces. The dog usually smells to find out if a new dog has come in the area.

Write
1. In what ways do human beings make use of this special sense of smell of dogs?
Ans. This special sense of smell of dogs is used by humans in many ways. Some examples are as follows:
(a) For catching criminals.
(b) For detecting stolen goods.
(c) For detecting bombs.

2. When do you find your sense of smell helpful to you?List some examples. Like— to know by its smell that food has gone bad or that something is burning.
Ans. Apart from smelling bad food or a burning object, we can also recognise the smell of following:
Tasty food, perfume, incense sticks, flowers, sweaty cloths, gas leak in the kitchen, etc.
Name the animals that you would be able to recognise only by their smell, without seeing them.
Ans. We can recognise following animals by their smell:Dogs, cats, buffalo, cow, fish, etc.

3. Write the names of five things whose smell you like and five things whose smell you do not like.
Ans.

4.Do you and your friends have similar answers?
Ans. Yes, our answers are similar.

Do and Find Out
1. From the smell of the clothes of your family members, can you say whom do they belong to? Try to recognise the clothes of any two members of your family in this way.
Ans. Yes, I can recognise the clothes of my family members by their smell. I could recognise the clothes of my mother and father.

Think and Discuss
1. Sushila covered her nose when she cleaned Deepak’s nappy, but not when she cleaned her daughter. Why do you think she did this?
Ans. When we feel something is dirty, we find its smell bad. In case of Sushila, she thought Deepak’s nappy to be dirty. So, she had to cover her nose. When she was cleaning her daughter’s nappy she did not think of it being dirty.

2.How do you feel when you walk near a heap of garbage? Think of the children who spend the whole day picking things from such garbage.
Ans. I feel bad when I walk near a heap of garbage. Children who spend the whole day picking things from such garbage become used to the smell. Their minds do not get offended by the smell.

3.Is a smell ‘good’ or ‘bad’ for everyone in the same way? Or does it depend on how each one feels about it?
Ans. It depends on how the person thinks about a particular smell. But some smells can always be bad for most of the people.

Let’s See
1. Write the name of a bijd which has eyes in front of its head (like in humans).
Ans. Owl.

2.Write the names of some birds which have eyes on either side of the head. What is the size of their eyes as compared to the size of their head?
Ans. Following birds have eyes on either side of the head:
Pigeons, crows, sparrows, eagles, etc.
Their eyes are very small as compared to the size of their head.

Looking with One or Both Eyes
1.Could you see your friend’s action, without moving your neck?
Ans. I could not see my friend’s action, without moving my neck.

2.Now try to look at your friend’s action with both your eyes open but without moving your neck.
Ans. I! could see my friend’s action now.

3. What was the difference on looking with one or both eyes?
Ans. I can see a wider area with both eyes as compared to with one eye. I can see better with my both eyes open.

4.Now toss a small ball or a coin and try to catch it. Try this with both your eyes open. Then close one eye and try to catch it. When was it easier to catch?
Ans.It was easier to catch the ball with both eyes open.

5.Imagine how it would be to have your eyes in place of your ears? What would you be able to do then, which you cannot do now?
Ans.If there were eyes on the sides of my head, I could see on my left and right without moving my neck.
Some birds, like kites, eagles, vultures can see four times as far as we can. These birds can see things from a distance of eight metres, what we can see from a distance of two metres.

6.Now can you guess from what distance can an eagle in the sky see a roti on the ground?
Ans.An eagle can see a roti on the ground from a distance of one and a half km to 2 km.

Write
1.The names of ten animals whose ears can be seen.
Ans. Dog, cow, cat, buffalo, rabbit, elephant, lion, zebra, giraffe and mouse.

2. The names of some animals whose ears are bigger than our ears.
Ans. Elephant, rabbit, cow, buffalo, dog, etc. have ears bigger than our ears.

Think
1.Is there some link between the size of animals’ ears and their hearing?
Ans. There is possibly a link between the size of animals’ ears and its hearing. Animals with bigger ears have better hearing than animals with smaller ears.

Try This
1. For this activity find Ask your friends too.
Ans. When I put my hands behind my ears, the sound was sharper.