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Practice each question, then open the answer or worked solution.
Question: 21
Muniya got her first tooth in September. How many months old was she then? How many months have passed from March to September?
Answer: Muniya was born on 5/03/05, and on 15/09/05, she got her first tooth. Therefore, Muniya was 6 months and 11 days old when she got her first tooth. From March to September, six months have passed.
Question: 22
How old was Muniya, when
(a) she first sat up?
(b) she got her first tooth?
Answer: (a) Muniya was 8 months and 6 days old when she sat up for the first time.
(b) Muniya was 6 months and 11 days old when she got her first tooth.
Question: 23
What did she do first
1. Walking/eating a banana?
2. Crawling/standing?
1. She ate a banana first.
2. She started crawling first.
NCERT Book Page No. 44
Question: 24
Now make a timeline of this dog’s life in your notebook.
Answer: The timeline of the dog’s life is given as follows:
| After 2 Weeks | After 3 Weeks | After 4 Weeks | In 7 Months | After 1 Year | |
| Born | It opened its eyes | It got its first teeth and started eating | It started walking around but was still wobbling | It got a full set of teeth | It was become a grown-up dog and got its own puppies |
Question: 25
Note the differences between Muniya and Rani’s puppy:
Answer: The difference between Muniya and Rani’s puppy is as follows:
| Actions | Muniya (age) | Rani’s Puppy (age) |
| Started walking | After 11 months of her birth | After 1 month of its birth |
| Ate food for the first time | 6 months after her birth | After 3 weeks of its birth |
| Got the first tooth | 6 months after her birth | After 3 weeks of its birth |
NCERT Book Page No. 45
Question: 26
Do all animals grow at the same speed?
Answer: No, the growth of all the animals is not the same.
Question: 27
Discuss about the growth of
1. A hen
2. A cow
3. A bird
Answer: The animals mentioned above grow in the following order:
A bird, a hen and a cow
Question: 28
Here are the pictures of grandfathers posing for a photograph. Who looks the oldest to you?
(a) How much older is Appu’s grandfather than Rani’s grandfather?
(b) Will Chuchoo’s grandfather ever grow as old as Appu’s grandfather?
(c) How much younger is Chuchoo rat’s grandfather than Rani’s grandfather?
(a) Elephant Appu’s grandfather’s age = 95 years old
Rani’s grandfather’s age = 70 years old
Difference between their ages = 95 – 70
= 25 years
Hence, Appu’s grandfather is older than Rani’s grandfather.
(b) No
(c) Chuchoo rat’s grandfather’s age = 2 years old
Rani’s grandfather’s age = 70 years old
Difference in their age = 70 – 2
= 68 years old
Therefore, Chuchoo rat’s grandfather is 68 years younger than Rani’s grandfather
NCERT Book Page No. 46
Question: 29
Now write which dates the following stand for:
5/5/06
20/5/06
7/6/06
1/1/07
5/5/06 5 May 2006
20/5/06 20 May 2006
7/6/06 7 June 2006
1/1/07 1 Jan 2007
Question: 30
Write the below-given dates in numbers.
1 June 2006
30 May 2006
10 August 2007
1 June 2006 1/6/06
30 May 2006 30/5/06
10 August 2007 10/8/07