From Tasting to Digesting | Class 5 | EVS | C3

 

Lesson 3

From Tasting to Digesting




NCERT / MP Board Class 5 Environmental Studies Chapter 3 From Tasting to Digesting

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NCERT / MP Board Class 5 Environmental Studies Chapter 3 From Tasting to Digesting

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NCERT / MP Board Class 5 Environmental Studies Chapter 3 From Tasting to Digesting

Textual Exercise

Discuss and Write (Page 23)

1. Jhoolan’s mouth started watering when she heard the word Imli. When does your mouth water? List five things you like to eat and describe their taste.

Ans. My mouth start watering when I see some things of my taste.

List of five things of my liking and their taste

Things                 -  Taste

Chat                     - Sour Taste

Toffe                    - Sweet

Samosa               - salty-spicy

Pickles                - sour

Ice-cream           - sweet


2. Do you lie only one kind of taste or different ones? Why?

Ans. I often like to change my taste because I get bored of only one kind of taste.

3. Jhoolan put a few drops of lemon juice in Jhumpa’s mouth. Do you think we can make out the taste with just a few drops?

Ans. Yes. A few drops of sour things give us enough taste.


4. If s omeone were to put a few seeds of saunf (aniseed) on your tongue, would you be able to tell with your eyes closed? How?

Ans. Yes. I can tell, with my closed eyes by its smell and taste.


5. How did Jhumpa make out the fried fish? Can you guess the names of certain things only by their smell, without seeing or tasting them. For example, orange, lemon, curd, some sweets, samosa etc.

6.  How anyone ever told you to close your nose before taking a medicine? Why do you thnk they tell you to do this?

Ans. Sometimes we are told to close our nose before taking medicine which close not taste good.

 

Close your eyes and tell (Page 24)

7. Collect a few food items having different kinds of taste. Play a game with your friends like Jhumpa and Jhoolan did. Tell your friend to taste the food and ask:

1. How did it taste? What was the food item?

Ans. The taste was sweet. The food item was sugar.


2. On which part of the tongue could get the most taste-in front, the back, on the left or right side of the tongue?

Ans. It was on front of my tongue.

Note : Different parts of tongue have different taste zones.


3. Which taste could be make out on which part of the tongue? Mark these parts on the picture given.

Ans.

Tongue,
 8. One at a time put some things to eat in other parts of your mouth-under the tongue, on the lips, on the roof of the mouth. Did you get any taste there?

Ans. No. I did not get any taste.


9. Use a clean cloth to wipe the front part of your tongue so that it is dry. Put some sugar or jiggery there. Could you taste anything? Why did this happen?

Ans. No. I could not taste anything. It is because we get the taste when food mixes up with saliva and reaches taste buds present on the tongue.


10. Stand in front of a mirror and look closely at your tongue. How does the surface look? Can you see any tiny bumps on the surface?

Ans. The surface looks rough. Yes, tiny bumps are seen on the surface of the tongue.


Tell (Page 25)

11. If someone asks you to describe the taste of amla or cucumber, you might find it difficult to explain.

How would you describe the taste of these- tomato, onion, saunf, garlic.

Think of words that you know or make up your own words to describe the taste.

Ans.

No.

Food

Taste

1.

Onion

Pungent

2.

Tomato

Sweet-sour and juicy

3.

Saunf

Sweet-aromatic

4.

Garlic

Punent-aromatic

 

12. When Jhumpa tasted some of the things, she said ‘Sssee, sssee, sssee...........’ What do you think she may have eaten?

Ans. She may have eaten a chilli.


13. Why don’t you make sounds that describe some taste?

From you expressions and sounds ask your friends to guess what you might have eaten.

Expressions and sounds

Food

Yum-yum

Any sweet, ice-cream, etc.

The sound made by lliking something

Pickle, tamarind etc.

The sound made by eating something very cold.

Ice

 

Chew it or chew it well; What’s the difference? (Page 25)

Try this together in class:

 Each of you take a piece of bread or roti or some cooked rice.

Put it in your mouth, chew three to four times and swallow it.

Did the taste change as you chewed it?

Ans. There was very little change in taste.

Now take another piece or some rice and chew it twenty to twenty-five times.

Was there any change in the taste after chewing so many time?

Ans. Yes, there was a change in taste.

 

Discuss (Page 26)

14. Has anyone at home told you to eat slowly and to chew well so that the food digests properly? Why do you think they say this?

Ans. Yes, my father often told me to eat slowly and to chew well to get maximum nutrition and digest well.


15. Imagine you are eating something hard like a green guava. What kind of changes take place in it. From the time you bite a piece and put in your mouth to when you swallow it?

Think what does the saliva in our mouth do?

Ans. At the start, it is hard and taste bitter. Afterwards, it becomes soft and sweet and easy to chew.

 Saliva make the food soft and also helps to chew and swallow.

Straight from the heart (Page 27)


16. Where do you think the food must be going after you put it in your mouth and swallow it? In the picture given here, draw the path of the food through your body. Share your picture with your friends. Do all of you have similar pictures?

Ans. The food we eat first goes to the stomach and then to the intestines.

Yes, the pictures drawn by us are almost similar.

 Discuss (Page 27)

 17. How do you feel when you are very hungry? How would you describe it? For example, sometimes we jokingly say ‘I am so hungry, I could eat an elephant!”

Ans. When I am very hungry. I feel restless and an empty sensation. In the stomach, I want to eat something immediately.


18. How do you come to know that you do not eat anything for two days?

Ans. If I do not eat anything for two days, I will become weak. I will be unable to work in normal way.


20. Would you be able to manage without drinking water for two days? Where do you think the water that we drink goes?

Ans. No. I will not be able to manage without drinking water for two days. The water we drink is used in various metabolic activities. Much of it is excreted out of the body through urine and sweat.

 

Talk and Discuss (Page 28)

 

 21. Do you remember that in Class IV you made a solution of sugar and salt? Nitu’s father also made this and gave her. Why do you think this is given to someone who has vomiting and loose motions?

Ans. The quantity of water, salts and sugar decreases in our body when we have vomiting and loose motions. A solution of sugar and salt is given to make up this loss in our body.


22. Have you heard the word ‘glucose’ or seen it written anywhere? Where?

Ans. Yes, I have heard the word glucose. It is also written on glucose packets. It is seen in various advertisements on TV and in newspapers.


23. Have you ever tasted glucose? How does it taste? Tell your friends.

Ans. Yes. I have tasted glucose. It is sweet in taste.


24. Have you or anyone in your family been given a glucose drip? When and why? Tell the class about it.

Ans. Yes. Once I had vomiting and loose motions. I became very weak. I was given glucose drip. Then I regained strength.


25. Nitu’s teacher used to tell the girls to have glucose while they were playing hockey. Why do you think she did this?

Ans. Sweating causes lots of water and salt from the body. Also a lot of energy in exhausted. Glucose provides instant energy. That is why the teacher used to tell the girls to have glucose while they were playing hockey.


26. Look at Nittu’s picture and describe what is happening. How is the glucose drip being given?

Ans. Glucose drip is being given to Nitu. The glucose bottle is hanging on a stand. Solution of glucose is being given through a tube and a needle slowly drop by drop.


Think and Discuss (Page 31)

27. Imagine. If you had been in place of Dr. Beaumont, what experiments would you have done to find out the secrets of our stomach? Write about your experiments.

Ans. I place of Dr. Beaumont, I would have done experiments with digestive juices from Martin’s stomach in three different glasses. Then I would have mixed equal quantities of milk, curd and cheese. I those glasses and checked out which digested fast.

 

Discuss (Page 33)

28. Why do you think Rashmi could eat only one roti in the whole day?

Ans. Rashmi belongs to a poor family. That is why she could eat only one roti in the whole day.


29. Do you think Kailash would liked games and sports?

Ans. No, his body is fat and fabby.


30. What do you understand by ‘proper’ food?

Ans. Proper food means adequate and nutritious food according to one’s body requirement.


31. Why do you think that the food of Rashmi and Kailash was not proper?

Ans. Rashmi is not getting adequate food. Kailash is taking more food than his requirement. He is eating chips, burger, pizza and soft drink which are harmful for his health.


 

Find out (Page 33)

32 Talk with your grandparents or elderly people and find out about what they are and what work they did when they were of your age.

Now think about yourself. your daily activities and daily diet.

                Are these similar or different from what your grandparents did and ate?

Ans. My grandparents worked much more than me. They used to go to school on foot. They worked in fields taking care of cattle. They used to eat dal-rice, green vegetables, roti, milk and milk products.

                Our daily activities and diet are different from our grandparents. We do less physical work and prefer chips, burger, pizzas and soft drinks than home-made food. We spend most of our time in watching TV and playing on mobile sets.

 

Think and discuss (Page 34)

33. Do you know any child who does not get enough to eat in the whole day? What are the reasons for this?

Ans. I know a few children near my colony who do not get enough food. The reason is poverty and un-employment.


34. Have you ever seen a godown where a lot of grain has been stored? Where?

Ans. Yes. In the nearby whole-sale market. I have seen many godowns with lot of grain stored in them.

 

What we have learns (Page 34)

35. Why can you not taste food properly when you have a cold?

Ans. When we have cold, our nose gets block, we cannot smell properly and hence cannot taste properly.


36. If we were to say that ‘digestion begins in the mouth’, how would you explain this? Write.

Ans. An enzyme called salivary amylase is found in the saliva of our mouth, which breaks down large molecules of carbohydrates into smaller ones. These are easily and quickly absorbed by the intestine. So it is said that digestion begins in the mouth.

 (Note - Images are used only for info)

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