DAV Class 4 Science Solution Chapter 1 My Body
DAV School Books Class 4 Science Solution Chapter 1 My Body all Question Answer. DAV Class 4 1st Chapter My Body full Chapter explanation by expert teacher.
DAV School Books Class 4 Science Solution Chapter 1 My Body:
A.)
1.) Internal
2.) Front
3.) Tasting, licking and speaking
4.) Salivary glands
5.) Germs
B.)
1. Milk teeth |
e. twenty |
2. Large intestine |
c. undigested waste is collected |
3. Permanent |
d. thirty two |
4. Rectum |
a. Absorption of water |
5. Small intestine |
b. Absorption of digested food |
C.)
1.) b.) Canines
2.) c.) 32 Permanent teeth
3.) a.) Liver
4.) c.) Small intestine
5.) c.) both temporary and permanent teeth
D.)
1.) Name of the organ through which food enters the stomach is mouth.
2.) There are 2 sets of teeth formed during one’s life. One is milk teeth and another one is permanent teeth.
3.) Difference between milk teeth and permanent teeth :-
Milk Teeth | Permanent Teeth |
These are temporary | These are permanent |
4.) The food contains carbohydrates, proteins, fats and other nutrients. These are complex materials and are broken down into simpler forms in our digestive system. This process is called digestion.
5.) Stomach is a muscular bag like organ in which food can be stored for a few hours. During this time the food mixes digestive juice secreted by the walls of the stomach.
E.)
1.) Five good habits that should be taken care of at the time of eating foods are :-
a.) wash hands before eating.
b.) chew food properly before swallowing.
c.) take food at fixed intervals.
d.) eat a balanced diet.
e.) drink about 8-10 glasses of water everyday.
2.) Name of the difference types of teeth present in the mouth are flat teeth, pointed teeth and board and grooved teeth.
Functions of the three difference teeth are given below:-
- Flat teeth: The teeth in front of the mouth are flat and are used for biting and cutting the food. They are known as incisors. There are four incisors in the upper jaw and four incisors in the lower jaw.
- Pointed teeth: on either side of flat teeth is a sharp pointed tooth. They are used for tearing the food. They are known as canines. There are four canines in all.
- Board and Grooved teeth: The teeth, present at the back of the mouth, are board and have grooves in them.They are used for chewing and grinding the food. They are known as premolars and molars. There are eight premolars in all four in the upper jaw and four in the lower jaw. They are next to the canines. The molars come after the premolars. There are twelve molars in all six in the upper jaw and six in the lower jaw.
- Digestion of food begins where we put the food in our mouth. Teeth help in breaking the food intosmaller pieces and chewing it. Here the saliva gets mixed with the food and makes it soft. Saliva converts insoluble starch into soluble sugar. For this when we chew chappati for a longer time it starts tasting a little sweet. This is due to the action of saliva on our food. So it is very important to chew the food properly for the digestion of the food.
4.) Importance of washing fruit and vegetables are given below:
a.) Unwashed fruits and vegetables can carry germs of diseases which can cause diarrhea, vomiting and other stomach aliments.
b.) Unwashed fruits and vegetables can also carry eggs of worms. These eggs are too small to be seen by the naked eyes. When these eggs reach the stomach of a human being they hatch there and produce worms. These worms live in stomach and intestines and consume the food that is meant for the human body. People having worms generally look weak, pale and unhealthy.
5.) Sheena’s mother often tells her not to eat too many sweets and chocolates because both have sugar in it. If sugar and bacteria are left on the teeth for long they can cause tooth decay.
6.) Mouth→Oesophagus(food pipe)→Stomach→Largeintestine→Small intestine→Rectum→Anus
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