class iv science question answer my body

MY Body

A.Fill in the blanks

1.The body organs that cannot be seen from   outside are called  ………………internal…………………organ.

2.Flat teeth are in the   ……front………………..of the mouth.

3.Tongue  is used for ……tasting………..& speaking

4.Saliva is secreted  by …………salivary glands.………….

5.Flies can transfer  germ to uncovered food

B.Match the following

1.Milk teeth                  twenty

2.Large intestine          absorption of water

3.Permanent teeth      thirty two

4.rectum                        undigested waste is collected.

5. small intestine         absorption of digested food.

c.Tick   the correct option

1.The teeth used  to tear food into pieces are known as

Ans(b) Canines

2.Ria’s mother is  thirty two years old .she is likely to have –

Ans:( c) 32 permanent teeth.

3.The organ ,which secrete digestive juices in the small intestine is the –

Ans(a) liver.

4.The food gets  completely digested in the    

Ans: ( C)  small intestine.

5.An  eight  year old child is likely to have

Ans: (c) Both temporary   and permanent teeth.

D1.Name  the organ through which food enters the stomach.

Ans: Food  enters the stomach through food pipe (esophagus)

D2.How many sets of teeth are formed during one’s life time? Name  them

Ans: Two sets of teeth are formed during one’s life time.

 They are temporary teeth &Permanent teeth .

D3.Write any one difference between milk teeth and permanent teeth.

Ans: The  difference between  milk teeth and permanent teeth is milk teeth fall down within the age 6 to 12 where as permanent teeth remain till death of the person.

D4. What do you mean by the term digestion?

Ans: Digestion is a process in which complex food material are

Converted into simpler substances by help of different enzymes is called digestion.

D5.What happens to the food when it enters the stomach?

Ans: When the food enters into the stomach, the food is stored there for few hours. During this time the food mixes with hydrochloric acid &digestive juices secreted by the wall of the stomach. The food is partially digested here.

E1.List five good habits that should be taken care of at the time of eating  food.

Ans:Five good habits that should be taken care of at the time of eating  food are:

E2.Name the different  types of teeth present in the mouth   .Also mention their function.

Ans:There are four types of teeth present in human mouth.They are incisor, canines, pre-molar and molar.

Function of different types of teeth are:

Incisor: helps to cut the food

Canines: Help to tear the food

Premolar & molar: helps in grinding the food.

 E3.We should chew the food properly to  mix with saliva for good digestion.

E4. Unwashed fruits and vegetable carry germs and eggs of worms. These eggs and germs are too small  to see in naked eye.If these  unwashed fruits  and vegetable are eaten  they will cause diarrhea, vomiting and stomach ailments.

E5.Sheena’s mother often tells her not to eat too many sweets and chocolates.Why do you think she says so?

Ans: Sheena’s mother often tells her not to eat too many sweets and chocolates because chocolates and sweets are the main cause of dental cavity & caries.

                         Value Based Question

Vbq2:In what situations do you help or share with your friends?

Ans:1)When my friend forgot to bring  lunch box ,I share my lunch with him.

2)I share  my pen ,pencil ,eraser and books when my friend needs.

3)I share my note books with my friend ,when he/she is absent from class.

Vbq3.Eating food from roadside vendor is not healthy practice because it causes many diseases like vomiting, diarrhea, jaundice and dysentery.

Extra questions

1.    a)Which one is largest gland of human body   Ans: Liver

2.Name parts of digestive system where no digestion takes place?

Ans: esophagus and large intestine

3)How many pairs of salivary glands are present in human mouth?  Ans: 3  pairs

4)How many incisor are there in human mouth?  Ans: Eight

5. Write name of some disease which may cause by eating uncovered food or unwashed fruits or vegetables?

Ans: Jaundice, cholera, vomiting & diarrhea

6. Which type of foods are digested by saliva? Ans: carbohydrate.

7. What is the hardest part of human body?  Ans: Tooth enamel

8. Which teeth are absent in a child?  Ans: wisdom teeth

9. Where the undigested food is stored?  Ans: Rectum

10.Write name of some fruits which give exercise to our gums?

Ans: channa, guava, radish, carrots.

Fill in the blanks  with correct answer.

11. Bile is secreted by liver and stored by gall bladder

12.Calcium and phosphorous keeps bone and teeth healthy

13…incisor teeth are used to biting and cutting the  food.

14.In …large intenstine…………. Water are absorbed from undigested food.

15.The molar which grow at the age of 18 to 20 are called wisdom …………….. teeth .