STD-4, CHAPTER-1: MY BODY, EXERCISE QUESTION ANSWERS

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CHAPTER 1 : MY BODY

EXERCISE QUESTIONS AND ANSWERS

A.     FILL IN THE BLANKS.

1.      The body organs that cannot be seen from outside are called_____ organs.

Ans: Internal

2.      Flat teeth are in the _______ of the mouth.

Ans: Front

3.      Tongue is used for _____ and ______.

Ans: Tasting and speaking.

4.      Saliva is secreted by _________.

Ans: Salivary glands

5.      Flies can transfer _______ to uncovered food.

Ans: Germs

B.      MATCH THE FOLLOWING:

1.      Milk teeth                             (a) Absorption of water

2.      Large intestine                     (b) Absorption of digested food

3.      Permanent teeth                 (c) Undigested waste is collected

4.      Rectum                                  (d) Thirty two

5.      Small Intestine                     (e) Twenty

      Ans:

1.      Milk teeth                             (e) Twenty

2.      Large intestine                     (a) Absorption of water

3.      Permanent teeth                 (d) Thirty two

4.      Rectum                                  (c) Undigested waste is collected

5.      Small Intestine                     (b) Absorption of digested food

 

C.      TICK THE CORRECT OPTION.

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

(a)   Incisors        (b) Canines          (c) Molars        (d) Premolars

      Ans: Canines

2.      Rita’s mother is thirty two years old. She is likely to have –

(a)   20 permanent teeth                       (b) 20 temporary teeth

(c)    32 permanent teeth                       (d) 32 temporary teeth

      Ans: 32 permanent teeth

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

(a)   Liver                                         (b)  Salivary glands

(c)    Stomach                                 (d) Food pipe

      Ans: liver

4.      The food gets completely digested in the –

(a)   mouth                                      (b)  Stomach

(c)    Small intestine                       (d) Large intestine

      Ans: Small intestine

5.      An eight year old child is likely to have –

(a)   Only temporary teeth                                      (b)  only permanent teeth

(c)    Both temporary and permanent teeth                 

(d)   No teeth at all

      Ans: Both temporary and permanent teeth

D.     ANSWER THE FOLLOWING QUESTIONS IN BRIEF.

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

Ans: The food enters the stomach through the food pipe.

2.      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 and permanent teeth.

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

Ans: Milk teeth are 20 in number. Permanent teeth are 32 in number.

4.      What do you mean by the term ‘digestion’?

Ans: The process by which complex food materials are broken down into simpler forms, is called digestion.

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

Ans: i) The stomach stores the food for a few hours.

ii) The food mixes with the digestive juices secreted by the walls of the stomach.

ii) The food is partially digested here.

E.      ANSWER THE FOLLOWING QUESTIONS.

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

Ans: One should,

i) wash hands before eating.

ii) chew food properly before swallowing.

iii) not speak while chewing food.

iv) eat green vegetables and fruits everyday.

v) eat a balanced diet. 

2.      Name the different types of teeth present in the mouth. Also mention their functions.

Ans: The different types of teeth present in the mouth are; incisors, canines, pre-molars and molars.

               i) Incisors - Biting and cutting the food.

               ii) Canines - Tearing the food

               iii) Premolars and Molars - Chewing and grinding the food

3.      Why is it important to chew the food properly?

Ans: i) Chewing converts the larger food particles into smaller pieces. Smaller food pieces get easily digested.

        ii) So, it is important to chew the food properly for proper digestion of food.

4.      Why is washing of fruits and vegetables important for us?

Ans: i) Unwashed fruits and vegetables can carry germs which may cause different diseases.

ii) Unwashed fruits and vegetables can also carry very small eggs of worms. When they reach our stomach, they can produce worms, making the person weak and unhealthy.

So, it is important to wash fruits and vegetables.

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

Ans: i) Sweets and chocolates are sugary food items.

ii) If sugar and bacteria are left on the teeth for long, they can cause tooth decay.

This may be the reason that Sheena’s mother often tells her not to eat too many sweets and chocolates.