Something to Know
A. Fill in the blanks.
1. The body organs that cannot be seen from outside are called internal organs.
2. Flat teeth are in the front of the mouth.
3. Tongue is used for tasting and speaking.
4. Saliva is secreted salivary glands.
5. Flies can transfer germs to uncovered food.
B. Match the following:
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
Answer – (b) canines (✔)
2. Ria’s mother is thirty two years old. She is likely to have-
(a) 20 permanent teeth
(c) 32 permanent teeth (✔)
(b) 20 temporary teeth
(d) 32 temporary teeth
Answer – (c) 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
Answer – (a) liver (✔)
4. The food gets completely digested in the-
(a) mouth
(b) stomach
(c) small intestine (✔)
(d) large intestine
Answer – (c) small intestine (✔)
5. An eight year old child is likely to have
(a) only temporary teeth game?
(b) only permanent teeth
(c) both temporary and permanent teeth (✔)
(d) no teeth at all
Answer – (c) both temporary and permanent teeth (✔)
D. Answer the following questions in brief.
1. Name the organ through which food enters the stomach.
Answer – Oesophagus or food pipe is the organ through which food enters stomach.
2. How many sets of teeth are formed during one’s life time? Name them.
Answer – Two sets of teeth are formed during one’s life time. They are milk (deciduous) teeth and permanent teeth.
3. Write any one difference between milk teeth and permanent teeth.
Answer – Milk teeth.
Milk teeth are 20 in number
Permanent teeth.
Permanent teeth are 32 in number
4. What do you mean by the term ‘digestion’?
Answer – Digestion is the process of breaking down of food into simpler absorbable forms.
5. What happens to the food when it enters the stomach?
Answer – When the food enters the stomach it mixes with digestive juices secreted by the walls of stomach and gets partially digested
E. Answer the following questions.
1. List five good habits that should be taken care of at the time of eating food.
Answer – Five good habits that should be taken care of cat time of eating food are –
Wash your hand before eating
Do not speak while chewing food.
Eat a balance diet.
Chew food properly before swallowing
Eat green vegetables and fruits everyday.
2. Name the different types of teeth present in the mouth. Also mention their functions.
Answer – Types of teeth and their functions are:
Flat teeth – They are used for biting and cutting the food.
Pointed teeth – They are used for tearing the food.
Broad and grooved teeth – They are used for chewing and grinding the food.
3. Why is it important to chew the food properly?
Answer – It is important to chew the food properly because it will be easy to swallow chewed food and then it arrives into the gets stomach and get properly digested.
4. Why is washing of fruits and vegetables important for us?
Answer – It is important for us to wash fruits and vegetables because unwashed fruits and vegetables can carry eggs of worms. These eggs are too small to be seen by the naked eyes. When these eggs reaches the stomach of a human, then they hatch and produces worm. These worms live in stomach and intestine and consume the food that meant for the human body.
Or
It is important to wash fruits and vegetables because unwashed fruits and vegetables carry germs which can cause serious diseases like diarrhea, vomiting or stomach ailments.
5. Sheena’s mother often tells her not to eat too many sweets and chocolates. Why do you think she says so?
Answer – Sheena’s mother often tells Sheena not to eat too many sweets and choclates because sweets and chocolate contains sugar which is not good for health. It also contains bacteria which remains on the teeth for long time, can cause tooth decay and they can fall.
6. Complete the given foodpath:
Mouth
Food pipe
Stomach
Large intestine
Small intestine
Anus
Value Based Question
It was lunch time in the school. Rahul and his friends gathered to have lunch together. All the friends started eating their lunch. Rahul did not find his lunch box in his bag. He had forgotten it at home. His friend Sanyam noticed this. He immediately offered to share his lunch with him. Rahul, however, moved out of the class. He bought some food from the vendor outside the school gate’ and ate it.
1. What would you do if you were in Rahul’s place?
Answer – I would have respected Shayam’s help and would have eaten from his lunch box or I would have asked my class teacher to call my parents and asked them to bring me my lunch box.
2. Sanyam tried to share his food with Rahul? In what situations do you share/ help your friends?
Answer – If my friend had forgot to bring his lunch box or if by mistake his lunch box fell from his hand. In this situation I would have helped my friend.
3. Do you think that eating food from roadside vendors is a healthy option?
Answer – No it is not healthy to eat from roadside vendors as their foods are uncovered and unhygienic.
Something to Do
1. Denture Making
Take some playing dough (clay) and a few peeled peanuts. Roll the clay into the shape of jaw () and place the peanuts the way your teeth are arranged on the jaws.
Colour the flat teeth, pointed teeth and broad and grooved teeth in different colours. Do not forget to give proper shape to the peanuts.
Answer – Students will do this task at their own.
2. Visit the following websites for more information on the digestive system:
(a) www.makemeagenius.org
Answer – Students will visit the above mentioned sites under the guidance of teacher/parents.