Teeth and Digestion for class 4 Questions and Answers

Teeth And Digestion

Fill in the blanks:

1. Milk teeth are also known as temporary teeth.
2. The root of a tooth is inside the gum.
3. The enamel is the hardest substance in the human body.
4. Canines are tearing teeth.
5. We must visit a dentist in case of a tooth problem.
6. Bile, a digestive juice, is secreted by the liver.

Match the columns A and B:

1. Oesophagus (d) Food pipe
2. Germs (e) Plaque
3. Canines (a) Tearing teeth
4. Enamel (b) Outer layer
5. Incisors (c) Cutting teeth
Write 'T' for true and F' for false statements given below:
1. Temporary set of teeth in small children are called milk teeth [T]
2. Molars are grinding teeth. [T]
3. A yellow sticky layer of germs on our teeth is called plaque. [T]
4. Premolars are tearing teeth. [F]
5. A tooth has four parts. [F]
6. We should eat a balanced diet. [T]

Answer the following questions.

1. How do teeth help us?

i) Teeth enable us to bite and chew food.
ii) Teeth help to make food easily digestible.
iii) Teeth help us to speak clearly and give proper shape to our face.

2. What do you mean by milk teeth?

When a baby is two and half years old, about 20 teeth have grown out of its gums. This set of teeth is called milk teeth.

3. Mention the different parts of a tooth.

A tooth has three parts -
i) The Crown
ii) The neck
iii) The root

4. Describe the different types of teeth.

As per the kind of work which the teeth perform, they are of four kinds -
a) Incisors
b) Canines
c) Premolars
d) Molars

5. How many molars do you have?

There are six molars in each jaw. Eight molars grow first, four molars grow later.

6. How can we keep our teeth healthy and strong?

i) We should brush our teeth at least twice a day.
ii) We should rinse our mouth properly after eating anything.
iii) We should drink plenty of milk. Milk has calcium which makes the teeth strong.

7. What do you mean by digestion? Describe the process of digestion.

The process by which food is broken into a simple form so that it can be absorbed by our body easily is called digestion. Digestion is a long process and it takes place step by step.
After taking food into our mouth we chew it well. On being chewed it breaks down into smaller bits and turns into a paste. The salvia present in the mouth makes the food soft and smooth so that it may be swallowed easily.
food bitten and chewed by the teeth reaches the stomach through the oesophagus or food pipe. There are several digestive juices present in the stomach. Here the food is further broken down into simple substances.
From the stomach, the food goes to the small intestine. Bile, a digestive juice and some other digestive juices also mix with the food here. Together they break down the food further and complete the process of digestion. The food is converted into liquid form and is absorbed into the blood through the walls of the small intestine. The undigested part of the food is passed to the large intestine. water present in the food is absorbed by the walls of the large intestine. The remaining waste is passed out of the body through the anus.

8. What is the function of large intestine ?

Large intestine absorbs the remaining water Content of undigested food.

9. Differentiate between incisors and canines.

Incisors	Canines
i) These teeth are also Called cutting teeth	i) These teeth are also Called tearing teeth.
ii) We have eight incisors, for each in the upper and lower jaw.	ii) We have four canines, two each in the upper and lower jaw.