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CBSE Class 4 EVS Worksheet

Teeth and microbes

1.
State TRUE/FALSE: We must avoid having too many sweets because they spoil our teeth.
A) true B) false
2.
What are functions of molars and premolars?
3.
How is tooth decay caused?
4.
Why should we avoid consuming too much of sweets?
5.
How can we keep our teeth healthy?
6.
How are microbes useful to us?
7.
How are teeth important to us?
8.
What will happen to our teeth if we do not brush them regularly?
9.
State TRUE/FALSE: A microbe is as small as a grain of sand.
A) true B) false
10.
State TRUE/FALSE: Protozoa are tiny organisms that grow on decaying matter.
A) true B) false
11.
Why should we wash our hands after every meal?
12.
What types of foods are good for our teeth?
13.
State TRUE/FALSE: Protozoa are unicellular.
A) true B) false
14.
State TRUE/FALSE: Ringworm is caused by fungi.
A) true B) false
15.
What are fungi?
16.
Fill in the blanks: Brushing the teeth ____ a day is essential.
A) Once B) Thrice C) Never D) Twice
17.
State TRUE/FALSE: Viruses are the largest microbes.
A) true B) false
18.
Fill in the blanks: Eating too many ____ causes tooth decay.
A) Vitamin C B) Minerals C) Fats D) Sweets
19.
State TRUE/FALSE: Bones enable us to bite and chew food that makes digestion easy.
A) true B) false
20.
State TRUE/FALSE: Enamel is the hardest substance in the body.
A) true B) false

CBSE Class 4 EVS Worksheet

Teeth and microbes

Answers

1.
Option A

2.
Molars and premolars are used for crushing and grinding food.
3.
Sometimes bits of food remain stuck to the teeth and can cause the growth of bacteria. Bacteria attack the enamel and form a sticky coating called plaque. Then they attack the dentine and finally pulp. When the bacteria reaches the nerves within the pulp, it results in severe pain hence tooth decay is caused.
4.
We must avoid having too many sweets because they spoil our teeth.
5.
We can keep our teeth healthy by brushing early in the morning and before going to sleep and washing mouth after every meal.
6.
Microbes are used in changing milk into curd, produce vitamins in our body, help in decomposition of living organisms, help in digestion of roughage in animals.
7.
Teeth give proper shape to our face. They help us to speak clearly. They enable us to bite and chew food which makes digestion easy.
8.
If we do not brush our teeth regularly they may decay and fall off.
9.
Option B
10.
Option B

11.
We must wash our hands so that the germs stuck to our hands are washed away.
12.
Foods like milk, cheese and cottage cheese are good for our teeth.
13.
Option A
14.
Option B

15.
Fungi are tiny organisms that grow on decaying matter.
16.
Option D
17.
Option B
18.
Option D
19.
Option B
20.
Option A

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