Teeth and Microbes for Class 4 Worksheet

Teeth and Microbes for Class 4 Worksheet pdf – This Teeth and Microbes for Class 4 worksheet provides students with an engaging and informative way to learn about the different types of teeth and the role of microbes in oral health. The worksheet includes activities like filling in the blanks, true or false questions, and short answer prompts to help students understand the functions of incisors, canines, premolars, and molars. It also covers the importance of saliva in digestion, the formation of plaque, and how microbes can be both harmful and helpful. This printable PDF is a useful resource for students and teachers to enhance learning and comprehension in a fun and interactive way.

teeth and microbes class 4 questions and answers

Fill in the Blanks

1. Humans have two sets of teeth: milk teeth and permanent teeth.
2. The outer layer of a tooth is called enamel.
3. Microbes are seen under a microscope.
4. Tooth decay is caused by bacteria from sugary food.
5. Brush your teeth twice a day.
6. Adults have 32 permanent teeth.
7. The sharp teeth used for tearing food are called canines.
8. Plaque is the sticky layer of bacteria on teeth.
9. Drinking water can help wash away food particles.
10. Flossing helps to remove food stuck between teeth.

True or False

1. Microbes are visible to the naked eye. (False)
2. Plaque is a sticky layer of bacteria on the teeth. (True)
3. We should brush our teeth only once a week. (False)
4. Drinking water can help wash away food particles. (True)
5. There are 32 teeth in a child’s mouth. (False)

What is the role of saliva in digestion?
Saliva helps break down food by mixing with it, starting the process of digestion. It contains enzymes that break down starches into sugars and helps in swallowing food easily.

Explain the statement, ‘microbes can also be useful to us.’
Not all microbes are harmful. Some microbes help in digestion, produce vitamins in our body, and are used in the production of food like yogurt and cheese. They also help in breaking down waste in the environment.

How is plaque formed? Why does it harm the tooth?
Plaque is formed when food particles and bacteria combine on the surface of the teeth. It harms the tooth because the bacteria in plaque produce acids that can damage the tooth enamel, leading to tooth decay and cavities.