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Lesson Bacteria: What and How? - Study

Instruction

Read the information below carefully several times and try to remember the key points.

Click on a chapter to view the information.

Tip: read the information out loud (but in such a way that you do not disturb others).

1. Very Small

Bacteria are very, very small organisms (living things) measuring 0.00001 cm (1 ten-thousandth of a centimeter). They consist of only one cell and you can only see them with a microscope.


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2. Diseases

Bacteria can cause all kinds of diseases. Also contagious diseases such as tuberculosis, diphtheria, the plague and cholera.


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3. Protect

You can protect yourself against bacteria by washing thoroughly (especially your hands) with soap and disinfectant gel, sunlight, vaccinations and medicines that kill the bacteria (disinfect).

Fortunately, most bacteria are good bacteria. We even need them to stay healthy.


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4. Multiplication

Bacteria multiply very quickly. For example, by hot air on stagnant water.

From a single bacterium, 70 million new bacteria can develop within one day.


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5. 30 second rule

If you wash your hands gently and thoroughly for 30 seconds with soap and warm water, you can get rid of many disease-causing bacteria from your hands.

Until recently it was the 20 second rule. But 20 seconds turns out to be insufficiently effective in practice.

Sing a song in your head that lasts 30 seconds. That helps to do it long enough.


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Key points

Key points to remember are:

  • Bacteria are invisibly small
  • Bacteria are organisms
  • Bacteria can make you sick
  • Bacteria grow very quickly
  • Bacteria don't like soap

Next step

Once you have gone through the above information a few times, start doing the exercises that go with it.

Practice

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Primairy School Wisdoms

These are the fundamental life lessons and pieces of advice that often get instilled in us during those formative years. They might seem simple, but they lay the groundwork for how we navigate the world.

Here are 7 key wisdoms often learned (or at least introduced) in primary school:

1 - Honesty is the best policy. his instills the value of truthfulness and integrity. It teaches that while being honest might be difficult sometimes, it builds trust in the long run.

2 - Try your best.This emphasizes the importance of effort and personal growth, regardless of the outcome. It encourages a positive attitude towards challenges.

3 - It's important to ask for help when you need it.This encourages seeking support, recognizing limitations, and understanding that it's a sign of strength, not weakness.

4 - Listen carefully when others are speaking.This develops active listening skills, shows respect, and aids in understanding. It's crucial for effective communication.

5 - Sharing is caring.This teaches the importance of generosity, cooperation, and considering the needs of others. It's a foundational concept for building positive relationships.

6 - Everyone makes mistakes; it's okay to try again. This fosters resilience, encourages learning from errors, and reduces the fear of failure. It highlights the importance of perseverance.

7 - Be kind to everyone. This extends beyond just treating others well; it emphasizes inclusivity, compassion, and understanding towards all individuals, regardless of their differences.

These wisdoms are often conveyed through stories, classroom rules, teacher guidance, and interactions with peers. They form a moral and social compass that helps children navigate their early years and beyond. While we might refine or expand on these ideas as we grow, their core messages often stick with us throughout life.

Fun Animal Facts

Here are 7 fun animal facts perfect for primary school children:

1 - Snails can sleep for up to three years: That's a very long nap!

2 - Kangaroos cannot walk backward: Their big tails and strong legs make it difficult.

3 - A lion's roar can be heard from as far as 5 miles away: That's louder than you might think!

4 - A giraffe has the same number of bones in its neck as a human: That's right, both have seven neck bones, but a giraffe's are much, much longer!

5 - A hummingbird can fly backward: They are the only birds that can fly in all directions, even upside down!

6 - Male seahorses give birth to their babies: The female lays eggs in a pouch on the male's belly, and he takes care of them until they hatch.

7 - The fingerprints of a koala are so close to humans' that they could confuse crime scene investigators!

These are just a few of the many amazing facts about animals! The animal kingdom is full of surprises.

Country Facts

Let's explore some fun facts about 7 different countries that you might find interesting!

1 - United States: It has many different landscapes, from sunny beaches in California to snowy mountains in Colorado, and it's the birthplace of Hollywood movies.

2 - India: It's the birthplace of yoga and has many colorful festivals, like Holi, where people throw colored powder at each other.

3 - Kenya: You can see amazing wild animals like lions, elephants, and zebras in their natural habitats in Kenya's national parks.

4 - Madagascar: This island country is home to lemurs, funny-looking primates that are found nowhere else in the world.

5 - China: The Great Wall of China is so long that it can be seen from space (though it's debated how easily)! They also invented paper and the compass.

6 - Sweden: This is where the Nobel Prizes are awarded each year, and it's known for its colorful wooden houses.

7 - Australia: It's home to kangaroos and koalas, and some of its beaches have sand that squeaks when you walk on it!

We hope these snippets give you a fun glimpse into different countries around the world! Each one has its own unique and fascinating things to discover.