Bacteria and Viruses Worksheets

About These 15 Worksheets

Bacteria and viruses are tiny organisms that we can’t see with our naked eye, but they have a HUGE impact on our world. They’re behind things like the common cold and even the yummy yogurt we eat! They worksheets will help yo learn about what these organisms are, how they work, and the role they play in our lives. But these aren’t boring sheets; they are packed with fun activities and challenging questions.

Bacteria and viruses are captivating subjects with profound implications for our health, environment, and society. Our collection of 15 worksheets on Bacteria and Viruses is a valuable resource for educators and students alike. By engaging with these worksheets, students will not only gain knowledge but also develop critical thinking skills and an appreciation for the microscopic world that shapes our lives. This collection is a stepping stone toward a deeper understanding of microbiology and its real-world significance.


What they are – Bacteria are like tiny, single-celled creatures. Think of them as mini one-room apartments.

Good and Bad – Not all bacteria are bad. Some bacteria live in our tummies and help us digest food. But some can make us sick, like the ones that cause a sore throat.

Where you find them – Bacteria are everywhere! They’re on your skin, in the air, in the soil, and even in the food we eat. When you wash your hands with soap, you’re getting rid of some of the bad bacteria.


What they are – Viruses are even tinier than bacteria. They can’t live on their own, like bacteria can. They need to be inside another living thing, like a person, plant, or animal, to grow and reproduce.

Always Sneaky – Unlike bacteria, all viruses can make us sick if they get inside our bodies. They’re like naughty robbers that enter our cells and cause trouble.

Where you find them – Viruses can be in the air when someone coughs or sneezes, on things we touch if they have been touched by a sick person, or even in some foods and water.

What Types of Problems Can You Expect on These Worksheets?

Labeling Diagrams – Here, you might see a sketch of a bacterium or a virus. The challenge? Label all its parts. For instance, a bacteria diagram could have you point out the cell wall or the flagella (that’s like a tail that helps it move). Labeling helps you understand the structure of these organisms and how they’re built.

Multiple Choice Questions – These are questions with several possible answers, but only one is correct. A sample question might be – “Which of these is a virus? A) Flu, B) Bread Mold, C) Algae.” The right answer is A) Flu. Multiple choice questions test your overall knowledge and sometimes make you think hard about what you’ve learned.

Short Answer Questions – These are open-ended questions where you write a brief response. For example, “How does a virus reproduce?” Here, you’d explain how a virus needs to enter a host cell to make more of itself. Answering these helps you express your understanding in your own words.

Comparative Questions – These ask you to explain the differences or similarities between bacteria and viruses. Like, “How is the size of most bacteria different from that of viruses?” Since viruses are generally smaller than bacteria, you’d talk about that. By comparing, you understand the unique qualities of each.