Test: Microorganisms - Year 7 MCQ

Bacteria are responsible for fermenting milk into yogurt through the process of fermentation.

Fungi, particularly yeast, are used in the fermentation process to produce bread and beer.

Influenza is a disease caused by a virus that infects the respiratory system.

Microorganisms are too small to be seen with the naked eye, so a microscope is necessary to observe them (Option B is correct). A telescope is used to observe distant objects in space (Option A is incorrect). A spectrometer measures the properties of light (Option C is incorrect). An X-ray machine is used for medical imaging (Option D is incorrect).

Viruses are much smaller than bacteria and are not considered living beings because they cannot carry out life functions on their own. They need a host organism to survive and reproduce. Unlike bacteria, viruses do not participate in food fermentation processes, and they cannot be treated with antibiotics.

Bacteria are prokaryotic cells, meaning they do not have a nucleus. They can be both beneficial and harmful, and they are found everywhere, not limited to specific environments.

Beneficial bacteria are used in the fermentation process to produce yogurt and cheese. These bacteria help in converting milk into these dairy products through the fermentation process.

Certain bacteria can thrive in extreme environments like hot springs due to their ability to withstand high temperatures.

Anton van Leeuwenhoek was the first scientist to observe microorganisms in the 17th century using microscopes. His discoveries laid the foundation for the study of microorganisms and their role in diseases.

Influenza, commonly known as the flu, is caused by viruses. Tuberculosis and cholera are bacterial infections, while athlete's foot is a fungal infection.