Microorganisms

What is the main purpose of microorganisms in nature?

• Both to benefit and harm larger organisms

• To make food for themselves

• To benefit larger organisms

• To harm larger organisms

Which of the following is a beneficial microorganism?

• E. coli in contaminated food

• Yeast used in bread making

• Viruses causing diseases

• Bacteria causing tooth decay

How can some microorganisms be harmful?

• By decomposing dead organisms

• By causing diseases

• By helping in digestion

• By producing oxygen

What role do beneficial microorganisms play in agriculture?

• Destroying crops

• Polluting water

• Helping plants absorb nutrients

• Causing plant diseases

Which microorganism is used to make antibiotics?

• Disease-causing fungi

• Harmful viruses

• Certain bacteria

• Weed plants

Why is it important to wash hands properly?

• To make them look clean

• To remove harmful microorganisms

• To make them soft

• To keep them warm

What is fermentation and which microorganism is involved?

• A method to purify air, involving fungi

• A cooking technique, involving bacteria

• A process to clean water, involving algae

• A process to make bread rise, involving yeast

How do microorganisms help in the human digestive system?

• By causing infections

• By breaking down food

• By making food taste better

• By cooling the stomach

Which of the following is NOT a benefit of microorganisms?

• Causing food poisoning

• Making vitamins in the human gut

• Cleaning up oil spills

• Producing oxygen through photosynthesis

What is the role of microorganisms in the nitrogen cycle?

• They block nitrogen from reaching the soil

• They consume all the nitrogen, leaving none for plants

• They increase nitrogen in the atmosphere

• They convert nitrogen into a form plants can use