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Biology Theory Questions and Answers.

Published on Aug 26, 2025 • Education

Hello everyone. You are welcome to today’s class. My name is Adebanke. We’ll be taking a look at NABTEB biology theory questions. We will discuss the answers as we go through the questions.

Let’s get started with the questions and answers.

Question One: Beneficial Uses of Bacteria

Mention 5 Beneficial uses of Bacteria

Bacteria can be harmful, but many species remain beneficial.

1. Bacteria break down dead organic material, enriching the soil with nutrients that support plant growth.
2. They play a role in the production of compost manure.
3. Nitrogen-fixing bacteria convert atmospheric nitrogen into nitrates through ammonia and nitrites, improving soil fertility.
4. Some bacteria help in vinegar production from alcohol.
5. Bacteria are involved in leather tanning processes.

Question Two: Where Viruses and Bacteria Can Be Found

Viruses may be found in air, soil, and water.

Bacteria, known to be ubiquitous, can be found everywhere—in the air, soil, water, and even inside the human body.

Watch the full tutorial here: https://www.youtube.com/watch?v=olnF_e3s2_U

Conclusion

Biology theory questions often focus on the role of microorganisms such as bacteria and viruses. While bacteria can cause diseases, they also play crucial roles in soil enrichment, food production, and nitrogen fixation. Viruses, though harmful, help students understand the complexity of life at the microscopic level. By studying these biology theory questions and their answers, students gain a clear understanding of how microorganisms affect the environment, human health, and industry. Regular practice with past questions improves confidence, sharpens memory, and ensures excellent performance in exams.

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Keywords

• Biology theory questions and answers
• Beneficial uses of bacteria
• Nitrogen fixing bacteria
• Where viruses can be found
• Where bacteria can be found