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NABTEB Biology Past Questions and Answers.

Published on Aug 22, 2025 • Education

Introduction

Hello everyone, welcome to today’s class! My name is Adebanke, and I’ll be taking you through some NABTEB Biology past questions with detailed explanations. These solutions will also be helpful if you’re preparing for WAEC or JAMB Biology exams.

Let’s get started with the questions and answers.

Question 1 – What is Osmosis?

The first question says: What is osmosis?

Correct Definition

Osmosis is the movement of water molecules from a region of lower concentration to a region of higher concentration through a semi-permeable membrane.

Options Given

A. Movement of salt from high to low concentration
B. Movement of water across a semi-permeable membrane
C. Movement of gases into cells
D. Absorption of nutrients by the root hairs

Correct Answer: B. Movement of water across a semi-permeable membrane

Explanation

• Osmosis involves water only, not salts or gases.
• The membrane must be semi-permeable, meaning it allows only certain molecules (like water) to pass through.
• This process is vital for maintaining balance in plant and animal cells, ensuring proper hydration and nutrient absorption.

Real-Life Examples of Osmosis

• Movement of water into plant roots from the soil.
• Preservation of food in concentrated sugar or salt solutions (which draw water out of microbes by osmosis).
• Swelling of red blood cells when placed in distilled water.

Exam Tip

In NABTEB and WAEC Biology exams, always state that osmosis is the movement of water molecules only through a semi-permeable membrane. Many students lose marks by leaving out either of these key terms.

Watch the full tutorial here: https://www.youtube.com/watch?v=bce8W7g1akU&t=92s

Conclusion

Osmosis is one of the most important transport processes in Biology. It plays a vital role in plants, animals, and everyday applications like food preservation. Understanding it thoroughly will help you answer related questions in NABTEB, WAEC, and JAMB Biology exams with confidence.

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• NABTEB Physics Past Questions with Solutions
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