SS3 Biology WAEC Questions and Answers 2025

Preparing for the 2025 WAEC Biology exam as an SS3 student can be overwhelming, but with the right guidance, you can excel. Biology, as a core science subject, requires understanding key concepts, practicing past questions, and mastering the WAEC exam format. This article provides SS3 Biology WAEC questions and answers for 2025, tips to tackle the exam, and strategies for achieving excellent results.

Why Is Biology Important for SS3 Students?

Biology is one of the most important science subjects offered in WAEC exams because it is required for students pursuing careers in:

• Medicine
• Pharmacy
• Nursing
• Agriculture
• Biochemistry
• Environmental Science

A good grade in Biology can determine the next step in your educational journey. To succeed, you must prepare effectively by studying the syllabus, practicing past questions, and learning from provided answers.

Understanding the WAEC Biology Exam Format

Before diving into SS3 Biology WAEC questions and answers for 2025, it is important to know the structure of the Biology WAEC exam. Here’s what to expect:

Paper 1: Objective (Multiple Choice)

This section contains 50 multiple-choice questions covering the entire syllabus. Each question has four options (A, B, C, or D), and you are required to select the correct answer.

Paper 2: Theory

This section includes essay-style questions. You will be given several questions with subsections and required to answer a specific number of them.

Paper 3: Practical

The practical paper tests your ability to identify specimens, interpret experimental data, and apply biological principles.

SS3 Biology WAEC Questions and Answers 2025

Below are sample questions and answers tailored to the 2025 WAEC Biology syllabus. These questions are modeled after previous WAEC exams and are intended to help you familiarize yourself with the exam format.

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Biology WAEC Questions: Paper 1 (Objective)

Question 1

Which of the following is NOT a function of the cell membrane?

A. Transport of materials
B. Protection of the cell
C. Production of energy
D. Regulation of substances entering and leaving the cell

Answer: C. Production of energy

Question 2

In mammals, the organ responsible for filtering urea from the blood is the:

A. Liver
B. Kidney
C. Lungs
D. Pancreas

Answer: B. Kidney

Question 3

A green plant placed in a dark room for 48 hours will lose its ability to:

A. Absorb water
B. Photosynthesize
C. Transpire
D. Respire

Answer: B. Photosynthesize

Biology WAEC Questions: Paper 2 (Theory)

Question 1

(a) Define the term osmosis.
(b) Explain three biological examples of osmosis.

Answer:
(a) Osmosis is the movement of water molecules from a region of lower solute concentration to a region of higher solute concentration across a semi-permeable membrane.

(b) Examples:

1. Absorption of water by plant roots: Water moves from the soil into root hair cells through osmosis.
2. Reabsorption in the kidney: Water is reabsorbed from the kidney tubules into the bloodstream by osmosis.
3. Turgor pressure in plant cells: Osmosis causes water to enter plant cells, making them turgid and supporting the plant structure.

Question 2

Using a labeled diagram, describe the structure of the human heart.

Answer:
The human heart is a muscular organ divided into four chambers:

• Two upper chambers: Left atrium and Right atrium
• Two lower chambers: Left ventricle and Right ventricle

Key features of the heart:

1. Valves: Prevent backflow of blood (e.g., tricuspid valve, mitral valve).
2. Septum: Divides the heart into left and right sides.
3. Blood vessels: Include the aorta, pulmonary artery, and veins.

(Labeled diagram should include chambers, valves, and major blood vessels.)

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Biology WAEC Questions: Paper 3 (Practical)

Question 1: Specimen Identification

You are provided with the following specimens:

• Specimen A: Leaf
• Specimen B: Earthworm
• Specimen C: Maize grain

(a) Identify each specimen.
(b) State one function of each specimen in its natural habitat.

Answer:
(a) Identification:

• Specimen A: Leaf
• Specimen B: Earthworm
• Specimen C: Maize grain

(b) Functions:

• Leaf: Photosynthesis to produce food for the plant.
• Earthworm: Aerates the soil and improves soil fertility.
• Maize grain: Germinates to produce a maize plant.

How to Prepare for SS3 Biology WAEC Exam 2025

To excel in your Biology WAEC exam, follow these preparation tips:

1. Study the WAEC Syllabus

Download the official WAEC Biology syllabus and ensure you cover all topics, including:

• Ecology
• Genetics
• Respiration
• Photosynthesis
• Reproduction

2. Practice Past Questions

Past questions help you understand the exam format and frequently asked questions. Practice at least 5 years’ worth of past questions.

3. Master Practical Skills

The practical aspect of Biology is crucial. Learn to identify specimens, draw diagrams, and understand biological experiments.

4. Join Study Groups

Study groups can help you clarify difficult concepts and stay motivated.

5. Use Recommended Textbooks

Some reliable Biology textbooks include:

• Modern Biology by S.T. Ramalingam
• Essential Biology by M.C. Michael

Frequently Asked Questions (FAQs)

1. What Topics Should I Focus on for the 2025 WAEC Biology Exam?

Key topics include:

• Photosynthesis
• Reproduction in plants and animals
• The circulatory system
• Genetics and heredity
• Ecology

2. Are Past Questions Enough to Pass WAEC Biology?

Past questions are essential but not enough. Combine them with studying the syllabus, attending classes, and practicing practicals.

3. How Can I Improve My Biology Practical Skills?

• Attend practical classes in school.
• Practice drawing and labeling diagrams.
• Study the functions of biological specimens.

4. What Is the Grading System for WAEC Biology?

WAEC grades range from A1 (Excellent) to F9 (Fail). Aim for A1 by preparing thoroughly.

5. When Is the 2025 WAEC Biology Exam Scheduled?

The exact date will be included in the official WAEC timetable, which can be accessed on the WAEC portal.

Final Thoughts

Preparing for the SS3 Biology WAEC exam in 2025 requires dedication, focus, and the right resources. By practicing SS3 Biology WAEC questions and answers for 2025 and following the tips in this guide, you’ll be well on your way to achieving an excellent result.

Stay consistent, revise regularly, and don’t forget to practice your practical skills. Good luck!