As you prepare for the NECO Biology exam in 2025/2026, it’s essential to know the most repeated topics, questions, and answers in NECO Biology. Understanding these commonly tested areas will help you focus better, revise effectively, and score high marks with confidence.
In this post, I’ll be showing you the most repeated NECO Biology topics, questions, and answers for the 2025/2026 exam. If you’ve been asking yourself questions like:
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Why Study the Most Repeated NECO Biology Topics and Questions?
Biology is a key science subject that tests your knowledge of life and living organisms. NECO Biology covers a wide range of topics — but the truth is, NECO repeats questions regularly, especially in areas like reproduction, classification, and ecological relationships.
By studying the most repeated Biology topics and questions, you will:
Focus on high-yield areas
Answer more questions correctly and quickly
Save time during revision
Become familiar with NECO's question patterns
Increase your confidence and chances of success
Let’s now explore the Biology topics NECO loves to test.
Most Repeated NECO Biology Topics (2025/2026)
These are the 15 most common topics that appear almost every year in NECO Biology:
1. Cell and Its Environment
Cell structure and functions
Differences between plant and animal cells
2. Classification of Living Things
Kingdoms, phyla, and classes
Binomial nomenclature
Differences between vertebrates and invertebrates
3. Nutrition in Plants and Animals
Photosynthesis and mineral nutrition
Heterotrophic nutrition
Enzymes and their functions
4. Transport System
Circulatory system in humans
Transportation in plants (xylem, phloem)
5. Respiration
Aerobic vs anaerobic respiration
Energy production in cells
6. Excretion and Homeostasis
Organs of excretion
Homeostatic control (e.g., body temperature, blood sugar)
7. Reproduction
Asexual and sexual reproduction
Reproductive systems in humans
Pollination and fertilization in plants
8. Growth and Development
Growth patterns in humans and plants
Factors affecting growth
9. Coordination and Sense Organs
Nervous and endocrine systems
Structure and function of the eye and ear
10. Ecology
Food chains and food webs
Energy flow and nutrient cycles
Ecosystem and environmental balance
11. Evolution and Adaptation
Natural selection
Structural, behavioral, and physiological adaptations
12. Genetics
Mendelian inheritance
Genotype and phenotype
Genetic crosses and interpretation
13. Variation
Types of variation (continuous and discontinuous)
Causes and significance of variation
14. Health and Disease
Causes, prevention, and control of common diseases
Personal hygiene and public health
15. Economic Importance of Plants and Animals
Useful and harmful plants/animals
Agricultural biology and pest control
Most Repeated NECO Biology Questions (2025/2026)
Here are frequently repeated Biology questions to guide your revision:
Define a cell and list two differences between plant and animal cells.
What is photosynthesis? State its balanced chemical equation.
List four characteristics used in classifying living organisms.
State three differences between arteries and veins.
Explain aerobic respiration and write its word equation.
List two excretory organs in humans and state their functions.
Differentiate between pollination and fertilization.
State five functions of the skeleton in vertebrates.
What is a food web? Draw a simple food web involving four organisms.
Explain the concept of natural selection as proposed by Darwin.
Draw and label the structure of the human eye.
Use a genetic cross to determine the offspring from two heterozygous parents.
Define variation and list two causes of variation.
State three ways diseases can be prevented in a community.
Mention five economic uses of maize or cassava.
👉 Click here to access NECO Biology past questions and answers (PDF)
Study Tips to Use NECO Biology Questions and Topics Effectively
Here are powerful tips to help you master NECO Biology:
✅ Use Diagrams to Understand
Draw and label diagrams like the heart, kidney, flower, and eye. NECO loves diagram-based questions.
✅ Read with the Syllabus
Use the NECO Biology syllabus to track your progress and ensure coverage.
✅ Practice Past Questions
Solve past theory and objective questions topic by topic. Focus on repeated ones.
✅ Summarize Each Topic
After reading a topic, write short notes in your own words — this helps retention.
✅ Teach Others or Join Study Groups
Explaining concepts to others helps you understand them better.
✅ Practice with Flashcards
Use flashcards to memorize scientific terms, definitions, and classifications.
❓FAQ – Most Repeated NECO Biology Topics, Questions and Answers
1. Does NECO repeat Biology questions?
Yes. NECO repeats both theory and objective questions, especially in reproduction, classification, and genetics.
2. What are the most repeated topics in NECO Biology?
Reproduction, cell structure, ecology, photosynthesis, and classification are top recurring topics.
3. Can I pass Biology by using only past questions?
Past questions help a lot, but you also need to understand key concepts and diagrams.
4. How many papers are in NECO Biology?
There are usually two:
Paper 1: Objectives (60 questions)
Paper 2: Essay/Theory (drawings, explanations, definitions)
5. Are diagrams important in NECO Biology?
Yes. NECO frequently asks students to draw and label structures like the leaf, eye, heart, kidney, and root.
6. Can I use WAEC past questions to study for NECO Biology?
Yes. NECO and WAEC share the same syllabus and question style.
7. What is the best way to study NECO Biology?
Read with understanding, draw diagrams, answer past questions, and explain topics out loud.
8. When should I start preparing for NECO Biology?
Start 3–4 months before the exam for proper coverage and retention.
9. How can I remember all the scientific terms?
Use flashcards, mnemonics, or memory tricks like acronyms to recall key terms.
10. Is NECO Biology practical-based?
There is usually no separate practical paper, but some diagram-based theory questions cover practical topics.
✅ Conclusion
NECO Biology becomes much easier when you focus on the most repeated topics and master past questions. With diagrams, definitions, and understanding of life processes, you’ll perform excellently in both theory and objectives.