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Biology for the WAEC Exam
WAEC Biology is required for medicine, nursing, agriculture, and life science admissions across West Africa. The syllabus covers cell structure, genetics and heredity, ecology, evolution, and human systems. Practical skills (microscopy, dissection, biological drawings) are tested in Paper 3.
Locale-specific study guides
Pass-rate data, regulatory context, and study tips for Biology all change by candidate locale. Pick your context:
Common failure modes
These are the patterns that cause most candidates to lose marks on this topic. Recognising them in advance is half the work.
- !Drawing incomplete biological specimens without labels and magnification
- !Confusing convergent and divergent evolution examples
- !Misidentifying nutrient deficiency symptoms in plants
Study tips
- 1Practice biological drawings of onion cells, blood cells, leaf cross-sections, and insect specimens.
- 2Master Mendel's laws: Law of Segregation and Law of Independent Assortment with Punnett squares.
- 3Memorize the food chains, food webs, and pyramid diagrams for common WAEC ecosystems.
Sample WAEC Biology questions
These sample items mirror the format and difficulty of real WAEC questions. Practice with thousands more on the free Koydo question bank.
- 1
In a monohybrid cross between two heterozygous parents (Aa × Aa), the phenotypic ratio of the offspring is:
- A1:2:1
- B3:1Correct
- C1:1
- D2:1:1
Why this answer?
From Aa × Aa, the genotypic ratio is 1AA : 2Aa : 1aa. Since A is dominant over a, both AA and Aa show the dominant phenotype, while aa shows the recessive. The phenotypic ratio is 3 dominant : 1 recessive = 3:1.
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