Biology past questions: WAEC SSCE 2025

50 objective questions, with answers. Free to read and practise.

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50 questions, one at a time, marked as you go or at the end. No account needed.

1.
A couple heterozygous for albino genes have normal skin colour. What is the probability that their child would be an albino?
1. A.\(\frac{1}{2}\)
2. B.\(\frac{1}{3}\)
3. C.\(\frac{1}{4}\)
4. D.1
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Answer: C \(\frac{1}{4}\)
2.
Alleles are found on
1. A.nucleus
2. B.nucleolus
3. C.chromosomes
4. D.tissues
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Answer: C chromosomes
3.
An important characteristics of fruits dispersed by water is the presence of
1. A.fibrous covering
2. B.smooth surface
3. C.water content
4. D.pericarp
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Answer: A fibrous covering
4.
Chemical digestion in organisms is the
1. A.breakdown of starch into carbohydrates
2. B.breakdown of complex molecules into simple molecules
3. C.build up of simple insoluble molecules
4. D.build up of simple soluble molecules into complex insoluble molecules
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Answer: B breakdown of complex molecules into simple molecules
5.
During the process of hearing in mammals, the structure in the middle ear which receives the first vibration is the
1. A.oval window
2. B.round window
3. C.incus
4. D.malleus
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Answer: D malleus
6.
Excessive bleeding from an injury could be due to the lack of vitamin
1. A.K
2. B.E
3. C.B
4. D.A
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Answer: A K
7.
Four cells each with osmotic potential of about 3% salt solution was immersed respectively into solutions of different concentrations as follows: I - 1% salt solution; II - 3% salt solution; III - 6% salt solutuon; IV - 10% salt solution. If the cells are plant cells, what would happen to the cell in solution III? It would become
1. A.turgid
2. B.crenated
3. C.haemolysed
4. D.plasmolyzed
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Answer: D plasmolyzed
8.
Four cells each with osmotic potential of about 3% salt solution was immersed respectively into solutions of different concentrations as follows: I - 1% salt solution; II - 3% salt solution; III - 6% salt solutuon; IV - 10% salt solution. Which of the solutions will cause an increase in osmotic pressure within the cell?
1. A.I
2. B.II
3. C.III
4. D.IV
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Answer: A I
9.
How many molecules of oxygen are required for the aerobic respiration of three molecules of glucose?
1. A.3
2. B.6
3. C.12
4. D.18
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Answer: D 18
10.
If the percentage of adenine in the DNA of a human is 32%, what would be the percentage of thymine?
1. A.10%
2. B.16%
3. C.32%
4. D.27%
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Answer: C 32%
11.
If the small intestine of an organism does not have villi, the organism will have a problem with
1. A.digestion of food only
2. B.absorption of water
3. C.absorption of nutrients only
4. D.digestion of food and absorption of nutrients
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Answer: C absorption of nutrients only
12.
Lamarck's theory of evolution states that
1. A.characteristics of organisms are not the sum of the characters of their parents
2. B.characteristics of organisms are determined by mutation
3. C.organisms transfer acquired characters to their offspring
4. D.organism acquire genes from their parents
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Answer: C organisms transfer acquired characters to their offspring
13.
Long sightedness could be corrected using a
1. A.biconvex lens
2. B.convex lens
3. C.biconcave lens
4. D.concave lens
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Answer: B convex lens
14.
Plants which grow and produce fruits within a year are called
1. A.biennials
2. B.perennials
3. C.annuals
4. D.herbs
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Answer: C annuals
15.
Sclerenchyma tissues in plants is for
1. A.water conduction
2. B.mechanical support
3. C.food storage
4. D.food transport
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Answer: B mechanical support
16.
The ability of some individuals to taste phenylthiocarbamide is
1. A.morphological variation
2. B.physiological variation
3. C.morphological adaptation
4. D.physiological adaptation
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Answer: B physiological variation
17.
The castes of the organisms found in a beehive are
1. A.drones, queen and workers
2. B.workers, soldiers and reproductives
3. C.soldiers, workers and king
4. D.king, queen and soldiers
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Answer: A drones, queen and workers
18.
The diagram above is an illustration of a cell carrying out a biological process. Study it and answer the question below: The biological system that contains cells that carry out the illustrated biological processes in humans is
1. A.reproduction
2. B.circulatory
3. C.respiratory
4. D.nervous
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Answer: B circulatory
19.
The diagram above is an illustration of a cell carrying out a biological process. Study it and answer the question below: The process is referred to as
1. A.phagocytosis
2. B.pinocytosis
3. C.endocytosis
4. D.exocytosis
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Answer: A phagocytosis
20.
The diagram above is an illustration of a dicot leaf. Study it and answer the question below. The part that contains the phloem and xylem is labelled
1. A.I
2. B.II
3. C.III
4. D.IV
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Answer: B II
21.
The diagram above is an illustration of a dicot leaf. Study it and answer the question below. The parts labelled I,II,III and IV respectively are
1. A.vein, apex, midrib, stalk
2. B.midrib, petiole, margin, stalk
3. C.apex, lamina, blade, axil
4. D.apex, midrib, lamina, axil
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Answer: A vein, apex, midrib, stalk
22.
The diagram above is an illustration of a system in humans. Study it and answer the question below. Enzymatic digestion of protein begins in the part labelled
1. A.I
2. B.II
3. C.III
4. D.IV
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Answer: A I
23.
The diagram above is an illustration of an ecological instrument used in a habitat. Study it and answer question below. The ecological instrument is
1. A.wind vane
2. B.six's thermometer
3. C.secchi disc
4. D.hygrometer
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Answer: C secchi disc
24.
The diagram above is an illustration of an ecological instrument used in a habitat. Study it and answer question below. The instrument is used to measure a factor
1. A.in the atmosphere
2. B.in water
3. C.on land
4. D.on grass
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Answer: B in water
25.
The diagram above is an illustration of the nymph of an insect. Study it and answer the question below: The growth process that would occur in the organism before it becomes an adult is
1. A.respiration
2. B.locomotion
3. C.moulting
4. D.sensitivity
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Answer: C moulting
26.
The diagram above is an illustration of the nymph of an insect. Study it and answer the question below: The organism illustrated is a stage in the
1. A.grasshopper
2. B.mosquito
3. C.termite
4. D.cockroach
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Answer: D cockroach
27.
The diagram below is an illustration of a system in humans. Study it and answer the question below. The parts that secret substances involved in the digestion of fats are labelled
1. A.I, II and III
2. B.I and III
3. C.II and III
4. D.I, III and IV
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Answer: C II and III
28.
The following ecological factors affect all habitat except
1. A.temperature
2. B.humidity
3. C.light
4. D.pressure
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Answer: B humidity
29.
The functions of vacuoles in plants are storage and
1. A.protection
2. B.strength
3. C.support
4. D.sensitivity
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Answer: C support
30.
The Genus into which man is classified is
1. A.Chordata
2. B.mammalia
3. C.homo
4. D.sapiens
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Answer: C homo
31.
The main effect of a deforestation is
1. A.creation of new habitats
2. B.loss of soil particles
3. C.survival of more species
4. D.reduction of carbon(IV) oxide in the atmosphere
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Answer: B loss of soil particles
32.
The naturally produced auxin in plants is
1. A.Indole acetic acid
2. B.dichlorophenoxyacetic acid
3. C.aldone
4. D.florigen
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Answer: A Indole acetic acid
33.
The process occuring in the illustrated molecules above is
1. A.protein synthesis
2. B.gene coding
3. C.DNA replication
4. D.gene mutation
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Answer: C DNA replication
34.
The relationship between a bean plant and a Tridax plant on a farmland is
1. A.competition
2. B.predation
3. C.parasitism
4. D.epiphytism
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Answer: A competition
35.
The sympathetic nervous system causes
1. A.constriction of the arteries
2. B.heartbeat to slow down
3. C.increase in the secretion of saliva
4. D.contraction of the bladder
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Answer: A constriction of the arteries
36.
The theory of natural selection in evolution was formulated by
1. A.Mathias Schleiden
2. B.Louis Pasteur
3. C.Charles Darwin
4. D.Jean Lamarck
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Answer: C Charles Darwin
37.
Urine when compared with blood in mammals is hypertonic because
1. A.urine contains high percentage of all cells
2. B.all traces of sugar have been removed from urine
3. C.urea is actively secreted into the renal tubules
4. D.much water has been removed from urine
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Answer: D much water has been removed from urine
38.
What is the population density of Ageratum sp. of frequency 1,850 on a land area measuring 100m \(^2\) ?
1. A.18.50/m \(^2\)
2. B.18.05/m \(^2\)
3. C.0.50/m \(^2\)
4. D.0.05/m \(^2\)
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Answer: A 18.50/m \(^2\)
39.
When Tilapias' population in a pond reaches the carrying capacity, the population
1. A.alternatively increases and decreases
2. B.remains unchanged
3. C.increases only
4. D.decreases only
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Answer: A alternatively increases and decreases
40.
Which of the following activities does not control pathogens?
1. A.exposure to ultraviolet radiation
2. B.use of disinfectants
3. C.eating balanced diets
4. D.destroying the habitats of pathogens
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Answer: C eating balanced diets
41.
Which of the following activities is not suitable for forest conservation?
1. A.felling of trees
2. B.planting seedlings
3. C.preventing bush fires
4. D.preventing tree crops
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Answer: A felling of trees
42.
Which of the following diseases could be prevented by a BCG vaccination?
1. A.Malaria
2. B.Cholera
3. C.Tuberculosis
4. D.Diphtheria
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Answer: C Tuberculosis
43.
Which of the following pairs of features is an example of discontinuous variation?
1. A.height and blood group
2. B.height and sex
3. C.colour and weight
4. D.fingerprint and blood group
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Answer: D fingerprint and blood group
44.
Which of the following resources cannot be conserved?
1. A.mineral resources
2. B.soil and water
3. C.forest and wildlife
4. D.domestic wastes
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Answer: D domestic wastes
45.
Which of the following sequences represents the trend in eutrophication?
1. A.Heavy mineralization→ lack of oxygen→ massive algal growth
2. B.Excessive nitrates→ massive algal growth →lack of oxygen→death of aquatic organisms
3. C.Excessive phosphates→lack of oxygen→massive algal growth→ death of aquatic organisms
4. D.massive algal growth→excessive nitrates→lack of oxygen
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Answer: B Excessive nitrates→ massive algal growth →lack of oxygen→death of aquatic organisms
46.
Which of the following statements about the pyramid of energy is correct?
1. A.Energy remains constant across trophic levels
2. B.Energy decreases from the base to the apex of the pyramid
3. C.Energy increases from the base to the apex of the pyramid
4. D.each trophic level is an independent energy source
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Answer: B Energy decreases from the base to the apex of the pyramid
47.
Which of the following statements correctly describes the term population? The number of
1. A.Tilapia in a lake
2. B.fungus and snail on leaf litter
3. C.bees and butterflies on a flower
4. D.flatworms and roundworms in the gut of an animal
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Answer: A Tilapia in a lake
48.
Which of the following statements is not correct about colour blindness?
1. A.It is a sex-linked trait
2. B.Males are often carriers
3. C.females are not carriers
4. D.The trait is controlled by a recesive gene
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Answer: C females are not carriers
49.
Which of the following statements is not correct about respiration in plants?
1. A.It occurs in all plant tissues
2. B.Light and chlorophyll must be present for it to occur
3. C.Energy is produced as the end product
4. D.It occurs in the presence of oxygen
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Answer: B Light and chlorophyll must be present for it to occur
50.
Which of the following statements is not correct about the dental formula of humans?
1. A.One pair of canines is on the upper jaw and three pairs of premolars are on the lower jaw
2. B.Two pairs of incisors are the upper jaw and three pairs of premolars are on the lower jaw
3. C.Two pairs of incisors are on the upper jaw and three pairs of molars are on the lower jaw
4. D.One pair of canines is on the upper jaw and four pairs of molars are on the lower jaw
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Answer: C Two pairs of incisors are on the upper jaw and three pairs of molars are on the lower jaw

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