Biology past questions: WAEC SSCE 2021

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 mixture of blood with antigen A and blood containing antibody a will?
1. A.lead to agglutination
2. B.facilitate dissolution of clot
3. C.have no effect on blood composition
4. D.change the blood group
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Answer: A lead to agglutination
2.
A plant cell placed in a solution with a higher water potential will
1. A.expand and then shrink
2. B.enlarge and become turgid
3. C.expand and then burst
4. D.decrease in size and become flaccid
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Answer: C expand and then burst
3.
A woman with Rhesus negative blood group was advised not to marry a man with Rhesus positive blood group because
1. A.it will hinder her from having blood transfusion from her husband
2. B.it will result in sickness and probably death of the offspring
3. C.her children may all resemble her husband
4. D.it may affect her childbearing ability
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Answer: B it will result in sickness and probably death of the offspring
4.
An association between living organisms in which one organism lives on and feeds at the expense of the other organism is known as?
1. A.mutualism
2. B.commensalism
3. C.parasitism
4. D.predation
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Answer: C parasitism
5.
An enzyme reaction may begin to decline when?
1. A.the optimum temperature is attained
2. B.the ph of the medium is altered
3. C.there is an increase in substrate concentration
4. D.the atmospheric pressure is altered
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Answer: B the ph of the medium is altered
6.
Autotrophic nutrition is a process whereby an organism obtains food
1. A.by utilizing its store energy
2. B.by synthesizing simple substances using energy
3. C.from other organisms in exchange for some products
4. D.in a synthesized form, from other living organisms
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Answer: B by synthesizing simple substances using energy
7.
Detoxification of urea takes place in the?
1. A.pancreas
2. B.heart
3. C.liver
4. D.testes
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Answer: C liver
8.
Endangered species are organisms that are?
1. A.likely to migrate to other favourable lands
2. B.likely to disappear from the surface of the earth
3. C.reproducing profusely in an area
4. D.dangerous to humans and attacking other animals
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Answer: B likely to disappear from the surface of the earth
9.
How many gametes are produced in the pollen grain of a flowering plant before fertilization?
1. A.one
2. B.two
3. C.three
4. D.four
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Answer: C three
10.
In humans, pointed eyebrows (B) is a dominant trait over smooth eyebrows (b). A student and the mother have smooth eyebrows while the father has pointed eyebrows. What is the genotype of the father?
1. A.BB
2. B.Bb
3. C.bb
4. D.BBbb
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Answer: B Bb
11.
Natural selection arises as a result of?
1. A.gene mutation
2. B.change of habitat
3. C.reduction in population
4. D.climate change
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Answer: A gene mutation
12.
Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because
1. A.greater amount of DNA is involved in sexual reproduction
2. B.gametes of parents have different genetic composition
3. C.genetic materials come from parents of two different species
4. D.sexual reproduction is a lengthy process
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Answer: B gametes of parents have different genetic composition
13.
Plants and animals of an ecosystem make up a?
1. A.habitat
2. B.succession
3. C.community
4. D.population
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Answer: C community
14.
Plants suitable for experiments in genetics must not
1. A.produce numerous seeds within a short time
2. B.have a small number of chromosomes
3. C.have a relatively short life cycle
4. D.produce one generation in a large period
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Answer: D produce one generation in a large period
15.
Rabbits cannot survive in an aquatic habitat because they have
1. A.no scales
2. B.no gills
3. C.fore limbs
4. D.lateral line
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Answer: B no gills
16.
Radius and ulna are bones of the?
1. A.pectoral girdle
2. B.upper arm
3. C.pelvic girdle
4. D.lower arm
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Answer: A pectoral girdle
17.
The blood vessel which carries blood from the alimentary canal to the liver is the?
1. A.hepatic artery
2. B.hepatic vein
3. C.hepatic portal vein
4. D.mesenteric artery
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Answer: C hepatic portal vein
18.
The diagram above is an illustration of a type of eye defect in humans. Study it and answer this question. The eye defect can be corrected by the use of?
1. A.convex lens
2. B.concave lens
3. C.bifocal lens
4. D.cylindrical lens
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Answer: B concave lens
19.
The diagram above is an illustration of a type of eye defect in humans. Study it and answer this question. The eye defect illustrated in the diagram is?
1. A.hypermetropia
2. B.astigmatism
3. C.presbyopia
4. D.myopia
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Answer: D myopia
20.
The diagram above is an illustration of the foot of an animal. The adaptation of this type of foot is that it is?
1. A.used as a bait to catch fish in water
2. B.used as a paddle for swimming
3. C.effective in scratching the soil for food
4. D.used for killing prey in water
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Answer: B used as a paddle for swimming
21.
The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question. The death of the plant was likely caused by?
1. A.excess supply of nutrients to the plant
2. B.inadequate supply of water to the plant
3. C.algal growth in the solution that used up the nutrients
4. D.inability of the plant to make food due to lack of sunlight
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Answer: A excess supply of nutrients to the plant
22.
The diagram above is an illustration of the growth of a plant in a water culture. After a few days, the solution turned green and the plant died. Use this to answer this question. What precaution should have been taken to prevent the solution from turning green?
1. A.use a non-green plant for the experiment
2. B.aerate the solution daily
3. C.cover the culture vessel with opaque paper
4. D.keep cotton wool around the seedling to make it dry
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Answer: C cover the culture vessel with opaque paper
23.
The diagram above is an illustration of the longitudinal section of a mammalian organ. Study it and answer this question. What is the main function of the organ?
1. A.Excretion
2. B.Respiration
3. C.Reproduction
4. D.Locomotion
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Answer: A Excretion
24.
The diagram above is an illustration of the longitudinal section of a mammalian organ. Study it and answer this question. Which of the labeled parts is the cortex?
1. A.I
2. B.II
3. C.III
4. D.IV
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Answer: D IV
25.
The diagram below is an illustration of a Fungus. Study it and answer questions 4 to 6 The structure labeled II is the
1. A.spore
2. B.stolon
3. C.columella
4. D.sporangium
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Answer: D sporangium
26.
The diagrams above are illustrations of types of comb found in domestic fowl. Study them and answer this question. The types of comb show ?
1. A.variation
2. B.inheritance
3. C.cell theory
4. D.courtship behaviour
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Answer: A variation
27.
The diagrams above are illustrations of types of comb found in domestic fowl. Study them and answer this question. Which factor is most likely responsible for the various types of comb?
1. A.environment
2. B.genetics
3. C.physiology
4. D.morphology
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Answer: B genetics
28.
The following organisms are examples of carnivorous plants except.
1. A.gloriosa
2. B.venus flytrap
3. C.pitcher plant
4. D.Utricularia
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Answer: A gloriosa
29.
The fruit that has the illustrated sections is a
1. A.hesperidium
2. B.capsule
3. C.drupe
4. D.cypsela
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Answer: A hesperidium
30.
The illustration below is a food chain. Grass→grasshopper→domestic fowl→hawk What would happen if the population of domestic fowl decreases?
1. A.grasshoppers would decrease
2. B.hawks would increase
3. C.grasshoppers would increase
4. D.grasses available to grasshoppers
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Answer: C grasshoppers would increase
31.
The level of organization of the organism is
1. A.tissue
2. B.cell
3. C.organ
4. D.system
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Answer: B cell
32.
The organism belongs to the Phylum
1. A.Rhizopoda
2. B.Ciliophora
3. C.Euglenophyta
4. D.Rhodophyta
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Answer: C Euglenophyta
33.
The process that takes place at the light stage of photosynthesis is?
1. A.splitting of water molecules to form hydrogen ions
2. B.reduction of carbon (IV) oxide to form carbohydrate
3. C.formation of two molecules of phosphoglyceric acid
4. D.breaking down of ATP molecules to produce energy
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Answer: A splitting of water molecules to form hydrogen ions
34.
The sections in X and Y respectively, are
1. A.longitudinal and transverse
2. B.transverse and longitudinal
3. C.cross and transverse
4. D.transverse and cross
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Answer: D transverse and cross
35.
The structure labelled I is associated with
1. A.sexual reproduction
2. B.asexual reproduction
3. C.bud formation
4. D.gamete formation
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Answer: B asexual reproduction
36.
The temperature control centre in mammals is located in the?
1. A.skin
2. B.hypothalamus
3. C.pituitary gland
4. D.adrenal gland
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Answer: B hypothalamus
37.
When a large number of organisms share limited resources, the result is?
1. A.mutualism
2. B.extinction
3. C.commensalism
4. D.competition
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Answer: D competition
38.
Which of the following behaviours is correctly matched with the corresponding diseases?
1. A.Smoking cigarette / Liver cirrhosis. Lung cancer, AIDS
2. B.Having multiple sexual partners / liver cirrhosis, syphilis, AIDS
3. C.Living near dirty gutter / Lung cancer, syphilis, river blindness
4. D.Eating uncooked meatf/fdysentery, cholera. food poisoning
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Answer: D Eating uncooked meatf/fdysentery, cholera. food poisoning
39.
Which of the following factors is not necessary for photosynthesis?
1. A.water
2. B.carbon (IV) oxide
3. C.wind
4. D.sunlight
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Answer: C wind
40.
Which of the following features is a characteristic of aquatic plants possession of ?
1. A.multiple epidermis
2. B.heavily lignified tissue
3. C.finely divided leaves
4. D.succulent stem
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Answer: D succulent stem
41.
Which of the following hormones is suddenly secreted into the bloodstream of a frightened person?
1. A.insulin
2. B.adrenaline
3. C.thyroxine
4. D.parathormore
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Answer: B adrenaline
42.
Which of the following organelles is common to both plant and animal cells
1. A.Cellulose cell wall
2. B.Chlorophyll
3. C.Cell membrane
4. D.Large vacuole
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Answer: C Cell membrane
43.
Which of the following organisms does not undergo incomplete metamorphosis?
1. A.locust
2. B.grasshopper
3. C.butterfly
4. D.cockroach
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Answer: C butterfly
44.
Which of the following organisms exhibits division of labour?
1. A.butterfly
2. B.cockroach
3. C.termite
4. D.housefly
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Answer: C termite
45.
Which of the following practices is a wildlife conservation method?
1. A.use of cover crops
2. B.crop rotation
3. C.mulching
4. D.discouraging poaching
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Answer: D discouraging poaching
46.
Which of the following resources cannot be conserved?
1. A.forest
2. B.water
3. C.soil
4. D.garbage
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Answer: D garbage
47.
Which of the following statements about mitosis is not correct?
1. A.chiasmata are not formed
2. B.Bi-valents are not formed
3. C.It does not lead to variation
4. D.Four daughter cells are produced
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Answer: D Four daughter cells are produced
48.
Which of the following statements about sickle cell anaemia is correct?
1. A.it is caused by sex-linked genes
2. B.it is more common in males than in females
3. C.two sickle cell carrier parents may have a sickling child
4. D.it is caused by recessive genes
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Answer: C two sickle cell carrier parents may have a sickling child
49.
Which of the following statements about the structure labeled III is correct?
1. A.secretes digestive enzymes into the substrate
2. B.absorbs mineral salts from the soil
3. C.forms the root hairs of the organism
4. D.develops into stolon
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Answer: A secretes digestive enzymes into the substrate
50.
Which of the following statements is not Lamarck's postulate on evolution?
1. A.great changes in the environment result in corresponding changes in species
2. B.frequently used organs become well developed while the ones not used become vestigial
3. C.well developed acquired characters are inheritable
4. D.survivors in a competitive community must have inherited useful traits
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Answer: D survivors in a competitive community must have inherited useful traits

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