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Biology
WAEC / WASSCE 2021
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
An association between living organisms in which one organism lives on and feeds at the expense of the other organism is known as?
A
mutualism
B
commensalism
C
parasitism
D
predation
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #62387)
Biology
WAEC / WASSCE 2021
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
When a large number of organisms share limited resources, the result is?
A
mutualism
B
extinction
C
commensalism
D
competition
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #62388)
Biology
WAEC / WASSCE 2021
Growth, Micro-organisms & Public Health
Which of the following behaviours is correctly matched with the corresponding diseases?
A
Smoking cigarette / Liver cirrhosis. Lung cancer, AIDS
B
Having multiple sexual partners / liver cirrhosis, syphilis, AIDS.
C
Living near dirty gutter / Lung cancer, syphilis, river blindness.
D
Eating uncooked meatf/fdysentery, cholera. food poisoning.
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #62389)
Biology
WAEC / WASSCE 2021
Variety of Organisms & Classification of Living Things
Endangered species are organisms that are?
A
likely to migrate to other favourable lands
B
likely to disappear from the surface of the earth
C
reproducing profusely in an area
D
dangerous to humans and attacking other animals
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #62390)
Biology
WAEC / WASSCE 2021
Population Ecology, Habitats & Conservation
Which of the following practices is a wildlife conservation method?
A
use of cover crops
B
crop rotation
C
mulching
D
discouraging poaching
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #62391)
Biology
WAEC / WASSCE 2021
Variety of Organisms & Classification of Living Things
Which of the following resources cannot be conserved?
A
forest
B
water
C
soil
D
garbage
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #62392)
Biology
WAEC / WASSCE 2021
Variation & Genetics (Heredity)
Which of the following statements about sickle cell anaemia is correct?
A
it is caused by sex-linked genes
B
it is more common in males than in females
C
two sickle cell carrier parents may have a sickling child
D
it is caused by recessive genes
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #62398)
Biology
WAEC / WASSCE 2021
Variation & Genetics (Heredity)
Solution
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?
A
BB
B
Bb
C
bb
D
BBbb
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The father is heterogeneous pointed eyebrows Bb
Source: Myschool Past Questions Archive (Record #62399)
Biology
WAEC / WASSCE 2021
Variation & Genetics (Heredity)
Solution
A woman with Rhesus negative blood group was advised not to marry a man with Rhesus positive blood group because
A
it will hinder her from having blood transfusion from her husband
B
it will result in sickness and probably death of the offspring
C
her children may all resemble her husband
D
it may affect her childbearing ability
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Rh factor is a protein found in blood. A person with Rh factor in blood is called Rh positive whereas one who does not carry this protein in the blood is called Rh negative. Marriage should be avoided between Rh-negative females & Rh-positive males. This can be fatal for the mother as well as the baby of such parents. (second pregnancy may result in erythroblastosis fetalis if necessary precautions are not taken).
Source: Myschool Past Questions Archive (Record #62400)
Biology
WAEC / WASSCE 2021
Adaptation & Evolution
Which of the following organisms exhibits division of labour?
A
butterfly
B
cockroach
C
termite
D
housefly
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #62401)
Biology
WAEC / WASSCE 2021
Adaptation & Evolution
Solution
Natural selection arises as a result of?
A
gene mutation
B
change of habitat
C
reduction in population
D
climate change
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Natural selection is the result of genetic variation, environmental pressures, and competition for resources.
Genetic variation as a result of the following:
Mutations: Create new genotypes
Sexual reproduction: Increases genetic variation
Heritable traits: Passed from parent to offspring
Source: Myschool Past Questions Archive (Record #62402)
Biology
WAEC / WASSCE 2021
Adaptation & Evolution
Which of the following statements is not Lamarck's postulate on evolution?
A
great changes in the environment result in corresponding changes in species
B
frequently used organs become well developed while the ones not used become vestigial
C
well developed acquired characters are inheritable
D
survivors in a competitive community must have inherited useful traits
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #62403)
Biology
WAEC / WASSCE 2021
Transport System in Plants & Animals
Solution
A sample of human blood was put in a test tube and allowed to spin in a centrifuge. The components of the blood sample were clearly separated.
(a) List the four main components of blood that would be in the test tube.
(b) Name the component of the blood that: (i) would form the top layer in the test tube, (ii) destroys pathogens; (iii) is biconcave in shape (iv) would be relatively low in a haemophilic condition (v) is produced in the bone marrow: (vi) is a thrombocyte; (vii) is nucleated.
(c) Mention three chemical substances transported by the blood component named in 1(b)(i).
(d) List four diseases associated with blood.
(e) Explain briefly why a disease of the blood could be dangerous.
medium Difficulty
Verified Correct Answer: Option
Biological Concept & Syllabus Guide
(a) Components of Blood: -(Blood) Plasma-Platelets(Thrombocytes) - White blood cells/Leucocytes - Red blood cells/erythrocytes.
(b) Name or Component of Blood that: (i) forms top layer in the test tube: (Blood) Plasma. (ii) Destroys Pathogens: White Blood Cells/Leucocytes (iii) Is Biconcave in shape: Red Blood Cells/Erythrocytes (iv) Would be relatively low in a Haemophilic condition: Platelets(Thrombocytes) (v) is produced in the bone marrow: - platelets (thrombocytes); - white blood cells/Erythrocytes; - Red blood cells/leucocytes cells/erythrocytes. (vi) Is a Thrombocyte: Platelets (vii) Is Nucleated: White Blood Cells/Leucocytes.
(c) Chemical Substances Transported by the Blood Component Named in 1(b)(i) Blood Plasma: -Thyroxine/Adrenaline/Insulin/Progesterone/Hormones. (Digested) food substances/Nutrients/Glucose Amino acids/Any correctly named digested food substances.-Antibodies/Antigens. -Oxygen/carbon(IV) oxide/dissolved gases.-Toxins -Mineral salts/salt /magnesium/copper/potassium/zinc -Urea/uric acid -Water -Vitamins
(d) Diseases Associated with Blood: -Anaemia/Anemia -Hepatitis -Sickle cell anaemia leukemia Luekaemia/Blood cancer.
(e) Reason a Disease that Attacks the Blood is Deadly: -The blood circulates throughout the body/it is a medium of transportation in the body.-It makes contact with major organs of the body and makes it easy for a disease to be deadly. -Blood disease could attack any component of blood and threatens life.
Source: Myschool Past Questions Archive (Record #62404)
Biology
WAEC / WASSCE 2021
Digestive System & Feeding Mechanisms
Solution
(a) What is dentition in animals?
(b) Describe briefly the generalised structure of a tooth in animals.
(c) List three food substances that plants manufacture from glucose.
(d) Make a diagram, 6 cm to 8 cm long of an experimental set-up to show that oxygen is produced during photosynthesis.
medium Difficulty
Verified Correct Answer: Option
Biological Concept & Syllabus Guide
(a) Dentition In Animals: Is the type/shapes, number, and arrangement of teeth in the mouth/jaws of animals
(b) Description of the Generalised Structure of a Tooth in Animals: -The tooth is made up of a crown. neck and root. -The visible part of the tooth in the crown. -And is covered by the hardest substances/enamel -The neck of the tooth is surrounded by the gum. -While the root is embedded in the jawbone. -Beneath the enamel is the hard dentine. -Which forms the bulk of the tooth in the pulp cavity. -Containing sensory endings of nerves/blood capillaries. -The cement/periodontal membrane covers the root of the tooth in the jawbone.
(c) Food Substances that Plants Manufacture from Glucose:-Sucrose/maltose-Starch -Cellulose -Oil-Proteins
(d) Diagram of an Experiment that Shows that Oxygen is Produced During Photosynthesis
Source: Myschool Past Questions Archive (Record #62405)
Biology
WAEC / WASSCE 2021
Basic Ecological Concepts, Ecosystems & Biomes
Solution
(a) Complete the table below by placing each of the following organisms under the appropriate heading: Algae, Bacteria, Dog, Water lettuce, Tadpole, Cat, Lemna, Waterleaf, Mucor, Mushroom
(b)(i) Name four products of decomposition (ii) Mention three roles of decomposers on a refuse dump
(c) List three materials found in a refuse dump which would not be affected by the action of decomposers.
medium Difficulty
Verified Correct Answer: Option
Biological Concept & Syllabus Guide
(a)
(b)(i) Products of Decomposition: Hydrogen sulphide;-Carbon(IV) oxide; -Methane; -Ammonia; -Water vapour/water;-Mineral salt/plant nutrients;-Heat/energy;-Humus.
(ii) Roles of Decomposer on Refuse Dump:-They feed on dead/decaying organisms, -They form a link in a food chain; -They form a link between biotic and abiotic factors in ecosystem; materials; -They release inorganic components from organic materials; - they facilitate the recycling of nutrients in the ecosystem; -They reduce the bulky nature of the debris/dump.
(c) Materials in a Refuse Dump that would not be Affected by the Action of Decomposers: -Plastics; -Metals/iron/tin/zinc/aluminium; -Glass/bottle -Nylon/polyethene; -Rubber/tyres,-Stones; Ceramics.
Source: Myschool Past Questions Archive (Record #62406)