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Biology
WAEC / WASSCE 2013
Variation & Genetics (Heredity)
The gene that is only located on X-choromosome is said to be
A
expressed in females only
B
defective
C
sex-linked
D
expressed in males only
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 #35821)
Biology
WAEC / WASSCE 2013
Variation & Genetics (Heredity)
If a boy has blood type O and his mother has blood type A,what is the genotype of his father?
A
BB
B
AA
C
AO
D
AB
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 #35822)
Biology
WAEC / WASSCE 2013
Variation & Genetics (Heredity)
A man's who suffers from haemophilia marries a woman who is a carrier, what percentage of their children are likely to be haemophilie?
A
25%
B
50%
C
75%
D
100%
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 #35823)
Biology
WAEC / WASSCE 2013
Variation & Genetics (Heredity)
Solution
Which of the following traits may be considered in marriage counseling?
A
Height
B
Fingerprints
C
Rhesus factor
D
Colour of skin
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Rhesus factor (Rh factor) incompatibility can be a relevant topic in marriage counseling, particularly for couples planning to have children, as it can impact pregnancy outcomes and require specific medical interventions.
The Rh factor is a protein found on the surface of red blood cells, and individuals are either Rh positive (have the protein) or Rh negative (do not have the protein).
Rh incompatibility occurs when a Rh-negative woman is carrying a Rh-positive fetus. The mother's immune system can develop antibodies against the Rh-positive fetal blood cells, which can lead to complications in future pregnancies.
Source: Myschool Past Questions Archive (Record #35824)
Biology
WAEC / WASSCE 2013
Cell Structure, Organization & Cell Division
Which of the following structures is only formed during cell division in animal cells?
A
Cell memberane
B
Cytoplasm
C
Centrosome
D
Ribosome
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 #35825)
Biology
WAEC / WASSCE 2013
Adaptation & Evolution
The function of the drone in a colony of bees is to
A
clean the cells
B
mate with the queen
C
protect the colony
D
lay eggs
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 #35826)
Biology
WAEC / WASSCE 2013
Population Ecology, Habitats & Conservation
Which of the following features is used by chameleons to escape predation?
A
fearsome appearance
B
coiling tail
C
offensive smell
D
adaptive colouration
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 #35827)
Biology
WAEC / WASSCE 2013
Variation & Genetics (Heredity)
A scientist who was involved in the development of evolution theory is
A
lamarck
B
mendel
C
morgan
D
pasteur
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #35828)
Biology
WAEC / WASSCE 2013
Adaptation & Evolution
Darwin noticed that organisms in similar habitats across the world looked alike. This illustrates
A
convergent evolution
B
adaptive radiation
C
co-evolution
D
descent with modification
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #35829)
Biology
UTME / JAMB 2013
Variety of Organisms & Classification of Living Things
Diagram
In the diagram, the structure labelled II is the
Attached Figure / Diagram
A
spermathecal pore
B
cocoon
C
clitellum
D
chaetea
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 #37253)
Biology
UTME / JAMB 2013
Basic Ecological Concepts, Ecosystems & Biomes
Diagram
The organism is found in soils rich in
Attached Figure / Diagram
A
mud
B
humus
C
clay
D
sand
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 #37254)
Biology
UTME / JAMB 2013
Basic Ecological Concepts, Ecosystems & Biomes
The organism is found in soils rich in
A
mud
B
humus
C
clay
D
sand
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: Official Exam / Past Question Archive
Biology
WAEC / WASSCE 2013
Reproduction in Plants & Animals
Solution
Study specimens L, M, N, P, Q, R and S carefully and use them to answer questions 4(a) to 4(d).
(a) Name two specimens which can be used for the following: (i) transaction; (ii) protection; (iii) statement.
(b) Stating observable features in specimens L, M, N, P,Q and R, Suggest one reason each for the answers given in 4(a)i), (ii) and (iii) above.
(c) State. (i) two observable similarities; (ii) two differences between specimens P and R.
(d)(i) Sate how observable features of specimen M adapt the specimen to its functions.
(ii) Arrange specimens L, , N and S in the increasing order of complexity of the organism to which they belong.
medium Difficulty
Verified Correct Answer: Option
Biological Concept & Syllabus Guide
(a)(i) Specimen used for reproduction: - Irish potato/Specimen P - Twig of Hibiscus/Dougainvillea/specimen Q
Q-Cutting of cassava/Specimen R.
(ii) Specimens used for protection: - Skin Of a goat/sheep/cow.
Specimen I. - Quill feather/ specimen M
- Shell of a snail/ specimen N
(iii) Specimens used for movement - Specimens M/Feather (Quill) Specimens S/ Hind wing of a cockroach.
Observation features with reasons:
For reproduction: P/lrish potato-pressure of buds/eye(s), for sprouting to produce/new shoot.
Q/ Twig of Hibiscus/Bougainvillea-has buds, for sprouting.
R/cutting of cassava- has buds, for sprouting.
For protection: L/Skin of a goat - presence of hairs/sheet-like structure to protect the body against mechanical injury.
M/Feather-broad and smooth to cover body and prevent wetting/provides insulation.
N/ Shell-hard/calcareous nature to protect soft body of snail.
For movement: M/Feather-those of wings and tail are flat and air-tight for flight.
S/Hind wing of cockroach-light and flexible for flight.
(c)(i) Similarity between specimen P and R: - Both Specimens have buds for reproduction. - both are stems. - both have lenticel.
(ii) Differences between Specimen P and R:
-Buds of Irish potato/ Specimen P buried in tuber while buds in cassava/ Specimen R protrude from the stem.
-Buds of Irish potato/ Specimen P are covered with scale leaves while the buds in cassava/ Specimens R are not covered.
- Irish potato/ Specimens P stores food while cassava/ Specimens R does not store food.
(d)(i) Adaptation of Specimen M to its function: - Vane is stiff; to enable it withstand air pressure during flight.
- Vane is broad, to provide a large Surface area for air lift.
- Vane is made up of barbs interlocked by barbulous, providing air light surface for flight.
- The quill is light and hollow, for buoyancy, water proof, to prevent birds from getting wet.
Increasing order of complexity: S-->N-->M-->L. OR Cockroach--> Snail -->Bird/Goat/Sheep/Cow.
Source: Official Exam / Past Question Archive
Biology
WAEC / WASSCE 2013
Respiration & Gaseous Exchange
Solution
(a) (i) What is respiration?
(ii) In a tabular form, state four differences between gaseous exchange and aerobic respiration
(b)(i) Explain the term residual air.
(ii) What is the importance of residula air to mammals?
(c) State four characteristic features associated with respiratory structures.
(d)(i) What is oxygen debt?
(ii) Outline three activities that can result in oxygen debt.
medium Difficulty
Verified Correct Answer: Option
Biological Concept & Syllabus Guide
(a) (i) Respiration: Respiration is the process by which living things breakdown/oxidise food/nutrients/glucose/ organic substances; to release energy/ATP for metabolic activities of the body; with or without the use of oxygen.
Gaseous exchange
Aerobic respiration
oxygen is used to oxidise glucose
organism and CO² moves out
process takes place outside the cell
process occurs inside the cell
physical process
chemical process
No energy is released
energy is released
No enzymes involved
enzymes involved
(b) (I) Residual Air: During breathing out/expiration/exhalation; not all the air is removed from the lungs; the air left inside the lungs during breathing out is residual air.
(ii) Importance of Residual Air: Air is left in the lungs so that the lungs do not collapse; air is always left inside the lungs so that more oxygen can be removed (diffuse) into the blood stream.
(c) Characteristic features of respiratory structures: -
They have wide/large surface area
they are moist
thin walled membranes
they are highly vascularised/ richly supplied with blood
highly permeable to gases.
(d)(i) Oxygen debt: The build up of lactic acid; during strenuous exercise is poisonous and makes the muscles ache; oxygen is needed to break down/ get rid of the lactic acid, that is why athletes continue breathing heavily even after the exercise is over; the oxygen needed to get rid of the lactic acid is known as oxygen debt.
(ii) Activities that can result in oxygen debt: Running; boxing; swimming /any correct example of strenuous activities.
Source: Myschool Past Questions Archive (Record #52728)
Biology
WAEC / WASSCE 2013
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
(a) What is photosynthesis?
(b) List: (i) four external factors
(ii) two internal factors; that affect the rate of photosynthesis.
(c)(i)List the major products of the light dependent stage of photosynthesis.
(ii)State the importance of each of the products listed in (c)(i) above.
(d)(i) Explain why there are no green plants at the lower depths of some lakes.
(ii) State why decomposers are important to flowering plants.
medium Difficulty
Verified Correct Answer: Option
Biological Concept & Syllabus Guide
(a) Photosynthesis: The process by which green plants; manufacture/ synthesize their food/organic compounds; from carbon dioxide and water; in the presence of sunlight/solar energy; giving off oxygen as a byproduct. OR
(b) (i) External Factors: Light intensity/sunlight; carbon dioxide concentration; temperature; pollution; water
(ii) Internal factors: Hormones; chlorophyll/presence of ehiorophyll/ebloroplast; enzymes; number/state of stomata
(c)(i) Major products of light-dependent stage of photosynthesis: - ATP (Adenosine triophosphate)/energy, -H+ (Hydrogen ion), - OH- (Hydroxyl ion), - NADPH2 (reduced nicotinamide adenine dinucleotide phosphate), - 0² (oxygen gas).
(ii) Importance of the products: -ATP to generate energy for the dark stage reaction, - 2H+ NADP→ NADPH2, - 0H- (Hydroxyl ion)→ H2O, O2 gas, NADPH2 - to generate hydrogen ions/to reduce carbon dioxide /C02 to form carbohydrate in the dark stage; - 02 - given off into the atmosphere for animals/other organisms to use for respiration.
(d) (i) Why green plants are absent at the lower depth of some lakes: Light intensity decreases with depth in water bodies; so at certain depths in water, there is no light for photosynthesis to occur.
(ii) Importance of decomposers to flowering plants: Decomposers (fungi/bacteria) break down dead organic matter; and release the nutrients in them; 002 in the soil/water/environment; which is absorbed by plants for growth.
Source: Myschool Past Questions Archive (Record #52729)