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Biology
WAEC / WASSCE 2023
Science of Living Things
Solution
Which of the following soil types have a high capillarity?
A
Sand and clay
B
loam and sand
C
silt and sand
D
silt and clay
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Both silt and clay particles have very small pores, which contribute to higher capillarity. When combined, the silt and clay would likely result in a soil with relatively high capillarity.
Source: Myschool Past Questions Archive (Record #68672)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
Solution
The diagram above is an illustration of a structure in the skeletal system of humans. Study it and answer the question
the illustrated structure is a part of the
Attached Figure / Diagram
A
appendicular skeleton
B
axial skeleton
C
axis vertebrae
D
cervical vertebrae
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The skull is part of the axial skeleton. It is the bony structure that forms the head and encloses and protects the brain. The skull is located along the central axis of the body, and it is one of the key components of the axial skeleton.
Source: Myschool Past Questions Archive (Record #68676)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
Solution
The diagram below is an illustration of a structure in the skeletal system of humans. Study it and answer the question
An individual was involved in a car accident and the illustrated structure was badly injured. Which of the following structures would most likely be affected?
Attached Figure / Diagram
A
Clavicle, tongue and pelvis
B
Eye, cerebellum and ear
C
Ear, brain and hinge joint
D
Lumbar, eye and teeth
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
An individual was involved in a car accident and the illustrated structure was badly injured. Which of the following structures would most likely be affected?
Source: Myschool Past Questions Archive (Record #68678)
Biology
WAEC / WASSCE 2023
Science of Living Things
Solution
Study the list of organisms below and use them to answer the questions.
I-Hydra
II-Owl
III-Snake
IV-Snail
The arrangement of the organisms in order of increasing complexity is
A
II-III-I-IV
B
I-IV-III - II
C
I-II-III-IV
D
IV-III-II - I.
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The arrangement of organisms in order of increasing complexity is Hydra (a simple multicellular organism), Snail (a more complex invertebrate), Snake (a simple vertebrate), and Owl (a more complex vertebrate). This is because as we move from invertebrates to vertebrates, the level of organization and complexity increases. The complexity of an organism can be determined by its level of organization, from cellular to tissue to organ to system level.
Source: Myschool Past Questions Archive (Record #68680)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
Solution
The diagram above is an illustration of a cell in which photosynthesis takes place. Study it and answer the question
In which of the labeled parts would molecules of water and carbon (IV) oxide combine to form sugar?
Attached Figure / Diagram
A
I
B
III
C
II
D
IV
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The labelled part where water molecule will combine with carbon(IV) oxide to produce sugar is the part where the green pigment(chlorophyll) is found, and that is the Chloroplast. Hence, the correct answer is option D
Source: Myschool Past Questions Archive (Record #68705)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
The diagram above is an illustration of a cell in which photosynthesis takes place. Study it and answer the question. the oxygen gas formed in the cell diffuses out of the cytoplasm into the air spaces through the part labeled
Attached Figure / Diagram
A
I
B
II
C
III
D
IV
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 #68708)
Biology
WAEC / WASSCE 2023
Science of Living Things
Solution
Fishes survive in water mainly because they possess
A
streamlined body
B
scales
C
paired fins
D
gills
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Gills are specialized respiratory organs found in fish that allow them to extract oxygen from water. While a streamlined body, scales, and paired fins are all essential adaptations for fish to navigate and survive in water, none of them directly relate to the process of oxygen extraction and respiration like gills do. However, without gills, fish would not be able to respire efficiently underwater and would not survive in their aquatic habitats.
Source: Myschool Past Questions Archive (Record #68711)
Biology
WAEC / WASSCE 2023
Science of Living Things
Solution
The tricuspid valve is located between the
A
right auricle and right ventricle.
B
aorta and the left ventricle
C
left auricle and left ventricle
D
right auricle and the superior vena cava
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The heart has four chambers: two atria (auricles) and two ventricles. The tricuspid valve is one of the heart's valves and is located between the right atrium (right auricle) and the right ventricle.
Source: Myschool Past Questions Archive (Record #68713)
Biology
WAEC / WASSCE 2023
Science of Living Things
Solution
The androecium in a flowering plant is a collection of
A
stamens
B
sperms
C
ovules
D
filament
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The androecium is the male reproductive part of a flowering plant, and it is composed of stamens. Each stamen consists of two main parts:
Filament
Anther
Source: Myschool Past Questions Archive (Record #68715)
Biology
WAEC / WASSCE 2023
Science of Living Things
Solution
The eye defect caused by an uneven curvature of the cornea or lens or both is
A
myopia
B
presbyopia
C
astigmatism
D
hypermetropia
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Astigmatism is a common refractive error of the eye that occurs when the cornea or lens has an irregular shape. In a normal eye, the cornea and lens have a smooth, evenly curved surface, similar to a sphere. However, in astigmatism, the cornea or lens may be more curved in one direction than the other, resulting in a refractive error.
Source: Myschool Past Questions Archive (Record #68692)
Biology
WAEC / WASSCE 2023
Science of Living Things
Solution
Which of the following processes does not occur during photosynthesis?
A
Energy from sunlight is absorbed
B
Carbon (IV) oxide is evolved
C
oxygen is evolved
D
water is split
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
During photosynthesis, carbon dioxide is taken in by the plant, and water is split to produce glucose and oxygen in the presence of sunlight and chlorophyll.
Source: Myschool Past Questions Archive (Record #68694)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
Solution
The illustration above is a genetic diagram. Study it and answer the question below.
What is the name of the genetic diagram?
Attached Figure / Diagram
A
Genetic square
B
Inheritance diagram
C
Punnett square
D
Genetic cross
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
A Punnett square is a graphical representation used in genetics to predict the possible genotypes of offspring in a cross between two individuals. It is named after Reginald Punnett, a British geneticist who developed the method. In a Punnett square, the genotypes of the parents are represented on the top and left sides of the square. The possible combinations of alleles from each parent are then filled in the cells of the square to show the potential genotypes of their offspring.
Source: Myschool Past Questions Archive (Record #68698)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
Solution
The illustration above is a genetic diagram. Study it and answer the question below
What do the labels I, II, III, and IV respectively represent?
Attached Figure / Diagram
A
Ee, Ee, EE and E
B
EE, EE, Ee, and Ee
C
EE, EE, EE and EE
D
EE, EE, Ee and ee
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The labels I, II, III and IV represent the genotypes of the offspring from a cross between two heterozygous parents (Ee). I and II represent the homozygous dominant (EE) and heterozygous (Ee) offspring, respectively, while III and IV represent the heterozygous (Ee) and homozygous recessive (ee) offspring, respectively.
Source: Myschool Past Questions Archive (Record #68700)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
Solution
The illustration above is a genetic diagram. Study it and answer the question
What is the genotypic ratio
Attached Figure / Diagram
A
1:1
B
4:0
C
1:3
D
1:2:1
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The genotypic ratio is the ratio of the number of individuals with different genotypes. From the diagram, if you do the crossing I = EE, II = EE, III = Ee, IV = Ee i.e 2 EE and 2 Ee
⇒ Genotypic ratio will be 2 : 2 which is equivalent to 1:1.
Source: Myschool Past Questions Archive (Record #68702)
Biology
WAEC / WASSCE 2023
Science of Living Things
Diagram
Solution
The diagram above is an illustration of some structures used for gaseous exchange in humans. Study it and answer the question
The parts labeled 1, II, III, and IV respectively are
Attached Figure / Diagram
A
larynx, bronchus, bronchiole and trachea.
B
bronchus, bronchiole, trachea and larynx.
C
bronchiole, trachea, bronchus and larynx.
D
larynx, trachea, bronchiole, and bronchus.
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The parts labelled 1, II, III and IV respectively are larynx, trachea, bronchiole and bronchus
The larynx, commonly known as the voice box, is a cartilaginous structure located in the neck, just below the pharynx and above the trachea.
The trachea, also known as the windpipe, is a long tube made of C-shaped rings of cartilage that extend from the larynx to the bronchi.
Bronchioles are small, narrow tubes that branch out from the bronchi. They represent the smaller airways within the lungs.
The bronchi are the two main branches that arise from the lower end of the trachea, one leading to each lung.
Source: Myschool Past Questions Archive (Record #68718)