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Biology
WAEC / WASSCE 2018
Respiration & Gaseous Exchange
Solution
The structures for gaseous exchange in breathing roots are
A
stomata
B
lenticels
C
cuticle
D
mitochondria
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Breathing roots, also known as pneumatophores, have portions of the root which grow upward until they project some centimetres above the low-tide level. They have small openings called lenticels in their bark so that air can reach the rest of the plant’s root system.
Source: Myschool Past Questions Archive (Record #48404)
Biology
WAEC / WASSCE 2018
Variety of Organisms & Classification of Living Things
Diagram
Solution
The diagram above is an illustration of the life cycle of an insect. The adult fly in this cycle is called
Attached Figure / Diagram
A
Housefly
B
Butterfly
C
Cockroach
D
Mosquito
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
From the diagram, the larva is a caterpillar, hence, the adult is called a Butterfly.
Source: Myschool Past Questions Archive (Record #48409)
Biology
WAEC / WASSCE 2018
Reproduction in Plants & Animals
Diagram
Solution
In the diagram above, the larva is also known as
Attached Figure / Diagram
A
Nymph
B
Caterpillar
C
Maggot
D
Chrysalis
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The diagram is the life cycle of a butterfly whose larva is called Caterpillar.
Source: Myschool Past Questions Archive (Record #48412)
Biology
WAEC / WASSCE 2018
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
The source of energy required by plants during food production is
A
Photosynthesis
B
Chlorophyll
C
Sunlight
D
Microorganisms
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The food production process (photosynthesis) makes use of the energy of light for the process.
Source: Myschool Past Questions Archive (Record #48417)
Biology
WAEC / WASSCE 2018
Variety of Organisms & Classification of Living Things
Solution
One major difference between plant and animals nutrition is the ability of plants to synthesize
A
Food for plants and animals
B
Water for plants
C
Water for animals
D
Food for plants only
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The food produced by plants serve as food both for the plants and animals (herbivores and in extension, all animals.)
Source: Myschool Past Questions Archive (Record #48422)
Biology
WAEC / WASSCE 2018
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
By what process is starch converted into maltose?
A
Hydrolysis
B
Condensation
C
Translocation
D
Photosynthesis
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Carbohydrates are broken down into their component sugars by hydrolysis. This type of hydrolysis is called Saccharification.
Source: Myschool Past Questions Archive (Record #48428)
Biology
WAEC / WASSCE 2018
Transport System in Plants & Animals
Solution
The ascent of water in tall trees is mainly due to
A
adhesive forces
B
transpiration pull
C
root pressure
D
cohesive forces
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Transpiration pull or the suction force is the force which aids in drawing the water upward from roots to leaves which is used by the leaves for photosynthesis and excess is released through the stomata.
Source: Myschool Past Questions Archive (Record #48431)
Biology
WAEC / WASSCE 2018
Digestive System & Feeding Mechanisms
Solution
The duodenum of a person was surgically removed. Which of the following substances would have their digestion affected?
A
starch and protein only
B
starch and lipids
C
starch, peptones and maltose
D
starch, protein and lipids
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
These three (starch, protein and lipids) have a process to undergo in the duodenum (the beginning of the small intestine), therefore, the surgery will affect them.
Source: Myschool Past Questions Archive (Record #48438)
Biology
WAEC / WASSCE 2018
Digestive System & Feeding Mechanisms
Solution
Which of the following dental formulae represents the dentition in rabbits?
A
\(I\frac{2}{1}\) \(C\frac{0}{0}\) \(P\frac{3}{2}\) \(M\frac{3}{3}\)
B
\(I\frac{2}{2}\) \(C\frac{1}{1}\) \(P\frac{2}{2}\) \(M\frac{3}{3}\)
C
\(I\frac{1}{2}\) \(C\frac{0}{0}\) \(P\frac{2}{3}\) \(M\frac{3}{3}\)
D
\(I\frac{2}{1}\) \(C\frac{0}{1}\) \(P\frac{3}{2}\) \(M\frac{3}{3}\)
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The normal dental formula of rabbits is I2/1 C0/0 P3/2 M3/3 for 28 teeth.
Source: Myschool Past Questions Archive (Record #48443)
Biology
WAEC / WASSCE 2018
Basic Ecological Concepts, Ecosystems & Biomes
Solution
In an ecosystem, the least efficient energy transfer link is from the
A
secondary consumers to decomposers
B
sun to producers
C
primary consumers to secondary consumers
D
producer to primary consumers
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
While energy transfer between biological trophic levels (producers to consumers, or consumers to consumers) generally follows the 10% rule—meaning about 10% of energy is transferred while 90% is lost—the transfer from the sun to producers is significantly less efficient. Most of the solar radiation reaching the Earth cannot be used for photosynthesis; plants typically capture and convert only 1% to 2% (sometimes cited as up to 4%) of the available solar energy into chemical energy. Because this percentage is much lower than the ~10% efficiency seen in subsequent links of the food chain, it is the least efficient transfer link in the ecosystem.
Source: Myschool Past Questions Archive (Record #48469)
Biology
WAEC / WASSCE 2018
Population Ecology, Habitats & Conservation
Solution
Xerophytes have the following characteristics aimed at conserving water except
A
thick cuticle
B
broad leaf surfaces
C
sunken stomata
D
waxy cuticle
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The xerophytes have reduced leaf size in order to reduce the surface area, thereby reducing the water loss in the plant.
Source: Myschool Past Questions Archive (Record #48471)
Biology
WAEC / WASSCE 2018
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Solution
An association between living organisms in which one lives on and feeds at the expense of the other is known as
A
commensalism
B
predation
C
parasitism
D
mutualism
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host.
Source: Myschool Past Questions Archive (Record #48472)
Biology
WAEC / WASSCE 2018
Population Ecology, Habitats & Conservation
Solution
When large numbers of organisms share limited space and resources, the immediate result is
A
extinction
B
emigration
C
competition
D
immigration
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Competition in a territory is as a result of a hassle for the available resources within the territory. For instance, when the water in a river seems to be drying out, the organisms in the water begin to compete for the water.
Source: Myschool Past Questions Archive (Record #48473)
Biology
WAEC / WASSCE 2018
Growth, Micro-organisms & Public Health
Solution
Which of the following disease ic caused by a bacterium?
A
ringworm
B
poliomyelitus
C
syphilis
D
malaria
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Syphilis is caused by a bacterium known as Trepenoma pallidum. It is majorly passed on by sex.
Source: Myschool Past Questions Archive (Record #48475)
Biology
WAEC / WASSCE 2018
Variety of Organisms & Classification of Living Things
Solution
The diagram above is an illustration of an experimental set-up to demonstrate a property of soil. The property of soil demonstrated is
A
particle size
B
capillarity
C
colour
D
texture
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The setup is to show the capillarity (water rise) of each of the soil types
Source: Myschool Past Questions Archive (Record #48459)