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Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
An environmental problem caused by Sulphur (IV) oxide is
A
acid rain
B
deforestation
C
global warming
D
Erosion
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Sulphur dioxide SO\(_2\) can cause many environmental problems, including acid rain, smog, and damage to plants. When SO\(_2\) combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain damages plants and trees, and can kill fish and other aquatic specie.
Source: Myschool Past Questions Archive (Record #71909)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
The phenomenon by which a farmland that is left to fallow for several years develops into a forest is called
A
Succession
B
afforestation
C
population
D
colonization
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The process by which a fallow farm field develops into a forest is called ecological succession. This is when natural communities replace one another over time. In ecological succession, an abandoned farm field will first become a meadow, then bushes, and eventually a forest. This process can take many years.
Source: Myschool Past Questions Archive (Record #71910)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
Which of the following statements is correct about the ABO blood group system?
A
Antigens are located on the surface of white blood cells
B
Antibodies are located in the blood plasma
C
Antibodies are located on the surface of the red blood cells
D
Antigens are located in the blood plasma
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
In the ABO blood group system, antibodies are located in the plasma, which is the liquid part of blood.
The ABO blood group system is based on the presence of antigens and antibodies in the blood.
Antigens are protein molecules on the surface of red blood cells.
Antibodies are proteins in the plasma that recognize foreign substances.
Source: Myschool Past Questions Archive (Record #71919)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
A woman with blood group A gives birth to a child with blood group O. Which of the following blood groups cannot belong to the father?
A
B
B
A
C
AB
D
O
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
A woman with blood group A and a man with blood group AB can never produce a child with blood group O. Blood group A could either be from AA homozygous or AO heterozygous.
Source: Myschool Past Questions Archive (Record #71920)
Biology
WAEC / WASSCE 2024
Science of Living Things
Diagram
Solution
The diagram above is an illustration of genetic cross between two parents. The parental gametes I, II, III and IV gave rise to the offspring below. Study it and answer questions 43 and 44.
Gametes I, II, III and IV, respectively are
Attached Figure / Diagram
A
T,T,T and t
B
T, t, t, and t
C
T, T, t and t
D
T, t, T and t
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
First try to retrace the offspring back to get the gametes. What we got were T, t, t, and t
(See diagram above.)
Source: Myschool Past Questions Archive (Record #71922)
Biology
WAEC / WASSCE 2024
Science of Living Things
Diagram
Solution
Which of the following statements is correct about the cross?
Attached Figure / Diagram
A
Both parents are heterozygous
B
The male is not heterozygous
C
The female is homozygous
D
Both parents are homozygous
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
From the diagram, the first organism(most likely to be the male parent) is heterozygous (Tt) while the second parent(most likely to be the female parent) is homozygous (tt).
Source: Myschool Past Questions Archive (Record #71923)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
The physical appearance of an organism is described as its
A
phenotype
B
genotype
C
allele
D
chromosome
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The physical appearance of an organism is described as its phenotype. A phenotype refers to the observable characteristics of an organism, including its physical traits, which are determined by its genotype (genetic makeup) and can be influenced by environmental factors.
Genotype is the genetic makeup of an organism or person, which is determined by their DNA sequence. It can also refer to the alleles, or variant forms of a gene, that an organism has.
Source: Myschool Past Questions Archive (Record #71924)
Biology
WAEC / WASSCE 2024
Science of Living Things
Diagram
Solution
A farmer planted many seeds on a small piece of land. The plants that germinated are as shown above.
Which of the following effects would not be observed among the population of the plants?
Attached Figure / Diagram
A
Rise in disease condition
B
Death
C
Mutualistic relationship
D
Competition
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Overpopulation would definitely leads to rise in disease condition, death and competition among the organisms but there won't be any mutualistic relationship.
Source: Myschool Past Questions Archive (Record #71912)
Biology
WAEC / WASSCE 2024
Science of Living Things
Diagram
Solution
The bar chart above shows the data of sources of energy used for cooking in a community. Study it and answer questions 37 and 38.
The source of energy that is mostly used in the community is
Attached Figure / Diagram
A
solar
B
Kerosene
C
coal
D
wind
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Kerosene has the longest bar, showing the highest number of households.
Source: Myschool Past Questions Archive (Record #71914)
Biology
WAEC / WASSCE 2024
Science of Living Things
Diagram
Solution
The two sources of energy that would mostly lead to pollution in the community are
Attached Figure / Diagram
A
solar and kerosene
B
coal and wind
C
kerosene and coal
D
solar and wind
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
Burning kerosene and coal can cause significant air and water pollution, as well as climate change. Burning kerosene releases carbon dioxide (CO2), particulate matter, nitrogen oxides (NOx), and sulfur oxides (SOx). These emissions contribute to climate change and degrade air quality. Also, burning coal releases harmful air pollutants, including benzene, formaldehyde, and carbon monoxide.
Source: Myschool Past Questions Archive (Record #71915)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
An individual found a strange bird that is tagged as an endangered specie. What should the individual do?
A
Kill it
B
Take it to an aquatic environment
C
Return it to its natural habitat
D
Sell it at a very high price
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The individual should return the endangered bird to its natural habitat, which will ensure conservation and in turn restore population ans preserve ecosystem balance, so the specie doesn't go into extinction.
Source: Myschool Past Questions Archive (Record #71916)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
Which of the following traits is not inheritable? Ability to
A
taste P.T.C
B
roll the tongue
C
move the ear
D
roll the eyeball
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Simply "rolling the eyeball" as a conscious gesture is not considered an inheritable trait, as it's primarily a learned behaviour and not directly coded in our genes; however, certain involuntary eye movements like "nystagmus" can be genetic and manifest as eye rolling in some situations, meaning there could be a hereditary component in specific cases related to eye movement.
Source: Myschool Past Questions Archive (Record #71918)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
Mutation leads to evolution because it
A
kills all organisms where it has occurred.
B
gives rise to offspring having same characteristics as the parents
C
does not confer adaptability to the offspring
D
gives rise to new individuals that differ from their parents
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Mutation leads to evolution by introducing genetic variations within a population, which natural selection can then act upon, favouring individuals with advantageous mutations that allow them to survive and reproduce more successfully, thus passing on those beneficial traits to future generations, gradually changing the characteristics of the population over time and leading to evolution; essentially, mutations are the raw material for evolution, providing the diversity needed for natural selection to operate.
Source: Myschool Past Questions Archive (Record #71925)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
The male and female gametes which bear genes for inheritance in plants are located in the
A
anthers and petals
B
sepals and petals
C
stamens and pistils
D
stamens and petals
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
In flowering plants, male gametes are in the anthers and female gametes are in the ovules.
Male gametes
Located in pollen grains
Produced in the anthers of the flower
Part of the stamen, the male structure of the flower
Female gametes
Located in ovules
Produced in the ovary of the flower
Part of the pistil, the female structure of the flower
Source: Myschool Past Questions Archive (Record #71927)
Biology
WAEC / WASSCE 2024
Science of Living Things
Solution
Which type of breeding is represented by industrial melanism in peppered moths?
A
Artificial selection
B
Natural selection
C
Inbreeding
D
Outbreeding
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Industrial melanism in peppered moths is an example of evolution by natural selection. It occurred when the colour of the peppered moth population changed in response to air pollution from coal-burning factories during the Industrial Revolution.
The common pale form of the peppered moth was replaced by a previously unknown black form. The dark moths were better able to blend in with the darkened bark of trees, while the pale moths were more visible to predators. The dark form became more common, and in some areas of England, the original pale form was almost lost by the end of the 19th century.
Source: Myschool Past Questions Archive (Record #71933)