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Biology
WAEC / WASSCE 2012
Population Ecology, Habitats & Conservation
Solution
Which of the following factors would be least likely to act as a density dependent limiting factor in a population of
mice?
A
Buildup of waste products
B
Predation
C
Parasitism
D
Unfavourable climate
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
An unfavorable climate is generally considered a density-independent limiting factor, not a density-dependent one, meaning its effects on a population are not related to the population's density or size.
Source: Myschool Past Questions Archive (Record #20375)
Biology
WAEC / WASSCE 2012
Variety of Organisms & Classification of Living Things
The primary cause of species endangerment is
A
disappearing habitats
B
increase in temperatures
C
acid rain
D
exposure to hazardous wastes
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 #20376)
Biology
WAEC / WASSCE 2012
Variation & Genetics (Heredity)
The following pairs of traits are examples of continuous and discontinuous variations respectively except
A
eye Colour and body weight,
B
height and blood group
C
skin colour and fingerprints
D
bodyweight and tongue rolling.
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 #20377)
Biology
WAEC / WASSCE 2012
Variation & Genetics (Heredity)
Which of the following statements is true 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 red blood cells
D
Antigens are located in the blood plasma
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 #20378)
Biology
WAEC / WASSCE 2012
Variation & Genetics (Heredity)
The classes of fingerprints in man are
A
whorl, alternate, opposite and compound
B
compound, loop, whorl! and alternate
C
whorl, arch, compound and loop
D
arch, simple, compound and opposite
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 #20379)
Biology
WAEC / WASSCE 2012
Variation & Genetics (Heredity)
Which of the following diseases is transmittable through genes?
A
HIV /AIDS
B
Sickle cell anaemia
C
Diabetes
D
Presbyopia
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 #20380)
Biology
WAEC / WASSCE 2012
Variation & Genetics (Heredity)
Solution
Two plants with red flowers were back crossed, which of the following results indicate that the plants are heterozygous
red flowers, where red flowers are dominant?
A
75% red and 25% white
B
50% red and 50% white
C
100% white
D
100% red
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
In genetics, a backcross (BC) is a cross between a hybrid and one of its parents or an individual genetically similar to its parent. If two heterozygous (Rr) plants (where R represents the dominant red allele and r represents the recessive white allele) are crossed, the expected phenotypic ratio would be 75% red and 25% white. This is because three out of the four possible combinations (RR, Rr, rR) would result in red flowers, while only one combination (rr) would result in white flowers.
Source: Myschool Past Questions Archive (Record #20381)
Biology
WAEC / WASSCE 2012
Variation & Genetics (Heredity)
In the structure of DNA, which of the following statements is true?
A
The double helix are held together by covalent bonds
B
Nucleotide is made up of ribose, phosphate and an organic nitrogen compound
C
Guanine is the opposite of cytosine
D
Adenine is the opposite of cytosine
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 #20382)
Biology
WAEC / WASSCE 2012
Variety of Organisms & Classification of Living Things
In a case of complete dominance, what is the phenotypic ratio of the cross Bb X Bb; where B =black and b = white?
A
1 black : 1 grey : 2 whites
B
1 black : 3 whites
C
1 black : 2 blues : 1 white
D
3 blacks : 1 white
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 #20383)
Biology
WAEC / WASSCE 2012
Variety of Organisms & Classification of Living Things
Diagram
How many food chains are in the diagram?
Attached Figure / Diagram
A
Three
B
Four
C
Five
D
Six
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 #20369)
Biology
WAEC / WASSCE 2012
Basic Ecological Concepts, Ecosystems & Biomes
Plants with breathing roots are characteristic features of vegetation in
A
tropical grassland
B
temperate grassland
C
saltwater swamp
D
Tropical rain forest
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 #20370)
Biology
WAEC / WASSCE 2012
Variety of Organisms & Classification of Living Things
Diagram
In which of the zones can very few organisms be found
Attached Figure / Diagram
A
I
B
II
C
III
D
IV
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 #20371)
Biology
WAEC / WASSCE 2012
Basic Ecological Concepts, Ecosystems & Biomes
Diagram
Which of the following factors exerts a major effect on the distribution of living organisms in the habitat?
Attached Figure / Diagram
A
Salt
B
pH
C
Light
D
Rainfall
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 #20372)
Biology
WAEC / WASSCE 2012
Variety of Organisms & Classification of Living Things
The use of water closet and septic tanks is preferred to the use of
bucket and pit latrines because
A
it is cost effective
B
contaminated faeces are completely kept away from flies
C
the water for flushing contains chlorine which kills the germs
D
It prevents flies from breeding
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 #20373)
Biology
WAEC / WASSCE 2012
Variation & Genetics (Heredity)
Solution
Two yellow-flowered hybrid plants each carrying a recessive factor for flowers with green colour were crossed.
Which of the following ratios shows the correct proportion of offspring that have green flowers?
A
2 in 2
B
1 in 3
C
1 in 4
D
1 in 5
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
When two yellow-flowered hybrid plants each carrying a recessive factor for green flowers are crossed, the genotype of the parents would be Yy (where Y represents the dominant yellow flower allele and y represents the recessive green flower allele). The possible genotypes of the offspring from this cross would be YY, Yy, Yy, and yy. Among these, only the yy genotype will result in green flowers.
Source: Myschool Past Questions Archive (Record #20384)