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Biology
UTME / JAMB 1995
Variation & Genetics (Heredity)
The specific number of chromosomes in each somatic cell is represented by
A
2N
B
23
C
2N
D
N
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 #5667)
Biology
UTME / JAMB 1995
Variation & Genetics (Heredity)
A man with blood group a is married to a woman with blood group A. Which of the following group combinations is possible if the family has three children?
A
B, A, AB
B
O, A, B
C
B, AB, AB
D
A, O, A
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 #5668)
Biology
UTME / JAMB 1995
Variety of Organisms & Classification of Living Things
Solution
The F1 of a cross between a tall and a dwarf plant was tall. The F1 was advanced to F2. How many of 120F2 plants will be dwarf?
A
30
B
60
C
90
D
120
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
See the image above
Source: Myschool Past Questions Archive (Record #5669)
Biology
UTME / JAMB 1995
Variation & Genetics (Heredity)
Solution
All the sons of a colour-blind woman will be coloured blind regardless of the state of the father because
A
the egg determines the phenotype of the son
B
sons inherit the sex chromosome of their mothers
C
the father's sex chromosomes is weaker in sons
D
sex-linked traits express dominance in females
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Colour blindness, specifically red-green colour blindness, is a sex-linked recessive trait, meaning the genes responsible are located on the X chromosome, making it more common in males.
In the case of X-linked dominant traits, a single copy of the dominant allele on the X chromosome is sufficient for a female to express the trait, as they have two X chromosomes. If a female inherits one X chromosome with a dominant allele, she will express the trait, regardless of whether the other X chromosome carries a recessive allele.
Males with an X-linked dominant trait will always express it, as they only have one copy of the X chromosome.
X-linked recessive traits are expressed in females only if they inherit two copies of the recessive allele, one on each X chromosome.
Source: Myschool Past Questions Archive (Record #5671)
Biology
UTME / JAMB 1995
Adaptation & Evolution
The slender, long and slightly curved beak of the sun-bird is an adaptation for breeding for feeding on
A
nectar
B
small seeds
C
big seeds
D
insects
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 #5672)
Biology
UTME / JAMB 1995
Variety of Organisms & Classification of Living Things
Scales on reptiles are a feature for
A
conserving water
B
conserving food
C
protecting the skin
D
locomotion
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 #5673)
Biology
UTME / JAMB 1995
Adaptation & Evolution
The colour of the ventral surface of a fish is lighter than that of the dorsal. This is mainly
A
an adaptation for movement
B
an adaptation for camouflage
C
for attracting mates
D
for regulating body temperature
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 #5675)
Biology
UTME / JAMB 1995
Basic Ecological Concepts, Ecosystems & Biomes
The least evidence in support of the theory of evolution is provided by the study of
A
anatomy
B
ecology
C
geology
D
embryology
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 #5676)
Biology
UTME / JAMB 1995
Variety of Organisms & Classification of Living Things
Solution
From which group of animals are the mammals generally believed to have most recently evolved?
A
Reptiles
B
Fish
C
Amphibians
D
Birds
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The mammals are believed to have evolved from Therapsid (mammal-like) reptiles some 220 million years ago in the Triassic period, before the first birds.
So, the correct answer is 'Reptiles'
A major transition in the evolution of life occurred when mammals evolved from one lineage of reptiles. This transition began during the Permian (286 - 248 million years ago) when the reptile group that included Dimetrodon gave rise to the "beast-faced" therapsids. (The other major branching, the "lizard-faced" sauropsids, gave rise to birds and modern reptiles). These mammal-like reptiles in turn gave rise to the cynodonts e.g. Thrinaxodon during the Triassic period.
Source: Myschool Past Questions Archive (Record #5677)
Biology
UTME / JAMB 1995
Nervous, Hormonal Coordination & Sense Organs
Solution
The part labelled X is the
A
axon
B
cell body
C
terminal dendrites
D
synapse
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The part labeled X is the Cell body also known as SOMA.
Source: Official Exam / Past Question Archive
Biology
UTME / JAMB 1995
Nervous, Hormonal Coordination & Sense Organs
Diagram
Solution
The diagram represents
Attached Figure / Diagram
A
sensory neurone
B
relay neurone
C
afferent neurone
D
motor neurone
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The image is a diagram of a motor(efferent) neurone. it transmits impulses away from the central nervous system to the effector organ,e.g. muscles and glands.
Source: Myschool Past Questions Archive (Record #41365)
Biology
UTME / JAMB 1995
Nervous, Hormonal Coordination & Sense Organs
Diagram
Solution
The part labelled X is the
Attached Figure / Diagram
A
axon
B
cell body
C
terminal dendrites
D
synapse
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The part labeled X is the Cell body also known as SOMA.
Source: Myschool Past Questions Archive (Record #41367)
Mathematics
UTME / JAMB 1994
Binary Operations, Matrices & Determinants
Solution
The determination of the matrix \(\begin{pmatrix} 1 & 3 & 3 \\ 4 & 5 & 6\\ 2 & 0 & 1 \end{pmatrix}\) is
A
-67
B
-57
C
-1
D
3
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
((1 x5x1) +( 3x6x2) + (3x4x0)) - ((3x5x2) + (1x6x0) + (3x4x1))
( 5 + 36) - (30 +12) = 41 - 42
= -1
Source: WAEC / JAMB / NECO Classroom Archive (Record #31019)
Mathematics
UTME / JAMB 1994
Algebraic Expressions, Polynomials & Factorisation
Solution
Factorize a2x - b2y - b2x + a2y
A
(a - b)(x + y)
B
(y - x)(a - b)(a + b)
C
(x - y)(a - b)(a + b)
D
(x + y)(a - b)(a + b)
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
a2x - b2y - b2x + a2y = a2x - b2x - b2y + a2y Rearrange
= x(a2 - b2) + y(a2 - b2)
= (x + y)(a2 - b2)
= (x + y)(a + b)(a - b)
Source: WAEC / JAMB / NECO Classroom Archive (Record #31007)
Physics
UTME / JAMB 1994
Work, Energy, Power & Simple Machines
Diagram
Solution
In the fig above, XY is of length 1m, The value of R at balance point Z is
Attached Figure / Diagram
A
3.0Ω
B
13.3Ω
C
15.0Ω
D
30.0Ω
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
At null deflection, p.d across R = p.d across xz
p.d across 20\Omega = p.d across zy
\(\frac{R}{20}\) = \(\frac{60}{40}\)
R = 30\Omega
Source: WAEC / JAMB / NECO Classroom Archive (Record #41724)