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Biology
UTME / JAMB 1993
Basic Ecological Concepts, Ecosystems & Biomes
Solution
What ecological condition favours the breeding of black flies?
A
Fresh water habitat
B
Water in ponds and swamp
C
Water in small containers
D
Fast flowing streams
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The ecological condition that favors the breeding of black flies is flowing water from rivers and streams to irrigation ditches.
Source: Myschool Past Questions Archive (Record #5294)
Biology
UTME / JAMB 1993
Transport System in Plants & Animals
Carbon monoxide poisons tissue by
A
constricting the blood vessels
B
killing the cells
C
combining with haemoglobin
D
rupturing the blood vessels
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 #5296)
Biology
UTME / JAMB 1993
Variation & Genetics (Heredity)
Which of the following is an example of discontinuous variation observed in man?
A
Skin colours
B
Tongue rolling
C
Body weight
D
Height
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 #5297)
Biology
UTME / JAMB 1993
Growth, Micro-organisms & Public Health
Solution
During blood transfusion, agglutination may occur when
A
contrasting antigens reacts with contrasting antibodies
B
similar antigens react with similar antibodies
C
two different antigens react with each other
D
two different antibodies react with each other
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Agglutination during blood transfusion occurs when:
- Red blood cells from the donor have antigens on their surface that are different from the recipient's antigens.
- The recipient's immune system recognizes these foreign antigens and produces antibodies against them.
- The antibodies bind to the antigens on the donor's red blood cells, causing them to clump together (agglutinate).
This reaction can lead to serious complications, including hemolysis (red blood cell destruction) and even death. To prevent this, blood types are carefully matched before transfusion.
Source: Myschool Past Questions Archive (Record #5298)
Biology
UTME / JAMB 1993
Variation & Genetics (Heredity)
Diagram
Solution
In the illustration above, the genotypes of the offsprings are
Attached Figure / Diagram
A
1 heterozygous smooth : 2 homozygous smooth : 1 wrinkled
B
1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled
C
2 homozygous smooth : 2 wrinkled
D
3 heterozygous smooth : 2 wrinkled
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The diagram above refers to a PUNNETT SQUARE used in predicting the probable genotypic and phenotypic ratios of a cross. looking at the diagram, we have the ratio
SS : Ss : sS : ss and from the question, we see the genotypic composition is;
1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled
Source: Myschool Past Questions Archive (Record #5306)
Biology
UTME / JAMB 1993
Adaptation & Evolution
Cold blooded animals are referred to as
A
poikilothermic
B
homothermic
C
polythermic
D
homeostatic
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 #5307)
Biology
UTME / JAMB 1993
Variety of Organisms & Classification of Living Things
Solution
Which of the following organisms has lost the pentadactyl limb structure?
A
Bat
B
Fish
C
Frog
D
Pigeon
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Pentadactyl limb structure is found in amphibians, humans, birds and reptiles. However, fishes have lost their pentadactyl limb structure.
Source: Myschool Past Questions Archive (Record #5310)
Biology
UTME / JAMB 1993
Variety of Organisms & Classification of Living Things
After circulation in the lungs, the blood returns to the left auricle through
A
1
B
4
C
5
D
6
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: Official Exam / Past Question Archive
Biology
UTME / JAMB 1993
Variety of Organisms & Classification of Living Things
Diagram
Solution
Which of the following is the correct order of the developmental stages?
Attached Figure / Diagram
A
1->2->3->4->5
B
5->1->3->2->4
C
2->1->3->4->5
D
5->3->2->1->4
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
.
Source: Myschool Past Questions Archive (Record #41356)
Biology
UTME / JAMB 1993
Respiration & Gaseous Exchange
Diagram
Stage 3 breathes
Attached Figure / Diagram
A
with the lungs
B
with the external gills
C
with the internal gills
D
through the skin
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 #41357)
Biology
UTME / JAMB 1993
Variety of Organisms & Classification of Living Things
Diagram
Blood is pumped into the right ventricle by the contraction of the auricle wall through
Attached Figure / Diagram
A
1
B
3
C
5
D
6
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 #41358)
Biology
UTME / JAMB 1993
Variety of Organisms & Classification of Living Things
Diagram
After circulation in the lungs, the blood returns to the left auricle through
Attached Figure / Diagram
A
1
B
4
C
5
D
6
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 #41360)
Mathematics
UTME / JAMB 1992
Sequences & Series (AP & GP)
Solution
What is the n-th term of the sequence 2, 6, 12, 20...?
A
4n - 2
B
2(3n - 1)
C
n2 + n
D
n2 + 3n + 2
medium Difficulty
Verified Correct Answer: Option C
Step-by-Step Mathematical Solution
Given that 2, 6, 12, 20...? the nth term = n\(^2\) + n
check: n = 1, u1 = 2
n = 2, u2 = 4 + 2 = 6
n = 3, u3 = 9 + 3 = 12
∴ n = 4, u4 = 16 + 4 = 20
Source: WAEC / JAMB / NECO Classroom Archive (Record #31322)
Mathematics
UTME / JAMB 1992
Binary Operations, Matrices & Determinants
Solution
If the binary operation \(\ast\) is defined by m \(\ast\) n = mn + m + n for any real number m and n, find the identity of the elements under this operation
A
e = 1
B
e = -1
C
e = -2
D
e = 0
medium Difficulty
Verified Correct Answer: Option D
Step-by-Step Mathematical Solution
Identity(e) : a \(\ast\) e = a
m \(\ast\) e = m...(i)
m \(\ast\) e = me + m + e
Because m \(\ast\) e = m
: m = me + m + e
m - m = e(m + 1)
e = \(\frac{0}{m + 1}\)
e = 0
Source: WAEC / JAMB / NECO Classroom Archive (Record #31329)
Mathematics
UTME / JAMB 1992
Trigonometry, Elevation & Bearings
Solution
X is a point due east of point Y on a coast: Z is another point on the coast but 6√3km due south of y.
If the distance XZ is 12Km. Calculate the bearing of Z from X
A
240o
B
210o
C
150o
D
60o
medium Difficulty
Verified Correct Answer: Option B
Step-by-Step Mathematical Solution
Using sinØ = \(\frac{6\sqrt3}{12}\) → \(\frac{\sqrt3}{2}\)
sinØ = \(\frac{\sqrt3}{2}\) or 60^\circ
The bearing of Z from X = [270 - 60]^\circ → 210^\circ
Source: WAEC / JAMB / NECO Classroom Archive (Record #31339)