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Biology
UTME / JAMB 1983
Digestive System & Feeding Mechanisms
Solution
Which of the following statements about the dentition of man is INCORRECT ? man has
A
More molars than incisors
B
No diastema
C
The same number of teeth on upper and lower jaw
D
A total of thirty-two teeth
E
A total of six molars
medium Difficulty
Verified Correct Answer: Option E
Biological Concept & Syllabus Guide
Consider the dentition formula in man : i = \(\frac{2}{2}\); c = \(\frac{1}{1}\); p = \(\frac{2}{2}\); m = \(\frac{3}{3}\) = 16 x 2 = 32
where i = incisors, c = canine, p = premolars, m = molars
Diastema refers to a gap or space between the teeth. These spaces can form anywhere in the mouth, but are sometimes noticeable between the two upper front teeth. This condition affects both adults and children. In children, gaps may disappear once their permanent teeth grow in, hence some humans have diastema, although it is not a typical characteristics of human dentition.
Consequently, the correct answer is option E, since humans have a total number of 12 molars not 6, when calculated in relative to the total number of 32.
Source: Myschool Past Questions Archive (Record #2555)
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
When spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it
A
Remains unchanged
B
Takes up water an burst
C
Absorbs a little water
D
Loses water and shrivels
E
Becomes turgid
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 #2556)
Biology
UTME / JAMB 1983
Excretion & Homeostasis
Urea is produced in the
A
Liver
B
Bladder
C
Spleen
D
Kidneys
E
Gall bladder
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 #2558)
Biology
UTME / JAMB 1983
Variation & Genetics (Heredity)
Solution
What is the genetic ratio of the F2 generation if members of F generation are allowed to self-pollinate?
A
1 tall : 3 short
B
3 tall : 1 short
C
1 tall : 1 short
D
4 short : 0 tall
E
4 tall : 0 short
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
If members of the F1 generation are allowed to self-pollinate, the genetic ratio in the F2 generation will be 1:2:1 (homozygous dominant: heterozygous: homozygous recessive) for a monohybrid cross, meaning a single gene trait is being studied.
Explanation:
F1 generation:
When two homozygous parents with contrasting traits are crossed, the F1 generation will all be heterozygous, exhibiting the dominant phenotype.
Self-pollination of F1:
When these F1 heterozygotes self-pollinate, the offspring in the F2 generation will segregate the alleles according to Mendel's law of segregation, resulting in a 1:2:1 genotypic ratio.
The genetic ratio of the F2 shows that there will be 3 tall and 1 short offspring plants.(See diagram above)
Source: Myschool Past Questions Archive (Record #2560)
Biology
UTME / JAMB 1983
Digestive System & Feeding Mechanisms
The path taken by glucose from the ileum to the heart is
A
Ileum →hepatic portal vein →hepatic artery → vena cava → heart
B
Ileum → hepatic portal artery →hepatic artery → vena cava → heart
C
Ileum → hepatic portal vein → vena cava → heart
D
Ileum → hepatic vein → vena cava → heart
E
Ileum → hepatic portal vein → hepatic vein → vena cava → heart
medium Difficulty
Verified Correct Answer: Option E
Biological Concept & Syllabus Guide
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #2561)
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
Diagram
Which of the following features can be used to identify the figure above
Attached Figure / Diagram
A
Position of 7
B
its circular nature
C
Number of 5
D
Presence of 3
E
width of 2
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 #15535)
Biology
UTME / JAMB 1983
Nutrition in Plants & Animals (Photosynthesis & Food Substances)
Diagram
The main function of 6 is to
Attached Figure / Diagram
A
separate 5 from 7
B
produce more of 5 and 7
C
produce cork
D
translocate water and mineral salt
E
conduct carbondioxide to the other plant
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 #15536)
Biology
UTME / JAMB 1983
Supporting Tissues & Skeletal System
Diagram
Solution
The main function of 4 is to
Attached Figure / Diagram
A
surround inner tissues
B
produce cork
C
produce root hairs
D
produce lateral roots
E
produce more of 3
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The part labelled 4 is the pericycle (See diagram above).
The major function of the pericycle in the stem is to surround and protect the inner tissues, specifically the vascular bundles (xylem and phloem). The pericycle is part of the vascular system and helps to support and protect these vital tissues.
Source: Myschool Past Questions Archive (Record #15537)
Biology
UTME / JAMB 1983
Reproduction in Plants & Animals
Diagram
Which of the labelled part in the figure above will develop into new bulb?
Attached Figure / Diagram
A
1
B
4
C
2
D
3
E
5
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 #15538)
Biology
UTME / JAMB 1983
Cell & Its Environment (Diffusion, Osmosis & Transport)
Which of the following will not allow osmosis to take place
A
pig's bladder
B
cellophane
C
parchment paper
D
transparent polythene
E
cow's bladder
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 1983
Cell & Its Environment (Diffusion, Osmosis & Transport)
If an isolated living cell is left in distilled water for two hours, it is likely to
A
lose some of its water to the surrounding water
B
lose all of its water to the surrounding water
C
reproduce by binary fission
D
become more turgid
E
die due to excess water
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 #40483)
Biology
UTME / JAMB 1983
Cell & Its Environment (Diffusion, Osmosis & Transport)
Which of the following will not allow osmosis to take place
A
pig's bladder
B
cellophane
C
parchment paper
D
transparent polythene
E
cow's bladder
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 #40484)
Mathematics
UTME / JAMB 1982
Fractions, Decimals, Percentages & Approximations
Diagram
Solution
The diagram is the distance time graph of a vehicle. Find its average speed in kilometers per hour during the journey
Attached Figure / Diagram
A
155km/hr
B
50km/hr
C
40km/hr
D
124km/hr
E
84km/hr
medium Difficulty
Verified Correct Answer: Option E
Step-by-Step Mathematical Solution
Distance = 155 - 50 = 105km
Time = 75mins
= \(\frac{75}{60}\)hr = \(\frac{5}{4}\)hr
Average speed = \(\frac{Distance}{time}\) = \(\frac{105}{\frac{5}{4}}\)
= \(\frac{105 \times 4}{5}\)
= 84km\h
Source: WAEC / JAMB / NECO Classroom Archive (Record #32759)
Physics
UTME / JAMB 1982
Calorimetry, Latent Heat & Change of State
Solution
A hot metal ball is suspended in the open air. As it cools it loses heat by?
A
conduction only
B
convection only
C
radiation only
D
conduction and convection
E
convection and evaporation
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Convection occurs when heat is carried away from your body via moving air. If the surrounding air is cooler, the air will absorb heat and rise.
As the warmed air rises, cooler air moves in to take its place and absorb more warmth.
Source: WAEC / JAMB / NECO Classroom Archive (Record #28936)
Physics
UTME / JAMB 1982
Temperature, Thermometry & Thermal Expansion
Diagram
Solution
The water manometer above is measuring the pressure of gas supply. if the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury what is the total pressure of the gas supply in cm of water
Attached Figure / Diagram
A
67cm
B
73cm
C
949cm
D
952cm
E
955cm
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Atmospheric pressure = 70cmHg (which is the height of mecury)
pressure = pgh = pwghw
Where
Pw = density of water
hw = height of water
ph = pwhw
13.6*70 = 1*hw
hw = 952cm
Pressure of gas in cm of water = 952 + 3 = 955cm
Source: WAEC / JAMB / NECO Classroom Archive (Record #41620)