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Biology
UTME / JAMB 1983
Supporting Tissues & Skeletal System
The kidneys of all vertebrates act as osmoregulators. This means that they
A
keep the composition of the plasma constant
B
regulate osmotic processes
C
control the volume of blood entering the kidneys
D
decrease the osmotic pressure of the blood
E
increase the osmotic pressure of blood
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 #2386)
Biology
UTME / JAMB 1983
Nervous, Hormonal Coordination & Sense Organs
The movement of plant in response to external stimulus of no particular direction is
A
taxism
B
tropism
C
hyptotropic movement
D
nastic movement
E
phototropism
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 #2387)
Biology
UTME / JAMB 1983
Nervous, Hormonal Coordination & Sense Organs
Solution
The part of the mammalian brain responsible for maintaining balance is the
A
medulla oblongata
B
olfactory lobe
C
cerebellum
D
cerebrum
E
frontal lobe
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The part of the mammalian brain responsible for maintaining balance is the cerebellum.
Source: Myschool Past Questions Archive (Record #2388)
Biology
UTME / JAMB 1983
Reproduction in Plants & Animals
Solution
In the onion bulb, food is stored in the
A
stem
B
lateral buds
C
cotyledons
D
outer scale leave
E
leaf base
medium Difficulty
Verified Correct Answer: Option E
Biological Concept & Syllabus Guide
In an onion bulb, food is stored in the leaf bases, which are modified to become thick and fleshy. As the onion matures, synthesized food (primarily in the form of sugars) is sent down from the green foliage leaves to these bases, causing them to swell and form the characteristic concentric layers of the bulb.
A. stem: The stem of an onion is actually a very reduced, disc-like structure at the bottom of the bulb known as the basal plate. While it supports the leaves and roots, it is not the primary site of food storage.
B. lateral buds: These buds are located within the bulb and are responsible for producing new shoots or daughter bulbs for vegetative reproduction, but they do not store the bulk of the plant's food.
C. cotyledons: These are "seed leaves" used for nutrition during germination. In a mature onion bulb, the storage function has shifted to the modified leaf bases of the adult plant.
D. outer scale leave: Also known as scaly leaves, these are the dry, papery outer layers of the onion. Their primary function is to protect the inner fleshy layers from water loss and pests, rather than acting as the primary food storage.
Source: Myschool Past Questions Archive (Record #2389)
Biology
UTME / JAMB 1983
Reproduction in Plants & Animals
Groundnut is not really a 'nut' in the biological sense because
A
it is harvested from inside the ground
B
pericarp is not hard and tough
C
the fruit is not as hard as coconut
D
the fruit is not succulent
E
it is an achene
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 #2390)
Biology
UTME / JAMB 1983
Reproduction in Plants & Animals
What type of fruit is formed from a single flower having several carpels?
A
Multipe fruit
B
Simple fruit
C
Aggregrate fruit
D
Dehiscent fruit
E
Indehiscent fruit
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 #2391)
Biology
UTME / JAMB 1983
Basic Ecological Concepts, Ecosystems & Biomes
Solution
28 g soil sample was heated to a constant weight of 24 g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?
A
22.2
B
55.6
C
75.0
D
25.0
E
35.7
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Humus soil, a dark, organic material, is primarily composed of decayed plant and animal matter, and it contains essential nutrients like carbon, nitrogen, phosphorus, and sulphur.
To find the percentage of humus in the soil, we need to calculate the weight loss due to the burning of humus.
Initial weight loss (water removal): 28g - 24g = 4g
Weight loss due to burning of humus: 24g - 18g = 6g
Percentage of humus: \(\frac{Weight loss due to humus}{Initial weight}\times 100\)
= \(\frac{6}{28}\times 100\)
= 21.43% ≈ 22.2% (rounded to one decimal place)
Source: Myschool Past Questions Archive (Record #2392)
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
Which of the following diseases is NOT caused by a virus?
A
Rinderpest
B
Maize rust
C
Newcastle diseases
D
Swine fever
E
Cassava mosaic diseases
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 #2393)
Biology
UTME / JAMB 1983
Adaptation & Evolution
Solution
A centipede differs from a millipede by its
A
colour
B
numerous abdominal segment
C
paired legs on each abdominal segment
D
poison claws
E
cylindrical body
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
Millipedes have two sets of legs per segment positioned directly under their body with no poison claws. Centipedes have one set of legs per segment positioned on the side of their body, they have poison claws.
Source: Myschool Past Questions Archive (Record #2394)
Biology
UTME / JAMB 1983
Variation & Genetics (Heredity)
An organism having one pair of identical genes is
A
a heterozygote
B
a hybride
C
an allelomorph
D
a homozygote
E
a diploid
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 #2395)
Biology
UTME / JAMB 1983
Population Ecology, Habitats & Conservation
Plants which can survive in places where the water supply is limited are
A
bryophytes
B
mesophytes
C
xerophytes
D
hydrophytes
E
pteridophytes
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 #2396)
Biology
UTME / JAMB 1983
Variety of Organisms & Classification of Living Things
Banana, plantain and pineapple can be grouped together because they
A
produce small seeds
B
are multiple fruit
C
produce suckers
D
have runners
E
have bulbils
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 #2397)
Biology
UTME / JAMB 1983
Growth, Micro-organisms & Public Health
Solution
One disease NOT caused directly by bacteria is
A
malaria
B
tuberculosis
C
pneumonia
D
tetanus
E
cholera
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Malaria is not caused by bacteria; it is caused by a parasite of the genus Plasmodium, which is transmitted to humans through the bites of infected female Anopheles mosquitoes. These parasites invade red blood cells and cause the symptoms of malaria. Malaria is not a bacterial infection, and treating it with antibiotics will not be effective.
Source: Myschool Past Questions Archive (Record #2398)
Biology
UTME / JAMB 1983
Respiration & Gaseous Exchange
In what order do the following structure develop during the metamorphosis of the toad? 1. External gills 2. Internal gills 3. Forelimbs 4.Hindlimbs 5. Mouth
A
12345
B
15243
C
21345
D
53412
E
54321
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 #2399)
Biology
UTME / JAMB 1983
Digestive System & Feeding Mechanisms
The dental formula of a i(3/3); c(1/1); pm(4/4; m(2/3) = 42 represent that of a
A
rabbit
B
full grown man
C
young child
D
dog
E
sheep
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 #2406)