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Biology
UTME / JAMB 1986
Transport System in Plants & Animals
Solution
A major limitation in the use of the potometer for measuring the rate of transpiration is that
A
it is made of breakable glass materials
B
it measures the rate of water intake
C
it measure the rate of water loss throuh the stern only
D
the movement of the air buble in the potometer cannot be timed accurately
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
A potometer does not directly measure the amount of water vapour lost through the leaves (transpiration). Instead, it measures the rate of water uptake by a plant shoot. This is considered a major limitation because not all the water absorbed by the plant is transpired.
Source: Myschool Past Questions Archive (Record #3413)
Biology
UTME / JAMB 1986
Respiration & Gaseous Exchange
Solution
Which of the following statement is NOT correct with respect to inhalation in mammals? The
A
intercostal muscles contract
B
diaphragm is raised
C
ribs are raised
D
Pressure of the thoracic cavity decreases
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
During inhalation in mammals, the intercostal muscles, specifically the external intercostal muscles, contract, causing the rib cage to expand and move outward, which increases the volume of the thoracic cavity and facilitates air intake; the ribs are raised and move outwards, expanding the chest cavity to allow air to rush into the lungs.
Also, during inhalation in mammals, the pressure within the thoracic cavity decreases as the volume of the cavity increases. This pressure change, driven by the contraction of the diaphragm and intercostal muscles, causes air to rush into the lungs.
During inhalation in mammals, the diaphragm contracts and flattens, moving downwards, rather than being raised, to increase the volume of the chest cavity and facilitate air intake.
Among the given options, the only statement that is incorrect states that during inhalation in mammals, diaphragm is raised instead of stating that it contacts and flattens in order to increasethe volume of chest cavity as well as facilitating the intake of air. Thus, option B is the correct answer.
Source: Myschool Past Questions Archive (Record #3414)
Biology
UTME / JAMB 1986
Variety of Organisms & Classification of Living Things
The equation that can be used to summarize the process of anaerobic breakdown of sugar is
A
C2H12O6 2C2H5OH + 2CO2
B
6Co2 + 6H2O C6H12O6 + 6O2
C
C6H12O6 + 6O2 6CO2 + 6H2O + enegy
D
C6H12O6 2C2H5OH + 2CO2 + energy
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 #3416)
Biology
UTME / JAMB 1986
Growth, Micro-organisms & Public Health
If a person is bitten by a snake on the leg, it is advisable for him to
A
keep moving so that the venom will ooze out with bleeding
B
Wash the wound with water containing antiseptic
C
bandage the wound so that germs do not get in through it
D
Keep still and apply a tourniquet above the wound
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 #3417)
Biology
UTME / JAMB 1986
Excretion & Homeostasis
Deamination occurs in the
A
kidney
B
pancreas
C
spleen
D
liver
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 #3418)
Biology
UTME / JAMB 1986
Excretion & Homeostasis
In the mammalian skin, melanin and keratin are contained in the
A
sebaceous gland
B
sweat gland
C
subcubaneous layer
D
malpighian layer
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 #3419)
Biology
UTME / JAMB 1986
Supporting Tissues & Skeletal System
Two main distinguishing features of the cervical vertebra are the presence of
A
short neural spine and vertebraterial canal
B
prozygapophysis and cervical ribs
C
large centrum and cervical ribs
D
vertebraterial canal and large centrum
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 #3420)
Biology
UTME / JAMB 1986
Nervous, Hormonal Coordination & Sense Organs
Solution
Nastic movement is
A
response to light stimulus
B
non-directional
C
directional
D
response to internal stimulus
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Nastic movements are non-directional responses to stimuli (e.g. temperature, humidity, light irradiance), and are usually associated with plants. The movement can be due to changes in turgor or changes in growth.
Source: Myschool Past Questions Archive (Record #3421)
Biology
UTME / JAMB 1986
Reproduction in Plants & Animals
Solution
Gestation in mammals is the period
A
required for growth after birth
B
between the formation of the foetus and birth
C
of development from zygote to birth
D
before the formation of the zygote
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
In mammals, the gestation period is a period of development from the zygote (fertilized egg) to birth. It encompasses the entire time from conception to the birth of the offspring, during which the embryo or fetus grows and develops inside the mother's uterus.
Source: Myschool Past Questions Archive (Record #3426)
Biology
UTME / JAMB 1986
Variation & Genetics (Heredity)
If a woman who is a carrier of sickle cell trait (AS) married a man who is a sickler (SS) and they had four children, how many of them would be normal?
A
Three
B
Two
C
One
D
None
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 #3431)
Biology
UTME / JAMB 1986
Variation & Genetics (Heredity)
Which of the following is an example of discontinuous variation?
A
skin colouration
B
left handedness
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 #3433)
Biology
UTME / JAMB 1986
Nervous, Hormonal Coordination & Sense Organs
The hormones which regulates the amount of glucose in the blood is called
A
adrenalin
B
auxin
C
insulin
D
thyroxine
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 #3435)
Biology
UTME / JAMB 1986
Nervous, Hormonal Coordination & Sense Organs
An instrument that can be used to demonstrate phototropism and geotropism in plants is the
A
auxanometer
B
potometer
C
klinostat
D
photometer
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 #3436)
Biology
UTME / JAMB 1986
Basic Ecological Concepts, Ecosystems & Biomes
In an ecosystem, animals which feed directly on plants are called
A
secondary consumers
B
primary consumers
C
producers
D
predators
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 #3438)
Biology
UTME / JAMB 1986
Basic Ecological Concepts, Ecosystems & Biomes
Solution
In an agricultural ecosystem, the biotic component consists of
A
crop, pest and beneficial insects
B
crops, temperature and humidity
C
pests, beneficial insects and water
D
crops, water and soil
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Biotic factors are defined as the living components or factors that affect an ecosystem or other organisms living in that ecosystem. e.g. biotic factors may also include parasites, predators, crops, prey, competitors, etc.
Source: Myschool Past Questions Archive (Record #3658)