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Biology
UTME / JAMB 1997
Nervous, Hormonal Coordination & Sense Organs
Solution
The part of the brain that regulates most biological cycles in humans is
A
olfactory lobe
B
optic lobe
C
medulla oblongata
D
pineal body
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
The pineal body (also known as the pineal gland) is a small endocrine gland which is located in the brain. It plays a crucial role in regulating various biological cycles. The primary function of the pineal gland is to secrete melatonin, a hormone that regulates the body's circadian rhythm (sleep-wake cycle) and plays a role in seasonal rhythms and other physiological processes.
Olfactory lobe receives and processes sensory information about odours, relaying this information to the brain for smell perception.
Optic lobe processes visual information, including spatial processing, colour perception, and object recognition. It also plays a role in coordinating eye and head movements.
Medula oblongata contains centers that regulate heart rate, blood pressure, and breathing, ensuring proper oxygen and carbon dioxide levels.
Source: Myschool Past Questions Archive (Record #5779)
Biology
UTME / JAMB 1997
Basic Ecological Concepts, Ecosystems & Biomes
The Southern Guinea Savanna differs from the Northern Guinea Savanna in that it has
A
lower rainfall and shorter grasses
B
less grasses and scattered trees
C
more rainfall and taller grasses
D
less arboreal and burrowing animals
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 #5785)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
After a heavy rainfall and the formation of a large pond, the most likely sequence of changes in the vegetation of the pond is
A
Euglena → water lily → Spirogyra → grass
B
water lily → Spirogyra →grass → Euglena
C
Spirogyra → Euglena → grass → water lily
D
Euglena → Spirogyra → water lily → grass
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 #5786)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
In a soil sample, the relative amouunts of the different soil particles can best be determined by the process of
A
filtration
B
centrifugation
C
precipitation
D
sedimentation
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 #5787)
Biology
UTME / JAMB 1997
Population Ecology, Habitats & Conservation
Which is the most important pollutant of the marine environment in Nigeria?
A
Insecticides
B
Sewage
C
Oil
D
Inorganic fertilizers
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 #5788)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
One of the most effective ways of controlling guinea worm is by
A
treating the disease
B
public enlightenment campaigns
C
accelerating rural developmnet
D
provision of portable drinking 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 #5789)
Biology
UTME / JAMB 1997
Cell Structure, Organization & Cell Division
During binary fission in lower organisms, the nucleus is known to undergo
A
mitosis
B
meiosis
C
fragmentation
D
mutation
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 #5790)
Biology
UTME / JAMB 1997
Variation & Genetics (Heredity)
Solution
One reason for the success of Mendel's work is that he
A
was the first to carry out research work on modern genetics
B
introduced quantitative and qualitative elements into his work
C
selected two characteristics only at a time for study
D
drew up his laws of inheritance based on his knowledge of chromosomes
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
Mendel's work was successful due to his methodical approach, focusing on single traits, using controlled crosses, and employing mathematical analysis to analyze his results, which allowed him to formulate the laws of inheritance. He took one or two characters, he formulated theoretical explanations for the interpretation of his results. He used statistical methods and laws of probability to analyze the results.
Source: Myschool Past Questions Archive (Record #5791)
Biology
UTME / JAMB 1997
Variation & Genetics (Heredity)
Solution
The homozygous condition HbsHbsresults in sickle cell anaemia whereas HbAHbs has the sickling trait. What is the probability that a couple with the sickling trait will give birth to one normal child?
A
1/2
B
1/4
C
1/8
D
none
medium Difficulty
Verified Correct Answer: Option B
Biological Concept & Syllabus Guide
The probability of a child inheriting the normal hemoglobin allele from two parents with sickle cell trait.
Given:
- Both parents have sickle cell trait (Hb A HbS)
- Sickle cell trait is a heterozygous condition, meaning the person has one normal allele(HbA), and one sickle cell allele(HbS).
Note that each parent can contribute either the Hb A or HbS allele and the child's genotype will be a combination of the alleles from each parent.
Using a Punnett square to determine the possible genotypes of the offspring as shown in the diagram above, the Punnett square will have the possible alleles of the first parent across the top and the possible alleles of the second parent along the side.
Identifying the genotype for a normal child, a normal child will have two copies of the normal allele, resulting in the genotype HbAA.
From the Punnett square, the probability of HbAA is \(\frac{1}{4}\)
The probability of a normal child HbAA is \(\frac{1}{4}\).
Source: Myschool Past Questions Archive (Record #5792)
Biology
UTME / JAMB 1997
Variation & Genetics (Heredity)
Solution
Which of the following characters is NOT sex-linked?
A
Albinism
B
Baldness
C
Haemophilia
D
Colour blindness
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The correct answer is A. Albinism.
Albinism is an autosomal recessive disorder, meaning it's caused by a mutation in a gene located on a non-sex chromosome (autosome). It's not sex-linked, although, some types of albinism are sex-linked. e.g ocular albinism.
The other options are sex-linked:
B. Baldness: Androgenetic alopecia, a common form of baldness, is influenced by genes on the X chromosome.
C. Haemophilia: Haemophilia A and B are caused by mutations in genes on the X chromosome.
D. Colour blindness: The most common forms of color blindness are caused by mutations in genes on the X chromosome.
So, albinism is the correct answer.
Source: Myschool Past Questions Archive (Record #5793)
Biology
UTME / JAMB 1997
Adaptation & Evolution
What combination of character should a prey develop to survive the environment of its predator?
A
Camouflag, well developed limbs and effective vision
B
Showy colour, big body and well developed limbs
C
Camouflage, big body and effective vision
D
Showy colour, well developed muscles and an acute sense of smell
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 #5794)
Biology
UTME / JAMB 1997
Adaptation & Evolution
Fossil records found in sedimentary rocks offer some explanation for the theory of evolution because
A
the deposits have remains of organisms characteristic of when they were formed
B
different strata have remains of organisms of the same kind
C
only organisms with strong parts are fossilized
D
most animal and plant fossils bear little resemblance to present day living specimens
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 #5795)
Biology
UTME / JAMB 1997
Adaptation & Evolution
Solution
Long neck in giraffe is used to illustrate the theory of
A
use and disuse
B
origin of species
C
origin of life
D
natural selection
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
The long neck of the girraffe is an example of Lamarck's theory of use and disuse.
Source: Myschool Past Questions Archive (Record #5796)
Biology
UTME / JAMB 1997
Variety of Organisms & Classification of Living Things
Water loss is regulated in plants and animals by both the
A
scales and the skin
B
scales and the hair
C
thick leaves and the feathers
D
leathery cuticle and the feathers
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 1997
Variety of Organisms & Classification of Living Things
Water loss is regulated in plants and animals by both the
A
scales and the skin
B
scales and the hair
C
thick leaves and the feathers
D
leathery cuticle and the feathers
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 #41391)