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Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
Etiolation is caused by the influence of
A
minerals salt
B
water
C
carbondioxide
D
light
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 #4528)
Biology
UTME / JAMB 1990
Supporting Tissues & Skeletal System
Muscles are indirectly attached to bones by means of
A
ligaments
B
membranes
C
tendons
D
sutures
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 #4529)
Biology
UTME / JAMB 1990
Nervous, Hormonal Coordination & Sense Organs
During mammalian embryo development, large amounts of oestrogen and progesterone are produced in the
A
umbilical cord
B
amnion
C
placenta
D
amniotic fluid
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 #4530)
Biology
UTME / JAMB 1990
Reproduction in Plants & Animals
Fruits which develop without fertilization are described as
A
simple
B
pathencorpic
C
aggregate
D
compound
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 #4531)
Biology
UTME / JAMB 1990
Reproduction in Plants & Animals
Diagram
Solution
The type of placentation shown in the figure above is a
Attached Figure / Diagram
A
parietal
B
marginal
C
axile
D
free-central
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Parietal placentation is a type of placentation where ovules are attached to the inner walls of the ovary, or on slight outgrowths of the wall forming incomplete partitions within a compound ovary. In parietal placentation, the ovules develop on the inner walls of the ovary, rather than being attached to a central axis or column.
Source: Myschool Past Questions Archive (Record #4532)
Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
The elephant grass is propagated vegetatively by means of
A
corms
B
bubils
C
suckers
D
stolons
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 #4533)
Biology
UTME / JAMB 1990
Nervous, Hormonal Coordination & Sense Organs
The part of the ear that is concerned with balance is the
A
semi-circular canals
B
incus
C
malleus
D
Eustachian tube
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 #4534)
Biology
UTME / JAMB 1990
Variation & Genetics (Heredity)
Solution
In organism where the 2nd number of chromosomes is 16, the number of chromosomes in each gamete will be
A
32
B
16
C
8
D
4
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
A gamete is a haploid sex cell of an organism which is reproduced sexually. They contain half the number of chromosomes in an organism.
no of chromosomes = 16, hence, no of chromosomes in the gamete = \(\frac{1}{2}\) of 16 = 8
Source: Myschool Past Questions Archive (Record #4535)
Biology
UTME / JAMB 1990
Variation & Genetics (Heredity)
What will be the result of the first filial generation (F1) and the second filial generation (F2) of a mono-hybrid cross between pure line normal-winged Drosophilia flies and pure line short-winged flies, if the gene for the normal wing is dominant?
A
F1 flies all short-winged and F2 flies all normal-winged
B
F1 flies all normal and F2 flies all short-winged
C
F1 flies all short-winged and three-quarters of F2 flies are short-winged
D
F1 flies all normal-winged and three-quarters of F2 flies are normal-winged
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 #4540)
Biology
UTME / JAMB 1990
Cell Structure, Organization & Cell Division
Diagram
Solution
What stage during cell division is represented in the figure above?
Attached Figure / Diagram
A
Prophase
B
Metaphase
C
Anaphase
D
Telophase
medium Difficulty
Verified Correct Answer: Option C
Biological Concept & Syllabus Guide
The stage during the mitotic cell division represented in the question is Anaphase. This is the shortest stage of mitosis.
During anaphase, the sister chromatids separate at the centromeres and are pulled to opposite poles of the cell by spindle fibers, ensuring each daughter cell receives a complete set of chromosomes. The separated sister chromatids, now referred to as daughter chromosomes, are pulled towards opposite poles of the cell by the spindle fibers attached to their kinetochores.
After anaphase, the cell enters telophase where the nuclear envelope reforms around each set of chromosomes, and the cell divides into two daughter cells through cytokinesis.
Source: Myschool Past Questions Archive (Record #4541)
Biology
UTME / JAMB 1990
Growth, Micro-organisms & Public Health
Solution
An individual in the AB blood group is a universal recipient for blood donation because
A
all the red blood cells do not carry antigen
B
all the red blood cells carry antigen
C
all the red blood cells carry antigen
D
there are no anti-A and anti-B antibodies in the serum
medium Difficulty
Verified Correct Answer: Option D
Biological Concept & Syllabus Guide
People with type AB blood are universal recipients because they don't have antibodies to A or B antigens, so they won't reject blood from any other blood type. They have both A and B antigens, so they don't produce antibodies to those antigens.
Source: Myschool Past Questions Archive (Record #4543)
Biology
UTME / JAMB 1990
Variation & Genetics (Heredity)
Solution
Haemophilia results from the mutation of the genes
A
in the sex chromosome
B
which control skin colour
C
which control the mechanism for blood-clotting
D
which control the formation of haemoglobin
medium Difficulty
Verified Correct Answer: Option A
Biological Concept & Syllabus Guide
Hemophilia is a bleeding disorder where the blood takes much longer to clot than normal. This is because the genes responsible for producing certain clotting factors, like factor VIII (Hemophilia A) or factor IX (Hemophilia B), are mutated. Haemophilia results from mutations in genes on the X chromosome, which are responsible for producing blood clotting factors.
Source: Myschool Past Questions Archive (Record #4545)
Biology
UTME / JAMB 1990
Basic Ecological Concepts, Ecosystems & Biomes
In a savanna ecosystem the abiotic factors include
A
legumes, temperature and sandy soil
B
water, temperature and soil
C
minerals, oxygen and reptiles
D
water, soil and grasses
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 #4546)
Biology
UTME / JAMB 1990
Variety of Organisms & Classification of Living Things
Diagram
Which of the following is an omnivore?
Attached Figure / Diagram
A
Praying mantis
B
Hawk
C
Mouse
D
Grasshopper
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 #4548)
Biology
UTME / JAMB 1990
Basic Ecological Concepts, Ecosystems & Biomes
which of the organisms will have the lowest population in an ecosystem?
A
Hawk
B
Cowpea
C
Praying mantis
D
Mouse
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 #4549)