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Instruction
JAMB Biology 1990
JAMB (UTME)
Biology
1990
Q8951.Which of the following instruments is used for determining turbidity of water?
AThermometer
BSecchi Disc
CRain gauge
DHygrometer
Correct Answer: B
A Secchi disc is used to measure water turbidity.
JAMB (UTME)
Biology
1990
Q8952.Which of the following is NOT a characteristic of monocotyledonous plants?
AOccurrence of secondary thickening
BParallel venation
CScattered vascular bundles
DFloral parts arranged in threes
Correct Answer: A
Monocots do not undergo secondary thickening.
JAMB (UTME)
Biology
1990
Q8953.Hawk
A5-4-1-3-2
B2-3-1-4-5
C2-1-3-4-5
D2-3-4-5-1
Correct Answer: B
The correct food chain is: Mucuna (producer) → Grasshopper → Toad → Snake → Hawk.
JAMB (UTME)
Biology
1990
Q8954.In Rhizopus, carbohydrate is stored in the form of
Aglucose
Bparamylon
Cglycogen
Dstarch
Correct Answer: C
Fungi store carbohydrate as glycogen.
JAMB (UTME)
Biology
1990
Q8955.Which of the following statements about the rate of transpiration is INCORRECT? It is
Adependent on temperature
Baffected by changes in light intensity
Cunaffected by humidity
Ddependent on air movement
Correct Answer: C
Transpiration rate is affected by humidity (higher humidity reduces transpiration).
JAMB (UTME)
Biology
1990
Q8956.'Jointed skeleton' is absent in the
Acockroach
Bspider
Cmillipede
Dsnail
Correct Answer: D
Snails have a hydrostatic skeleton (soft body), not a jointed exoskeleton.
JAMB (UTME)
Biology
1990
Q8957.Which of the following statements about the dentition of man is INCORRECT? Man has
Amore molars than incisors
Bno diastema
Cthe same number of teeth on upper and lower jaws
Da total of thirty-two teeth
Correct Answer: A
Man has 8 incisors and 12 molars. The statement that man has more molars than incisors is correct, not incorrect. (Note: The question is poorly worded; the answer key was not in the source).
JAMB (UTME)
Biology
1990
Q8958.When a Spirogyra cell is immersed in a salt solution more concentrated than its cell sap, it
Aremains unchanged
Btakes up water and bursts
Cabsorbs a little water
Dloses water and shrivels
Correct Answer: D
In a hypertonic solution, water leaves the cell by osmosis, causing plasmolysis.
JAMB (UTME)
Biology
1990
Q8959.Urea is produced in the
Aliver
Bbladder
Cspleen
Dkidneys
Correct Answer: A
Urea is produced in the liver during deamination of amino acids.
JAMB (UTME)
Biology
1990
Q8960.What is the genotypic ratio of the F2 generation if members of F1 generation are allowed to self-pollinate?
A1 tall : 3 short
B3 tall : 1 short
C1 tall : 1 short
D4 shorts : 0 tall
Correct Answer: B
The F2 phenotypic ratio from a monohybrid cross is 3:1 (3 tall : 1 short).
JAMB (UTME)
Biology
1990
Q8961.The path taken by glucose from the ileum to the heart is
Glucose is absorbed into the hepatic portal vein, then passes through the liver to the hepatic vein, then to the vena cava, and finally to the heart.
Instruction
JAMB Biology 1991
JAMB (UTME)
Biology
1991
Q8962.The mouth parts of the housefly are adapted for
Alapping and sponging
Bsucking and chewing
Cpiercing and sucking
Dchewing and lapping
Correct Answer: A
The housefly has sponging mouthparts for lapping up liquids.
JAMB (UTME)
Biology
1991
Q8963.The male toad differs from the female by having
Avocal sacs
Bshorter hindlimbs
Clonger forelimbs
Dbulging eyes
Correct Answer: A
Male toads have vocal sacs used for calling during the breeding season.
JAMB (UTME)
Biology
1991
Q8964.Mosses, liverworts and ferns can be grouped together because they
Aare all aquatic plants
Ball grow in deserts
Care seedless plants
Dhave undifferentiated plant bodies
Correct Answer: C
Mosses, liverworts, and ferns are all seedless plants that reproduce by spores.
JAMB (UTME)
Biology
1991
Q8965.Spirogyra and Mucor can be grouped together as Thallophyta because
Athey are unicellular organisms
Btheir spores could be dispersed by wind
Cthey are capable of living independent lives
Dtheir bodies are made up of thallus
Correct Answer: D
Thallophytes have undifferentiated plant bodies called thalli.
JAMB (UTME)
Biology
1991
Q8966.Which of the following invertebrates does NOT possess antennae?
ACentipede
BCrustacean
CMillipede
DSpider
Correct Answer: D
Spiders (arachnids) do not have antennae.
JAMB (UTME)
Biology
1991
Q8967.Which of the following is INCORRECT? The prothallus of a fern
Ais a flattened heart-shaped structure
Bis green because its cells contain chloroplasts
Cis the dominant plant
Dbears the sexual organs
Correct Answer: C
The prothallus (gametophyte) is small and short-lived; the sporophyte is the dominant generation in ferns.
JAMB (UTME)
Biology
1991
Q8968.Which of the following cell constituents is NOT common in both plants and animals?
AMitochondria
BChloroplasts
CRibosomes
DGolgi apparatus
Correct Answer: B
Chloroplasts are found only in plant cells, not in animal cells.
JAMB (UTME)
Biology
1991
Q8969.The character-producing factors in living organisms are
Achromomeres
Balleles
Cchromatids
Dgenes
Correct Answer: D
Genes are the units of heredity that determine characteristics.
JAMB (UTME)
Biology
1991
Q8970.A mixture of mercurous and mercuric nitrates is added to a food substance. A white precipitate is formed which on gentle heating turns red. The food substance is
Aprotein
Boil
Ccarbohydrate
Dfat
Correct Answer: A
This is Millon's test for proteins. The white precipitate turns red on heating.
JAMB (UTME)
Biology
1991
Q8971.The mammalian organ through which nourishment and oxygen diffuse into a developing embryo is called
Aamnion
Bchorion
Cumbilical cord
Dplacenta
Correct Answer: D
The placenta is the organ through which nutrients and oxygen pass from mother to fetus.
JAMB (UTME)
Biology
1991
Q8972.Fig 1 represents a quill feather. The structure labelled "M" is the
Aquill
Brachis
Csuperior umbilicus
Dinferior umbilicus
Correct Answer: D
The inferior umbilicus is the opening at the base of the quill.
JAMB (UTME)
Biology
1991
Q8973.Osmosis can be defined as the movement of
Amolecules from solution of high concentration to low concentration
Bmolecules from solution of low concentration to high concentration
Cwater from solution of high concentration to low concentration
Dwater across a semipermeable membrane from solution of low concentration to high concentration
Correct Answer: D
Osmosis is the movement of water across a semipermeable membrane from a region of low solute concentration to high solute concentration.
JAMB (UTME)
Biology
1991
Q8974.Which of the following statements is NOT true of enzymes? They
Aare proteins
Bneed cofactors to activate them
Care sensitive to hydrogen ion concentration
Dcan withstand high temperatures
Correct Answer: D
Enzymes are denatured by high temperatures.
JAMB (UTME)
Biology
1991
Q8975.The dorsal and anal fins of fish are used for
Aupward movements
Bcontrolling rolling movements
Cdownward movements
Dsteering
Correct Answer: B
The dorsal and anal fins prevent rolling and stabilize the fish.
JAMB (UTME)
Biology
1991
Q8976.Exoskeleton is NOT found in the
Amaggot
Bmosquito larva
Cearthworm
Dcaterpillar
Correct Answer: C
Earthworms have a hydrostatic skeleton, not an exoskeleton.
JAMB (UTME)
Biology
1991
Q8977.Blood clotting is initiated by
Aleucocytes
Bplatelets
Chaemolymph
Dhaemoglobin
Correct Answer: B
Platelets release factors that initiate blood clotting.
JAMB (UTME)
Biology
1991
Q8978.Pepsin is a digestive enzyme which breaks
Acellulose into glucose molecules
Bcarbohydrates into simple sugars
Cprotein into peptones
Dfats into glycerol and fatty acids
Correct Answer: C
Pepsin breaks down proteins into peptones in the stomach.
JAMB (UTME)
Biology
1991
Q8979.Anaerobic respiration in yeast produces
Acarbon dioxide and ethanol
Bcarbon dioxide and water
Ccarbon dioxide and oxygen
Dcarbon dioxide and glucose
Correct Answer: A
Yeast ferments glucose to ethanol and carbon dioxide anaerobically.
JAMB (UTME)
Biology
1991
Q8980.Underground stems which grow horizontally through the soil are
Abulbs
Brhizomes
Crunners
Dcorms
Correct Answer: B
Rhizomes are horizontal underground stems.
JAMB (UTME)
Biology
1991
Q8981.A man with a normal haemoglobin (AA) marries a woman who has sickle-cell haemoglobin (SS). They have a child who has sickle-cell trait. Which of the following genotypes could be associated with the child's haemoglobin?
AAA
BOO
CAO
DAS
Correct Answer: D
The child inherits A from father and S from mother, giving genotype AS (sickle-cell trait).
JAMB (UTME)
Biology
1991
Q8982.In a Biuret test, some protein was mixed with sodium hydroxide solution. Which of the following chemicals should be added to the mixture for a positive result?
AMercuric nitrate
BCopper sulphate
CMercuric chloride
DSodium carbonate
Correct Answer: B
Biuret test uses copper sulphate solution, which gives a purple colour with proteins.
JAMB (UTME)
Biology
1991
Q8983.The removal of a man's pancreas by surgical operation can affect only the digestion of
Astarch
Bstarch, protein and fats
Coils and fats
Dproteins
Correct Answer: B
The pancreas produces amylase (starch), trypsin (protein), and lipase (fats).
JAMB (UTME)
Biology
1991
Q8984.The parts used by tapeworm to fasten itself to the host's intestine are the
Aneck and suckers
Bhooks and suckers
Crostellum and suckers
Drostellum, hooks and suckers
Correct Answer: D
The scolex of Taenia has a rostellum, hooks, and suckers for attachment.
JAMB (UTME)
Biology
1991
Q8985.The young chick is formed from
A3
B3 and 4
C1, 3 and 5
D2
Correct Answer: D
The blastoderm (labelled 2) develops into the chick.
JAMB (UTME)
Biology
1991
Q8986.Which parts provide food for the developing chick?
A2 and 3
B4 and 5
C3 and 4
D2 and 5
Correct Answer: C
The yolk (3) and albumen (4) provide food for the developing chick.
JAMB (UTME)
Biology
1991
Q8987.Which of the following types of vertebra occur in equal numbers in the rabbit, rat and man?
ACaudal
BThoracic
CLumbar
DCervical
Correct Answer: D
All mammals have 7 cervical vertebrae.
JAMB (UTME)
Biology
1991
Q8988.Which of the following statements is NOT true of the piliferous layer of a root? It
Ahas a very thin cuticle
Bis the outermost layer of the cortex
Cmay bear root hairs
Dis replaced by cork in old roots
Correct Answer: B
The piliferous layer is the outermost layer of the root (epidermis), not the cortex.
JAMB (UTME)
Biology
1991
Q8989.A flowering plant is monoecious if
Athe androecium is found on one plant
Bthe gynoecium is monocarpous
Cit produces unisexual organs
Dthe gynoecium and androecium are on the same plant
Correct Answer: D
Monoecious plants have both male and female reproductive organs on the same plant.
JAMB (UTME)
Biology
1991
Q8990.How many nuclei are found in a pollen tube during fertilization?
A2
B3
C5
D6
Correct Answer: B
The pollen tube contains the tube nucleus and two male gamete nuclei (3 nuclei total).
JAMB (UTME)
Biology
1991
Q8991.Which of the following is NOT a waste product of plants?
ATannins
BOxygen
CCarbon dioxide
DSap
Correct Answer: D
Sap is a transport fluid, not a waste product.
JAMB (UTME)
Biology
1991
Q8992.If an animal is very active and has good muscular control, it is likely to have well-developed
Aolfactory lobes
Bcerebral hemispheres
Coptic lobes
Dcerebellum
Correct Answer: D
The cerebellum controls muscular coordination and balance.
JAMB (UTME)
Biology
1991
Q8993.Which of the following adaptations is NOT concerned with the flight of birds?
AStreamlined shape
BPresence of powerful muscles
CReduced body weight
DWebbed feet
Correct Answer: D
Webbed feet are an adaptation for swimming, not flight.
JAMB (UTME)
Biology
1991
Q8994.The transect method can be used in ecology to show the
Anumber of plants and animals in a habitat
Bpopulation of a plant species
Cdistribution of organisms along a line
Dheights of trees in a section of a forest
Correct Answer: C
A transect is a line along which organisms are sampled to show distribution.
JAMB (UTME)
Biology
1991
Q8995.Asexual reproduction does NOT occur in
AMucor, Spirogyra and Paramecium
BPenicillium, Paramecium and Amoeba
CMucor, Rhizopus and Penicillium
DAmoeba, Spirogyra and Mucor
Correct Answer: A
All the listed organisms can reproduce asexually. Rhizopus, Ascaris and Amoeba: Ascaris reproduces sexually only. (Note: The question is flawed; no correct option is provided.)
JAMB (UTME)
Biology
1991
Q8996.Fehling's solution will readily change colour from blue to a reddish colour when it is
Amixed with sugar solution in the cold
Bwarmed by itself
Cmixed with reducing sugar in the cold
Dwarmed with a solution of reducing sugar
Correct Answer: D
Fehling's solution gives a red precipitate when warmed with a reducing sugar.
JAMB (UTME)
Biology
1991
Q8997.Normally the flow of blood is NEVER from
Aartery to arterioles
Barterioles to capillaries
Ccapillaries to venules
Darterioles to the artery
Correct Answer: D
Blood flows from arteries to arterioles, not the reverse.
JAMB (UTME)
Biology
1991
Q8998.Heat produced in tissue respiration in plants is
Aa chemical form of energy
Bthe only form of energy
Cthe main form of energy
Da useful form of energy
Correct Answer: A
Heat is a waste product of respiration. (Note: The correct answer is "a waste form of energy" but E is missing; the intended answer is E).
JAMB (UTME)
Biology
1991
Q8999.The axial skeleton of a mammal does not include the bones of the
Askull
Btail
Climbs
Dback
Correct Answer: C
The axial skeleton includes the skull, vertebral column, and rib cage. Limbs are part of the appendicular skeleton.
JAMB (UTME)
Biology
1991
Q9000.Blood is exposed to air
A4, 3, 1, 2
B3, 1, 2, 4
C2, 1, 3, 4
D1, 3, 2, 4
Correct Answer: A
Blood exposed to air → fibrinogen converts to fibrin → fibrin network forms → RBCs caught and clot forms.