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Instruction
JAMB Chemistry 2004
JAMB (UTME)
Chemistry
2004
Q8901.An electron can be added to a halogen atom to form a halide ion with
A8 valence electrons
B7 valence electrons
C2 valence electrons
D3 valence electrons
Correct Answer: A
Halogen atoms have 7 valence electrons. When they gain 1 electron, they form a halide ion with 8 valence electrons (octet).
JAMB (UTME)
Chemistry
2004
Q8902.According to Charles' law, the volume of a gas becomes zero at
A-100°C
B-273°C
C-373°C
D0°C
Correct Answer: B
According to Charles's law, the volume of a gas theoretically becomes zero at absolute zero (-273°C).
JAMB (UTME)
Chemistry
2004
Q8903.When steam is passed over red-hot carbon, the substances produced are
Ahydrogen and carbon (II) oxide
Bhydrogen and carbon (IV) oxide
Chydrogen and trioxocarbonate (IV) acid
Dhydrogen, oxygen and carbon (IV) oxide
Correct Answer: A
C + H₂O → CO + H₂. The products are carbon(II) oxide (CO) and hydrogen gas.
JAMB (UTME)
Chemistry
2004
Q8904.Aluminum hydroxide is used in the dyeing industry as a
Adye
Bdispersant
Csalt
Dmordant
Correct Answer: D
Aluminium hydroxide is used as a mordant in dyeing to fix dyes to fabrics.
JAMB (UTME)
Chemistry
2004
Q8905.Transition metals possess variable oxidation states because they have
Aelectrons in the s orbitals
Belectrons in the d orbitals
Cpartially filled p orbitals
Da variable number of electrons in the p orbitals
Correct Answer: B
Transition metals have partially filled d-orbitals, which allow them to lose different numbers of electrons and exhibit variable oxidation states.
JAMB (UTME)
Chemistry
2004
Q8906.The allotrope of carbon used in the decolorization of sugar is
Asoot
Blampblack
Cgraphite
Dcharcoal
Correct Answer: D
Charcoal (activated charcoal) is used to decolorize sugar because of its high adsorption capacity.
JAMB (UTME)
Chemistry
2004
Q8907.Carbon is tetravalent because
Athe 2s and 2p atomic orbitals hybridized
Ball the atomic orbitals of carbon have equivalent
Cit has four valence electrons
Dthe electrons in both the 2s and 2p orbitals are equivalent
Correct Answer: A
In carbon, one 2s electron is promoted to a 2p orbital, and then the one 2s and three 2p orbitals hybridize to form four equivalent sp³ hybrid orbitals. This allows carbon to form four bonds (tetravalent).
JAMB (UTME)
Chemistry
2004
Q8908.Sodium metal is always kept under oil because it
Ais reduced by atmospheric nitrogen
Breadily reacts with water
Creacts with oxygen and carbon (IV) oxide
Dreacts vigorously on exposure to air
Correct Answer: B
Sodium reacts vigorously with moisture in the air. It is kept under oil to prevent contact with water vapour and oxygen.
JAMB (UTME)
Chemistry
2004
Q8909.Alloys are best prepared by
Acooling a molten mixture of the metals
Breducing a mixture of their metallic oxides
Carc-welding
Delectroplating
Correct Answer: A
Alloys are best prepared by melting the constituent metals together and then cooling the molten mixture.
JAMB (UTME)
Chemistry
2004
Q8910.Sulphur (IV) oxide bleaches by
Aoxidation
Breduction
Chydration
Dadsorption
Correct Answer: B
Sulphur(IV) oxide bleaches by reduction. It removes oxygen from coloured substances, converting them to colourless compounds.
JAMB (UTME)
Chemistry
2004
Q8911.Which of the following gases can be collected by the method of downward delivery?
AOxygen
BHydrogen
CChlorine
DAmmonia
Correct Answer: C
Downward delivery is used for gases that are heavier than air (denser than air). Chlorine (Cl₂) is denser than air.
Instruction
JAMB Biology 1990
JAMB (UTME)
Biology
1990
Q8912.Root hairs are developed from the
Aroot apex
Bepidermis of roots
Cvascular bundles
Dendodermis
Correct Answer: B
Root hairs are unicellular outgrowths of the epidermal cells of roots.
JAMB (UTME)
Biology
1990
Q8913.Which of the following features can be used to identify Fig 1 (cross-section of a dicot plant)?
APosition of 7
BIts circular nature
CNumber of 5
DPresence of 3
Correct Answer: D
The presence of vascular bundles arranged in a ring (labelled 3) identifies it as a dicot stem/root.
JAMB (UTME)
Biology
1990
Q8914.The main function of 6 (vascular bundle) is to
Aseparate 5 from 7
Bproduce more of 5 and 7
Cproduce cork
Dtranslocate water and mineral salt
Correct Answer: D
The vascular bundle (xylem and phloem) transports water, mineral salts, and food.
JAMB (UTME)
Biology
1990
Q8915.The main function of 4 (endodermis) is to
Asurround the inner tissues
Bproduce cork
Cproduce root hairs
Dproduce lateral roots
Correct Answer: A
The endodermis surrounds and protects the inner vascular tissues.
JAMB (UTME)
Biology
1990
Q8916.In a dicot leaf, guard cells differ from other epidermal cells because they
Ahave no definite shape
Black nuclei
Care smaller
Dcontain chloroplasts
Correct Answer: D
Guard cells are the only epidermal cells that contain chloroplasts.
JAMB (UTME)
Biology
1990
Q8917.Which of the following structures is NOT found in the female agama lizard?
APre-anal pads
BEardrum
CGular fold
DNuchal crest
Correct Answer: A
Pre-anal pads are found only in male lizards (used during mating).
JAMB (UTME)
Biology
1990
Q8918.Herbs differ from shrubs because they
Ado not produce fruits
Bare useful to herbalists
Cdo not become woody
Dare only annuals
Correct Answer: C
Herbs have soft, non-woody stems, unlike shrubs which are woody.
JAMB (UTME)
Biology
1990
Q8919.If an isolated living cell is left in distilled water for two hours, it is likely to
Alose some of its water to the surrounding water
Blose all its water to the surrounding water
Creproduce by binary fission
Dbecome more turgid
Correct Answer: D
In distilled water (hypotonic solution), water enters the cell by osmosis, making it turgid.
JAMB (UTME)
Biology
1990
Q8920.If an organic compound has its Hydrogen:Oxygen ratio as 2:1, it is likely to be
Aa protein
Ba carbohydrate
Ca fat
Dan amino acid
Correct Answer: B
Carbohydrates have the general formula $C_n(H_2O)_m$, giving an H:O ratio of 2:1.
JAMB (UTME)
Biology
1990
Q8921.Which of the following elements are necessary for the formation of chlorophyll in a plant?
AMagnesium and iron
BCalcium and potassium
CCalcium and sulphur
DPotassium and sulphur
Correct Answer: A
Magnesium is a component of chlorophyll, and iron is needed for its synthesis.
JAMB (UTME)
Biology
1990
Q8922.Which of the following statements is NOT true of mammalian erythrocytes?
AThey have haemoglobin
BThey appear yellow when looked at singly
CThey are disc-shaped
DThey have nuclei at maturity
Correct Answer: D
Mature mammalian red blood cells lack nuclei.
JAMB (UTME)
Biology
1990
Q8923.In woody plants, gases and water vapour are transported across the stems by the
Axylem fibres
Bmedullary fibres
Clenticels
Dphloem fibres
Correct Answer: C
Lenticels are pores in the bark that allow gaseous exchange.
JAMB (UTME)
Biology
1990
Q8924.Which of the following substances is NOT found in urine?
AWater
BSodium chloride
CNitrogenous compounds
DGlucose
Correct Answer: D
Glucose is normally completely reabsorbed in the kidney and is not found in urine.
JAMB (UTME)
Biology
1990
Q8925.The kidneys of all vertebrates act as osmoregulators. This means that they
Akeep the composition of the plasma constant
Bregulate osmotic processes
Ccontrol the volume of blood entering the kidneys
Ddecrease the osmotic pressure of blood
Correct Answer: A
Osmoregulation maintains constant plasma composition and water balance.
JAMB (UTME)
Biology
1990
Q8926.The movement of part of a plant in response to external stimulus of no particular direction is
Ataxism
Btropism
Cnastic movement
Dphototropism
Correct Answer: C
Nastic movements are non-directional responses to stimuli.
JAMB (UTME)
Biology
1990
Q8927.The part of the mammalian brain responsible for maintaining balance is the
Amedulla oblongata
Bolfactory lobe
Ccerebellum
Dcerebrum
Correct Answer: C
The cerebellum controls balance, posture, and coordination.
JAMB (UTME)
Biology
1990
Q8928.Which of the labelled parts in Fig 2 (vertical section of onion bulb) will develop into a new bulb?
A1
B4
C2
D3
Correct Answer: D
The axillary bud (labelled 3) develops into a new bulb.
JAMB (UTME)
Biology
1990
Q8929.In the onion bulb, food is stored in the
Astem
Blateral buds
Ccotyledons
Dleaf bases
Correct Answer: D
The fleshy leaf bases (scales) store food in an onion bulb.
JAMB (UTME)
Biology
1990
Q8930.Groundnut is not really a 'nut' in the biological sense because
Ait is harvested from inside the ground
Bits pericarp is not hard and tough
Cthe fruit is succulent
Dit is an achene
Correct Answer: B
A true nut has a hard, tough pericarp. Groundnut has a soft pericarp, so it is a legume.
JAMB (UTME)
Biology
1990
Q8931.What type of fruit is formed from a single flower having several free carpels?
AMultiple fruit
BSimple fruit
CAggregate fruit
DDehiscent fruit
Correct Answer: C
An aggregate fruit develops from several free carpels of a single flower.
JAMB (UTME)
Biology
1990
Q8932.A 28g soil sample was heated to a constant weight of 24g. When further heated to red hot and cooled, it weighed 18g. What is the percentage of humus in the soil?
A22.2
B55.6
C75.0
D25.9
Correct Answer: A
Humus = loss on ignition = 24 - 18 = 6g. Percentage = (6/28) × 100 = 21.4% ≈ 22.2%. (Note: The answer key was not in the source; calculated value is closest to A).
JAMB (UTME)
Biology
1990
Q8933.Which of the following diseases is NOT caused by a virus?
ARinderpest
BMaize rust
CNewcastle disease
DCassava mosaic disease
Correct Answer: B
Maize rust is caused by a fungus, not a virus.
JAMB (UTME)
Biology
1990
Q8934.A centipede differs from a millipede by its
Acolour
Bnumerous abdominal segments
Cpaired legs on each abdominal segment
Dpoison claws
Correct Answer: D
Centipedes have poison claws (forcipules), which millipedes lack.
JAMB (UTME)
Biology
1990
Q8935.An organism having one pair of identical genes is
Aa heterozygote
Ba hybrid
Can allelomorph
Da homozygote
Correct Answer: D
A homozygote has identical alleles for a particular gene.
JAMB (UTME)
Biology
1990
Q8936.Plants which can survive in places where the water supply is limited are
Abryophytes
Bmesophytes
Cxerophytes
Dhydrophytes
Correct Answer: C
Xerophytes are adapted to survive in dry environments.
JAMB (UTME)
Biology
1990
Q8937.Banana, plantain and pineapple can be grouped together because they
Aproduce small seeds
Bare multiple fruits
Cproduce suckers
Dhave runners
Correct Answer: C
Banana, plantain, and pineapple all reproduce vegetatively by suckers.
JAMB (UTME)
Biology
1990
Q8938.One disease NOT caused directly by bacteria is
Amalaria
Btuberculosis
Cpneumonia
Dtetanus
Correct Answer: A
Malaria is caused by a protozoan (Plasmodium), not a bacterium.
JAMB (UTME)
Biology
1990
Q8939.Mouth
A1, 2, 3, 4, 5
B1, 5, 2, 4, 3
C1, 3, 4, 5, 2
D5, 3, 4, 1, 2
Correct Answer: B
The correct sequence is: external gills → mouth → internal gills → hindlimbs → forelimbs.
JAMB (UTME)
Biology
1990
Q8940.The dental formula i 3/3: c 1/1: pm 4/4: m 2/3 = 42 represents that of a
Arabbit
Bfull grown man
Cyoung child
Ddog
Correct Answer: B
The dental formula given (i 2/2, c 1/1, pm 2/2, m 3/3 = 32) is actually for humans. The formula in the question (42 teeth) is more characteristic of a dog or pig. (Note: The source text is corrupted; the answer is uncertain).
JAMB (UTME)
Biology
1990
Q8941.Which of the following statements is NOT true of insectivorous plants?
AThey obtain part of their food by trapping and feeding on insects
BThey attract insects simply because of pollination
CThey can grow in soils poor in nitrogenous salts
DThey can supplement the nitrogen supply by feeding on insects
Correct Answer: B
Insectivorous plants attract insects for food, not for pollination.
JAMB (UTME)
Biology
1990
Q8942.Which of these worms is beneficial to man?
AHookworm
BTapeworm
CRoundworm
DEarthworm
Correct Answer: D
Earthworms improve soil fertility by aerating and mixing the soil.
JAMB (UTME)
Biology
1990
Q8943.Starting from the skull end, the vertebrae are arranged in the following order:
Aaxis, atlas, cervical, thoracic and lumbar
Batlas, cervical, axis, thoracic and lumbar
Catlas, axis, thoracic, cervical and lumbar
Datlas, axis, cervical, thoracic and lumbar
Correct Answer: D
The correct order from the skull is: atlas → axis → cervical → thoracic → lumbar.
JAMB (UTME)
Biology
1990
Q8944.Which of the following diseases could be exclusively associated with a river basin?
AMalaria
BSyphilis
COnchocerciasis
DCholera
Correct Answer: C
Onchocerciasis (river blindness) is associated with fast-flowing rivers where the blackfly vector breeds.
JAMB (UTME)
Biology
1990
Q8945.Conifers
A2, 1, 4, 3, 5
B5, 4, 3, 2, 1
C2, 4, 5, 1, 3
D4, 3, 2, 5, 1
Correct Answer: D
The evolutionary sequence is: Algae → Mosses → Ferns → Conifers → Flowering plants.
JAMB (UTME)
Biology
1990
Q8946.Which of the following will NOT allow osmosis to occur?
APig's bladder
BCellophane
CParchment paper
DTransparent polythene
Correct Answer: D
Transparent polythene is impermeable to water, so osmosis cannot occur.
JAMB (UTME)
Biology
1990
Q8947.Which of the following statements on the mammalian circulatory system is NOT true?
ABlood in the pulmonary artery is richer in oxygen content than blood in the pulmonary vein
BThe blood in the hepatic portal vein is the richest in food substances
CBlood flow is controlled by valves in the veins
DArteries are generally thicker and larger than veins
Correct Answer: A
The pulmonary artery carries deoxygenated blood, while the pulmonary vein carries oxygenated blood.
JAMB (UTME)
Biology
1990
Q8948.In a positive phototropic response of a coleoptile, the region of greatest curvature is brought about by the
Amovement of auxins away from the region of curvature
Beven distribution of auxins in all parts of the coleoptile
Cinhibition of growth by auxins in the region of smaller curvature
Dconcentration of auxins in the region of curvature
Correct Answer: D
Auxins accumulate on the shaded side, causing greater elongation and curvature towards light.
JAMB (UTME)
Biology
1990
Q8949.The tuber of cassava is NOT a stem tuber because it
Ais distended with food reserve
Bhas an aerial shoot portion
Chas other structures that could be called roots
Dlacks axillary buds
Correct Answer: D
Cassava tubers are root tubers because they lack axillary buds (which are present in stem tubers).
JAMB (UTME)
Biology
1990
Q8950.The function of the ossicles (malleus, incus and stapes) in the mammalian ear is the
Atransmission of vibrations
Bregulation of pressures
Csupport of the inner ear
Dmaintenance of balance during motion
Correct Answer: A
The ossicles transmit and amplify sound vibrations from the eardrum to the inner ear.