Q9454.In which of the following crosses will all the female offspring be colour blind?
AColour blind mother × colour blind father
BColour blind mother × normal father
CCarrier mother × colour blind father
DCarrier mother × normal father
Correct Answer: A
If both parents are colour blind, all daughters will be colour blind.
JAMB (UTME)
Biology
2000
Q9455.Which of the following relates to edaphic factors?
AThe structure of the earth's surface
BThe influence of living organisms on each other
CTemperature, rainfall and humidity
DThe influence of soils on plants and animals
Correct Answer: D
Edaphic factors relate to the soil.
JAMB (UTME)
Biology
2000
Q9456.Epiphytes growing on the branches of trees provide an example of the relationship known as
Aparasitism
Bcommensalism
Camensalism
Dholophytism
Correct Answer: B
Epiphytes benefit from trees without harming them (commensalism).
JAMB (UTME)
Biology
2000
Q9457.Poliomyelitis is an infectious disease caused by
Avirus
Bprotozoan
Cbacterium
Dfungus
Correct Answer: A
Poliomyelitis is caused by a virus.
JAMB (UTME)
Biology
2000
Q9458.One of the functions of UNICEF is to
Aprevent and control major diseases
Bprevent disease outbreak by administering vaccines
Cimprove the health and nutrition of children and nursing mothers
Dmonitor environment pollution
Correct Answer: C
UNICEF works to improve the health and nutrition of children and mothers.
JAMB (UTME)
Biology
2000
Q9459.Nitrifying bacteria are important because they
Arelease nitrogen to the atmosphere
Bconvert atmospheric nitrogen to ammonia
Ccombine ammonium with nitrogen
Doxidize ammonium salts to nitrates
Correct Answer: D
Nitrifying bacteria oxidize ammonium salts to nitrates.
JAMB (UTME)
Biology
2000
Q9460.The process by which lime is added to clay soils is known as
Asedimentation
Bflocculation
Cleaching
Dmanuring
Correct Answer: B
Flocculation is the process of adding lime to clay soils to improve structure.
Instruction
JAMB Biology 2001
JAMB (UTME)
Biology
2001
Q9461.An association between the root nodule of a leguminous plant and Rhizobium sp is known as
Acommensalism
Bmycorrhiza
Cparasitism
Dsymbiosis
Correct Answer: D
Rhizobium and leguminous plants have a mutualistic (symbiotic) relationship.
JAMB (UTME)
Biology
2001
Q9462.Amphibians are normally found
Aon dry land and in water
Bin water and moist land
Con moist land
Din water
Correct Answer: B
Amphibians are found in water and moist land environments.
JAMB (UTME)
Biology
2001
Q9463.Viviparity occurs mainly in the
Amammals
Breptiles
Caves
Damphibians
Correct Answer: A
Viviparity (live birth) is characteristic of most mammals.
JAMB (UTME)
Biology
2001
Q9464.The jointed structure in insects that bears organs which are sensitive to touch, smell and vibration is the
Amaxilla
Blabium
Cantenna
Dabdomen
Correct Answer: C
Antennae are sensory organs for touch, smell, and vibration.
JAMB (UTME)
Biology
2001
Q9465.Which of the following groups is the most advanced?
APteridophytes
BBryophytes
CThallophytes
DGymnosperms
Correct Answer: D
Gymnosperms are more advanced than pteridophytes, bryophytes, and thallophytes.
JAMB (UTME)
Biology
2001
Q9466.Most monocots are easily recognized by their
Ashort leaves with petioles
Blong and swordlike leaves
Clong and palm-like leaves
Dshort leaves with many venlets
Correct Answer: B
Monocots typically have long, narrow (swordlike) leaves with parallel venation.
JAMB (UTME)
Biology
2001
Q9467.Water fleas, wood lice and barnacles belong to the group
Aarachnida
Bcrustacea
Cinsecta
Dchilopoda
Correct Answer: B
Water fleas, wood lice, and barnacles are crustaceans.
JAMB (UTME)
Biology
2001
Q9468.The mode of feeding in Amoeba and Hydra is
Aheterotrophic
Bholophytic
Cautotrophic
Dsymbiotic
Correct Answer: A
Amoeba and Hydra are heterotrophic (holozoic) feeders.
JAMB (UTME)
Biology
2001
Q9469.Which of the following organisms does not exist as a single free-living cell?
AParamecium
BVolvox
CAmoeba
DChlamydomonas
Correct Answer: B
Volvox exists as a colony of cells, not as a single free-living cell.
JAMB (UTME)
Biology
2001
Q9470.The structures labelled II and III respectively are
Afemale organs and rhizoid
Bmale organs and rhizoid
Csporophyte and sori
Dannulus and stalk of sporangium
Correct Answer: B
The archegonia (II) are female organs and rhizoids (III) anchor the prothallus. Wait, the correct answer based on the diagram is: II is the male organ (antheridia) and III is the rhizoid.
JAMB (UTME)
Biology
2001
Q9471.In ferns, the structure above is equivalent to the
Azygote of a moss
Bgametophyte generation of a moss
Csporophyte generation of a moss
Dsporophyte of a moss
Correct Answer: B
The prothallus (gametophyte) of a fern is equivalent to the gametophyte generation of a moss.
JAMB (UTME)
Biology
2001
Q9472.The centre for learning and memory in the human brain is the
Amedulla oblongata
Bcerebellum
Ccerebrum
Dolfactory lobe
Correct Answer: C
The cerebrum is responsible for learning and memory.
JAMB (UTME)
Biology
2001
Q9473.Urea formation occurs in the
Aheart
Bliver
Clung
Dkidney
Correct Answer: B
Urea is formed in the liver during deamination.
JAMB (UTME)
Biology
2001
Q9474.The structure that holds the yolk in position is labelled
AII
BI
CIV
DIII
Correct Answer: A
The chalaza (II) holds the yolk in position in the egg.
JAMB (UTME)
Biology
2001
Q9475.The part labelled IV is the
Aalbumen
Bgerminal disc
Cshell
Dair space
Correct Answer: B
The germinal disc (IV) is the site of fertilization and embryo development.
JAMB (UTME)
Biology
2001
Q9476.The gas produced during tissue respiration can be identified by using
Acalcium hydroxide
Bcopper sulphate
Clime water
Dsodium hydroxide
Correct Answer: C
Lime water turns milky in the presence of carbon dioxide.
JAMB (UTME)
Biology
2001
Q9477.The enzyme invertase will hydrolyze sucrose to give
Amaltose and glucose
Bglycerol and fatty acid
Cglucose and fructose
Dmannose and galactose
Correct Answer: C
Invertase hydrolyzes sucrose to glucose and fructose.
JAMB (UTME)
Biology
2001
Q9478.When yeast respires anaerobically, it converts simple sugar to carbon (IV) oxide and
Aoxygen
Bacid
Calcohol
Dwater
Correct Answer: C
Anaerobic respiration in yeast produces ethanol (alcohol) and CO₂.
JAMB (UTME)
Biology
2001
Q9479.The transportation of oxygen and carbon (IV) oxide in mammals is carried out by
Aleucocytes
Bthrombocytes
Cphagocytes
Derythrocytes
Correct Answer: D
Erythrocytes (red blood cells) transport oxygen and carbon dioxide.
JAMB (UTME)
Biology
2001
Q9480.The veins of the leaf are formed by the
Avascular bundles
Bcambium cells
Cpalisade tissue
Dspongy mesophyll
Correct Answer: A
Leaf veins are formed by vascular bundles (xylem and phloem).
JAMB (UTME)
Biology
2001
Q9481.The parts which function together to bring about hearing are labelled
AIV, V and VI
BII, IV and VI
CI, II, III and IV
DI, II and IV
Correct Answer: D
The ear drum, ossicles, and cochlea (I, II, IV) function together for hearing.
JAMB (UTME)
Biology
2001
Q9482.The part labelled II is the
Afenestra ovalis
Bmiddle ear canal
Cinternal auditory meatus
Dear ossicles
Correct Answer: D
The ear ossicles (malleus, incus, stapes) are labelled II.
JAMB (UTME)
Biology
2001
Q9483.When specimen X is mixed with few drops of iodine solution, the appearance of a blue-black colour confirms that X is
AGalactose
BStarch
CSucrose
DGlucose
Correct Answer: B
Iodine solution gives a blue-black colour with starch.
JAMB (UTME)
Biology
2001
Q9484.The structure above represents a
Acaudal vertebra
Blumbar vertebra
Cthoracic vertebra
Dcervical vertebra
Correct Answer: C
The thoracic vertebra has a long neural spine and facets for ribs.
JAMB (UTME)
Biology
2001
Q9485.Blood vessels usually pass through the structure labelled
AIII
BII
CV
DIV
Correct Answer: C
Blood vessels pass through the vertebrarterial canal (V).
JAMB (UTME)
Biology
2001
Q9486.Salts and water are absorbed in the roots and transported to the leaves by
Adiffusion
Bosmosis
Ctranspiration
Dtranslocation
Correct Answer: C
Transpiration pull moves water and salts from roots to leaves.
JAMB (UTME)
Biology
2001
Q9487.The number of plant species obtained from a population study of a garden is as follows: Guinea grass (15), Ipomoea spp (5), Sida spp (7) and Imperata spp (23). What is the percentage of occurrence of Imperata spp?
A35%
B16%
C46%
D23%
Correct Answer: C
Total = 15 + 5 + 7 + 23 = 50. Percentage of Imperata = (23/50) × 100 = 46%.
JAMB (UTME)
Biology
2001
Q9488.Carbon (IV) oxide content of the atmosphere is least affected by
Acutting down and clearing of forest
Bforest fires
Cburning of fossil fuels
Dplant and animal respiration
Correct Answer: D
Plant and animal respiration is a natural process with minimal impact compared to human activities.
JAMB (UTME)
Biology
2001
Q9489.The factor that least affects food shortages in sub-Saharan Africa is
Aflooding
Bpests
Cmixed-cropping
Ddrought
Correct Answer: C
Mixed-cropping is a farming practice that reduces food shortage, not causes it.
JAMB (UTME)
Biology
2001
Q9490.The epiphytic habitat can best be described as
Aarboreal
Bestuarine
Caquatic
Dterrestrial
Correct Answer: A
Epiphytes live on trees (arboreal habitat).
JAMB (UTME)
Biology
2001
Q9491.The highest percentage of energy in an ecosystem occurs at the level of the
Asecondary consumers
Bdecomposers
Cproducers
Dprimary consumers
Correct Answer: C
Producers have the highest energy content in an ecosystem.
JAMB (UTME)
Biology
2001
Q9492.The greatest influence on a stable ecosystem in nature is exerted by
Aman
Bpollution
Canimals
Drainfall
Correct Answer: A
Human activities have the greatest impact on ecosystems.
JAMB (UTME)
Biology
2001
Q9493.A freshwater pond may contain
Atadpole, water boatman, leeches and crab
Bwater beetle, shrimps, water snail and water bug
Cwater lily, fish, water scorpion and dragonfly larva
Dpond skater, water lily, shark and mosquito larva
Correct Answer: C
A freshwater pond contains water lily, fish, water scorpion, and dragonfly larva.
JAMB (UTME)
Biology
2001
Q9494.The hygrometer is used for measuring
Arelative humidity
Bspecific gravity
Crainfall
Dsalinity
Correct Answer: A
A hygrometer measures relative humidity.
JAMB (UTME)
Biology
2001
Q9495.The distribution of plants in a rain forest is governed mainly by
Avegetation
Bsoil types
Camount of sunlight
Drainfall pattern
Correct Answer: C
Light availability is the main factor determining plant distribution in rain forests.
JAMB (UTME)
Biology
2001
Q9496.Both recessive and dominant characters are found
Aon different chromosomes in the cell
Bat the same locus of a homologous chromosome
Con the mother's sex cell
Don the mother's X chromosome
Correct Answer: B
Alleles (dominant and recessive) are found at the same locus on homologous chromosomes.
JAMB (UTME)
Biology
2001
Q9497.The probability of a baby being a boy or a girl depends on the condition of the
Afather's sex cell
Bfather's somatic chromosome
Cmother's sex cell
Dmother's X chromosome
Correct Answer: A
The father's sperm determines the sex of the baby (X or Y chromosome).
JAMB (UTME)
Biology
2001
Q9498.Which of the following statements is true of blood groups and blood transfusion?
AGroup O is the universal recipient
BGroup A can donate to group O
CGroup AB is the universal recipient
DGroup B can donate to group A
Correct Answer: C
Group AB is the universal recipient because it has no antibodies.
JAMB (UTME)
Biology
2001
Q9499.Which of the following is likely to encourage inbreeding in plants?
ADioecious
BProtandrous
CMonoecious
DHermaphrodite
Correct Answer: D
Hermaphroditic plants have both male and female organs, encouraging self-pollination.
JAMB (UTME)
Biology
2001
Q9500.A tall plant crossed with a dwarf one produces offspring of which half are tall and half are dwarf. What are the genotypes of the parents?