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If a cross is made between a pure-breeding red flowered plant and a pure-breeding white flowered plant
where R is dominant for red flower and r is recessive for white, the most likely result of F generation will be
A75% red flowers and 25% white flowers
Ball red flowers
C75% white flowers and 25% red flowers
D50% red flowers and 50% white flowers
Eall white flowers
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Question 2222
waec1988
The haploid number of chromosomes in man is
A48
B46
C42
D24
E23
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Question 2223
waec1988
Which of the following best describes the homologous chromosomes? They are
Aa product of the division of a chromosome
Btwo identical chromosomes from each parent
Cchromosomes arranged on spindle fibres during cell division
Ddaughter chromatides formed during meiotic division
Echromosomes during telophase of mitotic division
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Question 2224
waec1988
Which of the following is not a constituent of DNA?
APurine
BPhosphate
CCystocine
DDeoxyribose
EUracil.
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Question 2225
waec1988
Assuming that ‘A’ is gene for normal skin and it is dominant, while ‘a’ is gene for albinism and it is recessive,
what is the likely genotype of a couple which had 50% normal and 50% albinos?
AAA,Aa
BAA,aa
CAa, Aa
DAa, aa
EAA,AA
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Question 2226
waec1988
Which of the following major ideas were proved by Gregor Mendel?
AThere is a tendency among organisms `to increase rapidly in number if conditions are favourable
BThere is a struggle for existence among a very large number of offspring
CNature selects organisms which will survive to produce their kind
DAll species exhibit structural and functional variations
ECharacteristics of an organism are controlled by genes occurring in pairs
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Question 2227
waec1988
During blood transfusion, agglutination may occur as a result of the reaction between
Asimilar antigens and antibodies
Bcontrasting antigens and antibodies
Ctwo different antigens
Dtwo different antibodies
Ewhite blood cells from the two individuals.
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Question 2228
waec1988
Which of the following .is not part of the objectives of conservation of natural resources?
ATo eliminate wild animals in order to enable other plants and animals survive
BTo use our resources on sustained yield basis
CTo guard against indiscriminate killing of plants and animals
DTo guard against the extinction and exhaustion o natural resources
ETo protect the environment
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Question 2229
waec1988
Which of the following steps would not be taken to protect or conserve fishing grounds from over-exploitation?
A. Use of nets with all sizes of mesh
BUse of nets with a particular mesh size
CBan on harvesting of some species
DRegulating the size of ships allowed into fishing grounds
ELimiting the period of fishing in the waters
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Question 2230
waec1988
A constituent of the exhaust gases of motor vehicles which causes serious air pollution is
Awater vapour
Bcarbondioxide
Ccarbon monoxide
Doxygen
Eozone
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Question 2231
waec1988
The vector of the malarial parasite is the
Amale Anopheles
Bfemale Culex
Cmale Culex
Dfemale Anopheles
Efemale Aedes
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Question 2232
waec1988
Which of the following are not causative organisms of plant diseases?
AFungi
BViruses
CBacteria
DNematodes
ECercariae
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Question 2233
waec1988
The causative organism of sleeping sickness is the?
ATrypanosome
BPlasmodium
CVibrio bacterium
Dpenicillin
Etsetse fly
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Question 2234
waec1988
Which of the following statements is not true of a climax vegetation? It
Ais an ecological phenomenon
Bis a stable community
Celiminates competition
Dresults from succession
Einvolves the colonization of a habitat
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Question 2235
waec1988
Terrestrial organisms which are capable of maintaining their body temperature constant within fairly close
limits are referred to as
Athermoclines
Bhomotherms
Cpoikilotherms
Deurytherms
Estenotherms
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Question 2236
waec1988
Which of the following factors is not associated with aquatic habitat?
ATemperature
BLight intensity
CHumidity
DTurbidity
EWave action
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Question 2237
waec1988
Which of the following is not a characteristic feature of tropical rain-forest habitat?
ATrees with longer boles than those in Savannah
BFewer canopy strata than the savannah
CMany more trees and climbers than savannah
DPlenty of leaf litter on the ground
EMore diverse communities than the savannah
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Question 2238
waec1988
Which of the following does not contribute to the biomass in an ecosystem?
AProducers
BFood chains
CConsumers
DMicro-organisms
ESaprophytes
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Question 2239
waec1988
Which of the following is not classified as a terrestrial habitat?
AForest
BGuinea Savannah
CAfro Alpine
DLittoral zone
EDesert
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Question 2240
waec1988
Autotropic nutrition may be defined in terms of food obtained
Afrom other organisms in exchange for some products.
Bby the breakdown of complex substances
Cby an organism utilizing its own store of energy
Dby synthesizing simple substances using energy from an external source
Ein a synthesized form from other living organism.
