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The organ which is sensitive to light in Euglena is the
Agullet
Bchloroplast
Ceye spot
Dcontractile vacuole
Eflagellum
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Question 932
waec1991
Which of the following statements best explains the meaning of homologous chromosomes?
AProduct of division of chromosomes
Btwo identical chromosomes from each parent
Cchromosome arranged on spindle fibre during cell division
Dchromosome arranged on the equatorial plate of the cell
EDaughter chromatide in the first melotic division
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Question 933
waec1991
In an individual who is heterozygous for a particular character, the hereditary factor that is always expressed is described as
Aallele
Bsickle-cell gene
Cdominant gene
Dchromosome
Esex-linked character
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Question 934
waec1991
The wing of a bat and that of a bird, the flippers of a whale and the fins of s fish are example of?
Aadaptive radiation
Bvestigial structures
Ccontinuous variation
Dconvergent evolution
Edivergent evolution
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Question 935
waec1991
who formulated the theory of natural selection in evolution?
ALouis pasteur
BRobert Hooke
CJean Lamarck
DMathias Schlieden
ECharles Darwin
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Question 936
waec1991
The phenomenon whereby some organisms with certain features get established in an environment is known as
Apartial selection
Bartificial selection
Cnatural selection
Dmutation
Ecolonization
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Question 937
waec1991
which of the following statements best explains the term aestivation?
Aa device for survival during a period of extreme food and water shortage
BA method of survival adopted by plants during dry season
CMovement of animals over long distance
DA method of survival adopted by animals under favourable condition
EA device for rapid multiplication during abundance of food
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Question 938
waec1991
Which of the following structures is a protective adaptive feature of the Agama lizard to terrestrial habitat?
AClaws
BGular fold
CScaly skin
DNuchal crest
Etail
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Question 939
waec1991
The adaptation for water conservation in organisms include the following except
Ascales in fishes
Bscales on leaves
Cthick leaves
Dspine in plants
Esucculent stem
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Question 940
waec1991
Which of the following limiting resources is competed for by organism in the desert?
ALight
BTemperature
COxygen
Dwater
ECarbondioxide
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Question 941
waec1991
Which of the following is not a way of conserving natural resources?
Acontrolling farming practice
BEstablishing forest reserve
CEstablishing of parks and gardens
DEncouraging poaching in game reserve
Eprotecting endangered species
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Question 942
waec1991
Agglutination occurs in blood transfusion when the
Adonor and the recipient belong to the same blood group
Bsame antibodies from donor and recipient fuse together
Cdonor and the recipient belong to different race
Drecipient is not a universal recipient
Eantigens and anitbody in the donor and the recipient react
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Question 943
waec1991
The practice of warming soup regularly as it concerns food preservation is essentially to
Aretain the taste
Bhelp to break down cellulose
Cremove excess water
Dkill the bacteria in it
Eraise the temperature
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Question 944
waec1991
I.Plasmodium II. Vibro Choleroe III. Gonococcus sp IV. Poliomyelitis virus V. Syphilis bacteria
which of the following organism are transmitted by houseflies?
AI and II only
BII and V only
CIII and IV only
DII and IV only
EIII and V only
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Question 945
waec1991
Predators are beneficial in pest control because they
Aare natural enemies of small mammals
Bdevour farm animals
Cfeed on pests of crops
Dprey on game animal
Ecompete for food with the pests
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Question 946
waec1991
Succession is best described as
Aa process whereby organisms systematically colonize a barren habitat until stable community is formed
Ba process whereby plant occupy a barren habitat until a suitable habitat is formed
Ca process whereby animals occupy a barren habitat until a suitable habitat is formed
Dthe subsequent taking over of the land through emigration or dispersal of seeds
Ethe replacement of weaker plants and animals by stronger ones
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Question 947
waec1991
Which of the following may not contribute to environmental pollution?
ASolar energy radiation
BIndustrial waste
CWaste disposal
DSmoke
ENuclear power plant
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Question 948
waec1991
Species do not change in order to survive. The environment determines which organism survives to reproduce. These statements
Aexplains theory of acquired characters
Bsupports Jean Lamarck's theory of use and disuse
Csupport the idea of survival of the fittest
Dare refuted by fossil record
Eimply that organisms modify their environment in order to survive
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Question 949
waec1991
The role of dead organic matter in the soil is to
Amake the soil black
Bincrease the mineral salt content
Cprovide food for all living organisms
Dincrease the acidity of soil
Emake the soil more porous
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Question 950
waec1991
Which of the following is the unit of transmission of hereditary traits in living organisms
