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Over-crowding in seedlings of different species is less serious than over-crowding involving one species
because different species may
Ahave different nutritional needs
Black the same nutrient
Cbe active at the same time
Dhave similar tolerance
Eneed equal spacing
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Question 2163
waec1989
The term afforestation is used in describing
Aharvesting of natural forest resources
Bplanting trees of value to man
Cfallowing of forestland
Dfelling of trees in the forest
Erecycling of waste forest products.
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Question 2164
waec1989
The inability of some individuals to perceive the taste of some substances is an example of
Aindividual adaptation
Bphysiological variation
Cmorphological variation
Dmorphological adaptation
Ephysical variation
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Question 2165
waec1989
The spaces between neutrones through which impulses cross by means of chemical reaction are called
Aaxons
Bganglia
Csynapses
Ddendrites
Epia mater
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Question 2166
waec1989
Which of the following fixes atmospheric nitrogen?
ARhizobium
BNitrosomonas
CNitrobacter
DPutrefying bacteria
EDenitrifying bacteria
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Question 2167
waec1989
Group instinct or social behaviour is not displayed in
Asoldier ants
Bbees
Cchickens
Dweaver birds
Etermites
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Question 2168
waec1989
One of the methods of preventing measles is by
Asleeping under mosquito net
Battacking the vectors
Cattacking the secondary host
Dvaccinating young children
Eproviding clean water supply
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Question 2169
waec1989
Which of the following effects would desertification have on the
ecological balance represented in the diagram above? The calorific
value' of the energy
A. 10 x 104k cal obtained from the sun would decrease
B10 x 104k cal obtained from the sun would increase
C6 x 104k cal obtained at level I would increase
D1 x 104k cal obtained at level V would increase
E3.5x 104k cal obtained at level II would increase
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Question 2170
waec1989
What phenomenon in ecosystem does the diagram illustrate?
APyramid of numbers
BFood web among organisms
CPyramid of energy
DPyramid of biomass
EEvolutionary trend in organisms
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Question 2171
waec1989
The similarity between the bone structure of the arm of a human and the fore-limb of a
rabbit indicates
Aadaptive radiation
Bcontinuous variation
Ca common origin
Dconvergent evolution
Eadaptation to the same environment
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Question 2172
waec1989
The evidence for evolution can be obtained from the following except
Afossil
Banatomy
Chistory
Dembryology
Etaxonomy.
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Question 2173
waec1989
What is the name given to the structure labelled A at this stage of cell division
AChromatin
BCentrtomere
CChromatid
DGene
EDaughter-chromosome
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Question 2174
waec1989
What stage is illustrated by the diagram?
Alnterphase
BProphase
CMetaphase
DAnaphase
ETelophase
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Question 2175
waec1989
All hereditary characters in a cell are passed on from parent-cell to daughter-cell through the process of
Amitosis
Bmeiosis
Cfertilization
Dimplantation
Egestation
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Question 2176
waec1989
Which of the following represents the phenotypic ratio, when a plant Rr is crossed with another plant Rr,
assuming that the gene R for round seed is dominant and wrinkled r is recessive?
A1:2:1
B2:2:1
C3:2
D3:1
E4:1
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Question 2177
waec1989
At which of the following stages of cell division can the cell be said to be resting
AAnaphase
BTelophase
CProphase
Dinterphase
EMetaphase
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Question 2178
waec1989
Breathing roots are characteristic structures of plants growing in
Amangrove swamp
Bdesert
Cshrub biome
Dsavannah
Etropical rain forest
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Question 2179
waec1989
The term used in describing the effective management of national resources by man is
Apreservation
Butilization
Ceconomics
Ddevelopment
Econservation
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Question 2180
waec1989
Which of the following is not an effect of overcrowding on a population?
