Question 1 of 20 114 total questions
Which of the following orders correctly represents the trend in eutrophication?
A Lack of oxygen → Death of aquatic organisms → Massive algal growth
B Excess nitrates and phosphates → Massive algal growth → Lack of oxygen → Death of aquatic organisms
C Heavy mineralization → Lack of oxygen → Massive algal growth
D Excess nitrates and phosphates → Lack of oxygen → Massive algal growth → Death of aquatic organisms
The physical and chemical factors which affect the life of organisms in an environment are described as
A biotic
B edaphic
C abiotic
D physiographic
The ventricles of the mammalian heart have thicker
A ventricles are larger
B ventricles receive more blood
C ventricles pump blood to longer distances
D auricles have smaller capacity
Which of the following vertebrae provide articulating surfaces for the ribs?
A Thoracic
B Lumbar
C Cervical
D Sacral
Which of the following vertebrae provide articulating surfaces for the ribs?
A Thoracic
B Lumbar
C Cervical
D Sacral
The long necks and legs of the present day giraffes were some of the basis of
A Darwins’ theory of evolution
B Mendel’s theory of inheritance
C Lamarck’s theory of evolution
D DeVries theory of evolution
Honey-Bee workers carry out the following functions except
A laying eggs
B building nests
C cleaning the nest
D gathering food
Courtship behaviour in animals may include all of the following except
A howling of a dog
B dancing of the worker bee
C croaking of a toad
D basking in the sun by a lizard
a pure breeding white cat (homozygous dominant) mates with a pure breeding black cat (recessive), what would be the fur colour of F1 generation
A Homozygous white
B Homozygous black
C Heterozygous white
D Heterozygous black
The haploid number of chromosomes in humans is
The contrasting pair of genes affecting a trait and located at the same position on homologous chromosomes is
A chromatids
B mutants
C alleles
D chromatin
If a heterozygous red flowered plant, (Rr) was self-fertilized, the offspring would be expected to be
A all red flowered plants
B all white flowered plants
C red flowered, white flowered plants
D white flowered red flowered plants
The blood group in humans referred to as a universal recipient is
Which of the following trait in humans is not a morphological variation?
A Height
B Shape of head
C Colour of skin
D Ability to roll the tongue
Variation is a factor which
A differentiates between individuals of the same species
B qualifies an organism to live with others
C enables organisms to adapt to the environment
D states the external features of an organism
The following practices can contribute towards the conservation of natural resources except
A afforestation
B deforestation
C contour ploughing
D establishment of Game Reserves
Which of the following orders correctly represents the trend in eutrophication?
A Lack of oxygen → Death of aquatic organisms → Massive algal growth
B Excess nitrates and phosphates → Massive algal growth → Lack of oxygen → Death of aquatic organisms
C Heavy mineralization → Lack of oxygen → Massive algal growth
D Excess nitrates and phosphates → Lack of oxygen → Massive algal growth → Death of aquatic organisms
An effective management of natural resources to ensure their continued yield from generation to generation may involve all the following except
A protection of wildlife
B prevention of habitat destruction
C biological control of pests
D disposal of raw sewage into the sea
Air pollution can be reduced by the following methods except?
A building tall factory chimneys
B passing waste gases through filters and absorbers
C using lead-free petrol in car
D recycling tins, cans and bottles
Which of these diseases cannot be spread by an insect?
A Cholera
B Malaria
C Trypanosomiasis
D Measles
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