Question 1 of 20 156 total questions
Reflex action is controlled by
A cerebellum
B cerebrum
C medulla oblongata
D olfactory lobe
E pineal body
The end product of glycolysis is
A acetic acid
B citric acid
C ketoglutaric acid
D oxaloacetic acid
E pyruvic acid
Mealy bugs are pests of
A cassava
B cotton
C maize
D rice
E yarn
Blood groups and tongue rolling are examples of
A continuous variation
B discontinuous variation
C variation due to environment
D adaptive variation
E sex-linked variation
Food wastage is caused by the following EXCEPT
A attack of moulds on farm crops
B lack of access roads
C lack of transportation
D poor harvesting methods
E proper storage
Stunted growth and reduced yield in cassava plant is as a result of a disease called
A blight
B leaf curl
C leaf spot
D mosaic
E smut
The theory of evolution by natural selection was first put forward by
A Aristotle
B Darwin
C Linnaeus
D Boyle
Which of the following is not included in the theory of natural selection?
A struggle for existence
B offspring show variation
C inheritance of adaptive structures
D disappearance of functionless organs
Which of the following organisms exhibit division of labour?
A houseflies
B butterflies
C cockroaches
D termites
Which of the following statements is correct about the chromosomes in the gametes? At the end of the second
A each gamete contains only paternal hereditary information
B chromosomes contain a random mixture of paternal and maternal chromosomes.
C chromosomes in the four gamete cells are diploid in number
D chromosomes contain only maternal hereditary information
In the F1 generation of Mendel’s experiment obtained by crossing pea plants of long stems with those of short stems,
A some were short while others were long
B all were long
C half of them were long while half were short
D three-quarters were long while one quarter were short,
Heterozygous tall plants were crossed with pure-breeding dwarf plants of the same species. What were the approximate percentages of the offspring?
A 100% tall 0% dwarf
B 75% tall 25% dwarf
C 50% tall 50% dwarf
D 25% tall 75% dwarf
Which of the following traits in humans can be affected by environmental factors?
A skin colour
B eye colour
C baldness
D tongue-rolling
What will be the genotypic ratio when two heterozygous red pea plants are crossed?
A 1 : 0
B 1 : 2 : 1
C 2 : 1
D 3 : 1
In man, sex is determined by the inheritance of
A a pair of homologous chromosomes
B an extra chromosome in the cells of a female
C a dominant gene for maleness present in man
D two similar X chromosomes in the female and X and Y chromosomes in the male.
The ability of some individuals to taste phenylthiocarbamide (PTC) is a
A morphological adaptation
B morphological variation
C physiological adaptation
D physiological variation
Which of these physiological variations is sex-linked?
A albinism
B blood groups
C sickle-cell anaemia
D haemophilic condition
Tropical rain forests can be conserved by the following practices except?
A agroforestry
B deforestation
C shifting cultivation
D crop rotation
Which of the following practices does not contribute to intensive depletion of forest resources in West Africa?
A Use of powerful tools for felling trees
B regrowing of forest trees
C clearance of forests for cash crops
D use of fire or hunting in forests
The following are natural resources except
A rubber
B soil
C water
D cellophane
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