Question 1 of 20 2,572 total questions
Which of the following organs or cells components are common to both the sporophytes and the gametophytes of a fern?
A Rhizoids
B Roots
C Chloroplast
D Leaves
In which of these features do bryophytes differ from pteridophytes?
A Absence of flower
B Alternation of generation
C Dependency on water for reproduction
D Presence of vascular system
Production of naked seeds is a distinctive feature of the group of plant called
A grasses
B conifers
C legumes
D palms
On what structure are the units of inheritance situated?
A Golgi bodies
B Ribosomes
C Chromosomes
D Endoplasmic reticulum
Fossil records found in sedimentary rocks offer some explanation for the theory of evolution because
A the deposit have remains of organisms characteristic of when they were formed
B different strata have remains of organisms of the same kind
C only organisms with strong parts are fossilized
D most animal and plant fossils bear little resemblance to present day living specimens
The theory of natural selection was developed by
A Lamarck and Darwin
B Darwin and Wallace
C Wallace and Mendel
D Mendel and Larmack
Which of the following factors is LEAST likely to affect the animals living in a fresh water habitat?
A Turbidity
B Temperature
C pH
D Salinity
An example of plant adaptation to a xerophytic environment is represented by the development of
A fleshy tissue and reduced leaves
B broad canopy and extensive surface root system
C thick barks and broad leaves
D rough leaves and shallow root system
The hereditary materials of the cell is
A the R N A
B protein
C the D N A
D carbohydrate
Woman do not suffer from colour blindness because
A the trait is sex-linked
B only men are colour blind
C the genes are recessive and sex-linked
D the genes occur on both the X and Y chromosomes
Pawpaw seeds collected from a tree with many desirable agronomic qualities did not give rise to plants of desirable character as the parent because
A seeds are not reliable for propagating plants
B uncontrolled out-crossing can introduced unwanted variability
C vegetative propagation is best form of reproduction of all crop
D seeds were not physiologically mature at the harvest
A mammal with red fur and long ears was crossed with another having white fur and short ears. If the offspring had a red fur and short ears, the
A character are linked
B character are not linked
C parents are related
D parents are not related
If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are
A RR, 2Rr, rr
B 2RR, 2rr, 2rr
C 2RR, 2Rr
D 4Rr
A child with blood group genotype different from those of both parents and with a mother of genotype OO, can only have a father of genotype
Which of the following is true of the children of a heamophilic man who marries a woman that is not haemophilic and does not carry the trait?
A All their sons will be haemophlic
B all their daughters will be haemophilic
C All their daughters will be carriers
D all their sons will be carriers
Malaria symptoms are caused by
A toxins released into the blood as a result of the destruction of red blood cell
B the multiplication of the malaria sporozites in the liver
C the invasion of the red blood cells by the trophozoites
D the development of merozoites into gametocytes
Soil with the finest particles is called
A silt
B clay
C sand
D gravel
Mangrove swamp can be found
A on a seashore with flat terrains
B where a river meets the sea
C on a mud flat near the sea
D where two rivers meet
Which organism in the pyramid functions as a tertiary consumer?
A Algea
B Shark
C Tadpole
D Tilapia
Which level of the pyramid has the least total stored energy?
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