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
- A. A
- B. B
- C. AB
- D. OO
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?
- A. E
- B. F
- C. G
- D. H
In typical predator food chain involving secondary and tertiary consumers, the organism become progressively
- A. smaller and more numerous along the food chain
- B. equal in number and size along the food chain
- C. larger and fewer along the food chain
- D. parasitized along the food chain as consumers get bigger
A population is defined as a collection of similar organism that
- A. behave in the same way
- B. interbreed freely
- C. are found in the same habitat
- D. eat the same food
Which of the following is true of climax community?
- A. it persists until the enviroment or climate changes
- B. it changes drastically from one year to the next
- C. it is first stage in succession
- D. It is made up of the tallest trees and the smallest
Neurons that receive stimuli from the body or internal organs are called
- A. sensory neurons
- B. efferent neurones
- C. motor neurones
- D. relay neurones
