(a) (i) List five excretory organs found in living organisms.
(ii) Give one example of an organism in which each type is found.
(b) (i) state two ways in which the excretory organs of earthworm is similar to that of mammals.
(ii) Give three differences between them.
(c) Describe the mechanisms of opening and closing of the stomata.
(a) (i) List three components of an ecosystem (ii) Describe briefly the interaction among the components named in (a) (i).
(b) List three major steps that are usually taken in studying plants and animals in community.
(c) State the importance of each of the following in a population and explain how each affects the growth of a population:
(i) competition; (ii) pathogens; (iii)water.
(a) Make a labelled diagram to show the internal structure of the mammalian ear.
(b) Describe the mechanism of hearing in mammals.
(c) State two ways of caring for the ear.
(a)(i) Explain briefly the cell theory.
(ii) Name two scientists who contributed to the development of the cell theory.
(b) Make a large labelled diagram of a typical plant cell.
(c) List three ways in which a typical plant cell differs from a typical animal cell.
(d) State one difference each between Hydra and the mammals with respect to:
(i) level of organisation; (ii) symmetry; (iii) number of body layers.
Which of the following statements best explains the meaning of homologous chromosomes?
- A. Product of division of chromosomes
- B. two identical chromosomes from each parent
- C. chromosome arranged on spindle fibre during cell division
- D. chromosome arranged on the equatorial plate of the cell
- E. Daughter chromatide in the first melotic division
In an individual who is heterozygous for a particular character, the hereditary factor that is always expressed is described as
- A. allele
- B. sickle-cell gene
- C. dominant gene
- D. chromosome
- E. sex-linked character
The wing of a bat and that of a bird, the flippers of a whale and the fins of s fish are example of?
- A. adaptive radiation
- B. vestigial structures
- C. continuous variation
- D. convergent evolution
- E. divergent evolution
who formulated the theory of natural selection in evolution?
- A. Louis pasteur
- B. Robert Hooke
- C. Jean Lamarck
- D. Mathias Schlieden
- E. Charles Darwin
The phenomenon whereby some organisms with certain features get established in an environment is known as
- A. partial selection
- B. artificial selection
- C. natural selection
- D. mutation
- E. colonization
which of the following statements best explains the term aestivation?
- A. a device for survival during a period of extreme food and water shortage
- B. A method of survival adopted by plants during dry season
- C. Movement of animals over long distance
- D. A method of survival adopted by animals under favourable condition
- E. A device for rapid multiplication during abundance of food
Which of the following structures is a protective adaptive feature of the Agama lizard to terrestrial habitat?
- A. Claws
- B. Gular fold
- C. Scaly skin
- D. Nuchal crest
- E. tail
The adaptation for water conservation in organisms include the following except
- A. scales in fishes
- B. scales on leaves
- C. thick leaves
- D. spine in plants
- E. succulent stem
Which of the following limiting resources is competed for by organism in the desert?
- A. Light
- B. Temperature
- C. Oxygen
- D. water
- E. Carbondioxide
Which of the following is not a way of conserving natural resources?
- A. controlling farming practice
- B. Establishing forest reserve
- C. Establishing of parks and gardens
- D. Encouraging poaching in game reserve
- E. protecting endangered species
Agglutination occurs in blood transfusion when the
- A. donor and the recipient belong to the same blood group
- B. same antibodies from donor and recipient fuse together
- C. donor and the recipient belong to different race
- D. recipient is not a universal recipient
- E. antigens and anitbody in the donor and the recipient react
The practice of warming soup regularly as it concerns food preservation is essentially to
- A. retain the taste
- B. help to break down cellulose
- C. remove excess water
- D. kill the bacteria in it
- E. raise the temperature
I.Plasmodium II. Vibro Choleroe III. Gonococcus sp IV. Poliomyelitis virus V. Syphilis bacteria
which of the following organism are transmitted by houseflies?
- A. I and II only
- B. II and V only
- C. III and IV only
- D. II and IV only
- E. III and V only
Predators are beneficial in pest control because they
- A. are natural enemies of small mammals
- B. devour farm animals
- C. feed on pests of crops
- D. prey on game animal
- E. compete for food with the pests
Succession is best described as
- A. a process whereby organisms systematically colonize a barren habitat until stable community is formed
- B. a process whereby plant occupy a barren habitat until a suitable habitat is formed
- C. a process whereby animals occupy a barren habitat until a suitable habitat is formed
- D. the subsequent taking over of the land through emigration or dispersal of seeds
- E. the replacement of weaker plants and animals by stronger ones
Which of the following may not contribute to environmental pollution?
- A. Solar energy radiation
- B. Industrial waste
- C. Waste disposal
- D. Smoke
- E. Nuclear power plant
Species do not change in order to survive. The environment determines which organism survives to reproduce. These statements
- A. explains theory of acquired characters
- B. supports Jean Lamarck's theory of use and disuse
- C. support the idea of survival of the fittest
- D. are refuted by fossil record
- E. imply that organisms modify their environment in order to survive