31. Which of the following instruments is used to determine the turbidity of water?
- A. hygrometer
- B. hydrometer
- C. secchi disc
- D. rain gauge
32. In an ecosystem, the least efficient energy transfer link is from the
- A. secondary consumers to decomposers
- B. sun to producers
- C. primary consumers to secondary consumers
- D. producer to primary consumers
33. Xerophytes have the following characteristics aimed at conserving water except
- A. thick cuticle
- B. broad leaf surfaces
- C. sunken stomata
- D. waxy cuticle
34. An association between living organisms in which one lives on and feeds at the expense of the other is known as
- A. commensalism
- B. predation
- C. parasitism
- D. mutualism
35. When large numbers of organisms share limited space and resources, the immediate result is
- A. extinction
- B. emigration
- C. competition
- D. immigration
36. Which of the following disease ic caused by a bacterium?
- A. ringworm
- B. poliomyelitus
- C. syphilis
- D. malaria
37. Conservation of wildlife is necessary mainly because
- A. wild species cannot resist disease better than their domesticated species
- B. many predator wild animals help in the control of pests
- C. it prevents extinction of species
- D. many people derive pleasure from observing wild animals
38. Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with the blood from the same donor . Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.
Patients X and Y were likely transferred with blood of genotype
- A. OO
- B. AO
- C. BO
- D. AA
39. Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with the blood from the same donor . Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction.
What should the hospital have done to prevent X from showing the symptom described above? Patient X should have
- A. undergone an agglutination test
- B. been asked for the blood group
- C. been screened for HIV
- D. undergone malaria test
40. The greatest contribution to genetic studies was made by
- A. Gregor Mendel
- B. Thomas Morgan
- C. Charles Darwin
- D. Robert Hooke
