31. The complex relationship between the members of a community and their physical environment is known as________
- A. commensalism
- B. symbiosis
- C. saprophytism
- D. ecology
32. The specific role of a species within its environment is known as its_________
- A. habitat
- B. niche
- C. trophic level
- D. biotic community
33. Which of the following soil fertility improvement methods will have the most negative effect on the ecosystem if not controlled?
- A. Application of N-P-K fertilizer
- B. Shifting cultivation
- C. Mixed farming
- D. Crop rotation
34. Organisms in an ecosystem are usually grouped according to their trophic level into__________
- A. carnivores and omnivores,
- B. consumers and parasites
- C. producers, and saprophytes
- D. Producers and consumers
35. 
In the pyramid of energy illustrated above, the organism with the least amount of transferred energy is___________
- A. Spirogyra
- B. Tadpole
- C. Fish
- D. Bird
36. Tall trees with unbranched trunks which grow above the upper storey of the forest are commonly referred to as _____
- A. Emergents
- B. Herbs
- C. Lianes
- D. Shrubs
37. Maize grains are best stored against insect attacks by__________________
- A. keeping in a silo
- B. storing in the room
- C. leaving them on their cobs
- D. covering with leaves
38. Cholera is mostly spread by_______
- A. air
- B. soil
- C. water
- D. noise
39. Which of the following resources is renewable?
- A. Petroleum
- B. Coal
- C. Iron
- D. Trees
40. Which of the following roles is not performed by a government agency responsible for forest maintenance?
- A. Regulating the harvest of timber and poaching
- B. Creating, protecting and managing the forest reserves
- C. Tracking the movement of timber, wood, and wildlife
- D. Regulating mining activities in the forest
41. Which of the following factors is not a source of variation in living organisms?
- A. Environment
- B. Inheritance
- C. Mitosis
- D. Meiosis
42. Individuals with blood group AB can donate blood to individuals with blood group(s)___________
- A. A and B
- B. A and O
- C. AB only
- D. O only
43. 
The diagram above is an illustration of a process occurring in a living animal cell. Study it and answer this question
The process occurs in the _______
- A. Nucleus
- B. Mitochondrion
- C. Golgi body
- D. Cytoplasm
44. The process is called_______
- A. replication
- B. cell maturation
- C. crossing over
- D. mutation
45. Which of the following nucleotides is not found in the DNA molecules?
- A. Adenine
- B. Cytosine
- C. Guanine
- D. Uracil
