31. Rabbits cannot survive in an aquatic habitat because they have
- A. fore and hind limbs
- B. no gills
- C. no fins
- D. no scales
32. Which of the following substances pass through the root cell membrane by osmosis?
- A. Ceil sap
- B. Carbon dioxide
- C. Oxygen
- D. Water
33. Trees in Savanna habitats usually have thick bark which mainly.
- A. Reduces the rate of transpiration
- B. Protect them from scorching sun
- C. Protect them from heavy winds
- D. Resist bush fires
34. Competition among individuals of a population increases the
- A. Number of organisms
- B. Availability of nutrient supplied
- C. Survival of the fittest
- D. Enlargement of the territory
35. In natural selection, Darwin proposed that evolution occurred because of the following conditions except
- A. that nature selects those that will survive to reproduce their kind
- B. there is a fierce competition among the offspring
- C. that the weaker offspring are eliminated
- D. food and other needs are abundant
36. Which of the following substances has the highest amount of energy in joules per unit weight?
- A. Carbohydrates
- B. Fats
- C. Proteins
- D. Vitamins
37. Which of the following pairs of scientists discovered the Rhesis factor in human blood?
- A. Hooke and Lavine
- B. Darwin and Landsteiner
- C. Landsteiner and Lavine
- D. Hooke and Darwin
38. The study of an individual organism or a single species of organism and its environment is
- A. Artecology
- B. Ecological concepts
- C. Synecoloy
- D. Biotic composers
39. Which of the following is a nitrifying bacterium?
- A. Rhizobium
- B. Nictrobacter
- C. Azotobacter
- D. Pseudomonas
40. Which of the following is the effect of using artificial pollination in plant breeding?
- A. Production of healthy crops
- B. Lengthening the maturity time of crops
- C. Making crops susceptible to disease
- D. Improvement of the variety of crops
