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
Correct Option: Answer is B
Rabbits does not have the adaptive features of an aquatic habitat like gills therefore, it cannot survive in an aquatic habitat.
32. Which of the following substances pass through the root cell membrane by osmosis?
- A. Ceil sap
- B. Carbon dioxide
- C. Oxygen
- D. Water
Correct Option: Answer is D
Water passes through the root cell membrane of plant in order for osmosis to take place
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
Correct Option: Answer is A
Rate of transpiration is reduced in savannah forest due to thick barks of the trees in savannah forest.
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
Correct Option: Answer is C
Competition one of the biotic factors in ecological factors involves the interactions among two organisms of the same species/different species which outgrows the other and survives while the other cannot grow or survive
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
Correct Option: Answer is D
In natural selection, Darwin proposed that evolution occurred because of the following conditions except 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
Correct Option: Answer is B
Fats provides more energy to animal than carbohydrates therefore containing the highest amount of energy in joules per unit weight.
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
Correct Option: Answer is C
Landsteiner and Lavine are scientist, they discovered the Rhesus factor in human blood.
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
Correct Option: Answer is A
Artecology is the study of an individual organism or a single specie of organism and no environment
39. Which of the following is a nitrifying bacterium?
- A. Rhizobium
- B. Nictrobacter
- C. Azotobacter
- D. Pseudomonas
Correct Option: Answer is B
Nitrobacter are chemoautrophic organisms found in soil and water responsible for the oxidation of ammonium to nitrite and nitrite to nitrate.
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
Correct Option: Answer is D
One of the effect of using artificial pollination in plant breeding is that it improves the variety of crops.