Adaptive radiation as illustrated by the variety of forms in insects can be regarded as
- A. behavioral modification
- B. a case of rapid population growth
- C. a physiological process
- D. an evidence of evolution
- E. a population control mechanism
The precondition for transfusion of blood to an accident victim is
- A. seeking the consent to his parents
- B. ascertaining the religious belief of the victim
- C. cross-matching the blood group of the donor with that of the accident victim
- D. curing the donor of any disease traced in his blood
- E. rewarding the donor with food and money.
The genetic make-up of an organism is described as its
- A. phenotype
- B. genotype
- C. character
- D. chromosome
- E. allele
A pair of genes which controls a trait is described as?
- A. dominant
- B. recessive
- C. allele
- D. variant
- E. hybrid
When gametes from pure breeding parents with contrasting features such as tallness and shortness are
involved in monohybrid cross, the offspring in the first filial generation are usually
- A. pure breed
- B. heterozygous dominant
- C. homozygous recessive
- D. mutants
- E. co-dominant
Thrombocytes are blood cells responsible for initiating
- A. phagocytosis of bacteria
- B. synthesis of ribosomes
- C. clotting of the blood
- D. immunity to certain infectious diseases
- E. removal of carbondioxide from tissues.
Water rises most rapidly in
- A. sandy soil
- B. clayey soil
- C. sandy-loam soil
- D. loamy soil
- E. humus soil
The conservation of natural resources can be achieved by the following except
- A. creation of national parks
- B. formation of conservation societies and agencies
- C. establishment of game reserves
- D. deregulated harvesting
- E. making laws on conservation
Water in the human body is derived from the following sources except through
- A. drinking water
- B. food substances
- C. cytoplasm of worn-out cells
- D. respiratory activity
- E. absorption by the skin
Which of the following processes are involved in a water cycle?
- A. Evaporation, condensation and precipitation
- B. Evaporation, percolation and transpiration
- C. Evaporation and precipitation
- D. Evaporation and transpiration
- E. Precipitation and condensation.
Which of the following processes is not involved in the carbon cycle?
- A. Burning
- B. Decay
- C. Transpiration
- D. Respiration
- E. Photosynthesis
Changes in energy flow between organisms in a habitat can be represented by a
- A. pyramid of biomass
- B. pyramid of numbers
- C. pyramid of energy
- D. food chain
- E. food web
Which of the following types of soil has the highest water-retaining capacity?
- A. Clay
- B. Laterite
- C. Loam
- D. Gravel
- E. Sand
Which of the following factors is not associated with aquatic habitat?
- A. Temperature
- B. Light intensity
- C. Turbidity
- D. Wave action
- E. Humidity.
Which of the following is not a way of reducing air pollution?
- A. Siting factories and power stations away from residential areas
- B. Building tall factory chimneys
- C. Passing waste gases through filters and absorbers
- D. Using lead-free petrol in cars
- E. Recycling tins, cans and bottles
Which of the following is an autotrophic mode of nutrition?
- A. Chemosynthesis
- B. Saprophytism
- C. Parasitism
- D. Symbiosis
- E. Commensalism
Which of the following reagents is used for the test for starch?
- A. Million’s reagent
- B. Fehling’s’ solution
- C. Sudan III
- D. Iodine solution
- E. Benedict’s solution
Which of the following is a nitrifying bacterium
- A. Nitrobacter
- B. Rhizobium
- C. Azotobacter
- D. Clostribium
- E. Nitrosomonas
Thunderstorm can be beneficial to plants because it
- A. kills the pest that attacks crops
- B. destroys some of the major crops
- C. adds nitrates to the soil
- D. adds lime to the soil
- E. makes rain water available to plants
A dry indehiscent fruit containing one seed and possessing a hairy pappus is described as
- A. a nut
- B. a drupe
- C. a cypsela
- D. a follicle
- E. an achene
Which of the following is the effect of using artificial pollination in plant breeding?
- A. Production of healthy crops
- B. Improvement of the variety of crops
- C. Making crops susceptible to diseases
- D. Lengthening the maturity time of crops
- E. Encouraging competition amongst crops