The most important reason for encouraging afforestation in the arid regions of West Africa is to
- A. provide timber for building purposes
- B. provide shelter for wildlife
- C. produce medical plants
- D. serve as wind break
An important forage crop in West Africa is
- A. maize
- B. rice
- C. giant star grass
- D. guinea corn
Which of the following groups of crops is widely frown in areas with high rainfall?
- A. cocoa,oilpalm,rubber and kola
- B. millet,onoin,cotton and sorghum
- C. coffee,cocoa,cotton and millet
- D. rubber,onion,oil palm and cotton
Which of the following crops requires shade in the early stages of its growth in the field?
- A. coconut
- B. banana
- C. cotton
- D. cocoa
The process of inducing root development on portions of stems still attached to the parent plant is known as
- A. budding
- B. grafting
- C. layering
- D. tillering
Sexual propagation involves the use of
- A. buds
- B. seeds
- C. cuttings
- D. vines
Which of the following is an advantage of mechanization?
- A. carrying out many farm operations with ease
- B. displacing many farm workers
- C. exposing soil to direct effect of sunlight and erosion
- D. polluting the environment with industrial gases and wastes
The daily maintenance practice carried out on a disc harrow is
- A. changing the disc
- B. cleaning the soil off the disc
- C. smearing the disc with oil
- D. sharpening the edges of its scraper
The most appropriate farm implement for breaking up soil clod is the
- A. harrow
- B. plough
- C. ridger
- D. mower
Animal power is usually used on the farm for
- A. harvesting
- B. spraying
- C. ploughing
- D. planting
Which of the following sources of power supply to the farm is most unreliable?
- A. wind
- B. electricity
- C. animal
- D. machine
Which of the following sources of farm power is most flexible and adaptable to farm operations?
- A. animal power
- B. wind power
- C. human power
- D. solar power
Which of the following sources of water is least useful for irrigation purposes?
- A. sea
- B. river
- C. lake
- D. borehole
When soils are poorly drained,
- A. they dry up easily
- B. they form hardpans
- C. the air content of the soil is reduced
- D. the rate of decomposition is accelerated
Which of the following is not an effect of water-logging on crop production? it
- A. inhibits plant development
- B. encourages leaching
- C. inhibits the activities of micro organisms in the soil
- D. causes plant roots to wilt
In the process of recycling carbon in nature, carbondioxide is used by crops during
- A. respiration
- B. decomposition
- C. photosynthesis
- D. transpiration
Nitrogen is taken up by plant roots in the form of
- A. nitrate ion
- B. nitrite ion
- C. nitric acid
- D. nitrogen gas
Which of the following describes the effects of excessive nitrogen application on the growth of maize plants?
- A. high vegetative growth with low yield
- B. high vegetative growth with high yield
- C. low vegetative growth with high yield
- D. low vegetative growth with low yield
An acidic soil can be neutralized by the addition of
- A. urea
- B. ammonium sulphate
- C. wood ash
- D. laterite
The most important factor that limits agricultural production in West Africa is
- A. temperature
- B. wind
- C. rainfall
- D. light