Yellow colouration of the lower leave of a growing maize plant may be due to deficiency in
- A. potassium
- B. phosphorus
- C. zinc
- D. nitrogen
A regulatory control of diseases in crop production is
- A. rouging
- B. quarantine
- C. crop rotation
- D. soil tillage
In crop production, ginger is propagated by
- A. seed
- B. bulb
- C. rhizome
- D. corm
Tomatoes are staked in order to
- A. accelerate their growth
- B. induce flowering
- C. accelerate fruit ripening
- D. prevent rotting of fruits
Corms,rhizomes and tubers are examples of
- A. underground stems
- B. underground roots
- C. modified leaves
- D. earial stems
The correct sequence for the use of coupled implements for land preparation is
- A. plough,horrow and ridger
- B. harrow,ridger and plough
- C. plough,ridger and harrow
- D. harrow,plough and ridger
The use of animal traction is limited in the forest zones of West Africa because of the
- A. topography of the forest land
- B. presence of tsetseflies
- C. high amount of rainfall
- D. culture of the people
Limitations of farm mechanization in West Africa do not include
- A. land fragmentation
- B. high capital investment
- C. availability of spare parts
- D. high level technical know-how
The instrument which enables a surveyor to find the direction of a base line is
- A. abney level
- B. ranging pole
- C. plumb bob
- D. magnetic compass
Which of the following statement is a disadvantage of human power? it
- A. controls other sources of farm power
- B. brings about least damage
- C. is easily available and controlled
- D. has low output
The following are advantages of sub-surface irrigation except that
- A. it is suitable for soils with low water holding capacity
- B. it can be used only for specific types of crops
- C. the rate of evaporation is greatly reduced
- D. it reduces the incidence of pests
The following fertilizers can be used to neutralize soil acidity except
- A. wood ash
- B. ammonium nitrate
- C. limestone
- D. calcium phosphosilicate
Which of the following groups of rocks is formed as a result of volcanic eruption?
- A. lomestone,basalt and shale
- B. basalt,granite and pumice
- C. sandstone,granite and quartzite
- D. marble,gneiss and shale
The following crops will enrich the soil with nitrates except
- A. calopogonium
- B. pueraria
- C. centrosema
- D. exoriepus
A detrimental effect of bush burning is that it
- A. destroys soil organic matter
- B. destroys weed seeds
- C. sterilizes the soil
- D. adds potash to the soil
Which of the following statements about soil organisms is false?
- A. soil pH will attack population of soil organisms
- B. population of soil living organisms is increased with increase in soil organic matter
- C. soil with good texture and structure cannot harbour soil microbes
- D. soil temperature affects the activities of soil organisms
Which of the following properties of soil determines its water-holding capacity? I. Texture II. pH III. Colour IV. Structure
- A. I and II only
- B. I and IV only
- C. II and III only
- D. III and IV only
Which of the following statements is correct about micro-nutrients? They
- A. promote formation of only root nodules
- B. are required by plants in very small quantities
- C. are fixed into the soil through microbial activity
- D. increase crop tolerance to pest attack
In which layer of the soil profile do most biological activities occur?
- A. D-horizone
- B. C-horizone
- C. B-horizone
- D. A-horizone
Which of the following factors are causes of deforestation in West Africa? I. expansion of cultivated land II. high population growth rate III. conservation of wildlife in game reserves IV. urban growth
- A. I,II and III only
- B. II,III and IV only
- C. I,II and IV only
- D. I,II,III and IV
Soil water that is available for root absorption at field capacity is
- A. capillary water
- B. hygroscopic water
- C. gravitational water
- D. superfluous water