JAMB - Agricultural Science (2015)

• 1

  The process of grafting in crop production involves

  回答

  (D)

  The joining of two parts from related crops.
• 2

  If the recommended spacing for a tree crop is 2.5cm by 4.0m determine the number of seedlings required to plant a 2-hectare farmland.

  回答

  (B)

  2,000
• 3

  A regulatory control of diseases in crop production is

  回答

  (B)

  quarantine
• 4

  Which of the following statements about soil organisms is false?

  回答

  (A)

  Soil pH will affect the population of soil organisms
• 5

  The data for feed consumption and weighing gain of four farm animals labelled P, Q, R and S are shown below.
  P -50kg feed consumed and 20kg weight gained Q -90kg feed consumed and 30kg weight gained R -100kg feed consumed and 25kg weight gained S - 150kg feed consumed and 30kg weight gained.
  
  
  Which of the following must efficient feed converter?

  回答

  (A)

  P
• 6

  In preparing for parturition of a sow, warmth should be provided to

  回答

  (D)

  prevent chilling of the young.
• 7

  In which layer of the soil profile do most biological activities occur?

  回答

  (D)

  A-horizon
• 8

  Which of the following statements about agricultural development are true? It leads to
  
  I. increased processing of produce
  II. Increased food production.
  III. High productivity.
  IV. Increased agricultural labour force.

  回答

  (A)

  I, II and III only
• 9

  Under the communal land tenure system, farmers find it difficult to secure loans because

  回答

  (C)

  land holdings cannot be used as security
• 10

  Pineapple is widely propagated using

  回答

  (B)

  suckets
• 11

  The correct sequence for the use of coupled implements for land preparation is

  回答

  (A)

  Plough, harrow and ridger
• 12

  The correct sequence of feed utilization in farm animals is

  回答

  (B)

  ingestion-digestion-assimilation-absorption
• 13

  Which of the following statements is a disadvantage of human power? It

  回答

  (D)

  has low output.
• 14

  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

  回答

  (C)

  I, II and IV only
• 15

  Which of the following properties of soil determines its water-holding capacity?
  
  I. Texture
  II. pH
  III. Colour
  IV. Structure

  回答

  (B)

  I and IV only
• 16

  Which of the following diseases commonly occurs during brooding?
  
  I. Yolk sac infection
  II. Coccidiosis
  III. Fowl pox
  IV. Pullorum

  回答

  (C)

  I, III and IV only
• 17

  A detrimental effect of bush burning is that it

  回答

  (A)

  destroys soil organic matter
• 18

  Government plays roles in the development of agriculture through the following means except

  回答

  (B)

  training of farmer's children
• 19

  Sexual maturity in farm animals is not influenced by their

  回答

  (D)

  wearing age
• 20

  Which of the following factors does not influence the distribution of cattle in West Africa?

  回答

  (B)

  Light
• 21

  Close to the time of harvesting of cotton, sunshine is needed to ensure the production of bolls that are

  回答

  (B)

  Bright
• 22

  Agriculture contributes to the economy of West African countries through the following means except

  回答

  (B)

  Supply of armament for territorial defence
• 23

  In animal production, newly-born rabbits are called

  回答

  (A)

  Bunnies
• 24

  Which of the following crops has a fibrous root system?

  回答

  (D)

  sugarcane
• 25

  Which of the following insects transmits swollen shoot disease of cocoa?

  回答

  (B)

  Mealybug
• 26

  Soil water that is available for root absorption at field capacity is

  回答

  (A)

  Capillary water
• 27

  The weight of a sheep increased from 25kg to 45kg in two months.
  
  If the total consumption during the period was 60kg. Determine the feed conversion ratio

  回答

  (C)

  3 : 1
• 28

  Which of the following statements is correct about micro-nutrients? They

  回答

  (B)

  are required by plants in very small quantities
• 29

  Yellow colouration of the lower leaves of a growing maize plant may be due to deficiency in

  回答

  (B)

  phosphorus
• 30

  The following crops will enrich the soil with nitrates except

  回答

  (D)

  Axonopus
• 31

  The instrument which enables a surveyor to find the direction of a base line is

  回答

  (D)

  magnetic compass
• 32

  In crop production, ginger is propagated by

  回答

  (C)

  rhizome
• 33

  Tomatoes are staked in order to

  回答

  (A)

  accelerate their growth
• 34

  Crop rotation decreases the incidence of pests by

  回答

  (A)

  breaking life cycles of pests
• 35

  The following are advantages of sub-surface irrigation except that

  回答

  (D)

  it reduces the incidence of pests
• 36

  Which of the following groups of rocks is formed as a result of volcanic eruption?

  回答

  (B)

  Basalt, granite and pumice
• 37

  Poaching is prohibited in game reserves to

  回答

  (B)

  conserve wildlife
• 38

  If T represents the gene for tallness while t represents dwarfness
  
  The genotypic ratio of the second filial generation will be

  回答

  (A)

  3 : 1
• 39

  The forest management system which involves the planting of both food crops and forest trees on the same piece of land at the same time is known as

  回答

  (B)

  Taungya
• 40

  If T represents the gene for tallness while t represents dwarfness
  
  When a tall (TT) crop is crossed with a dwarf (tt) crop, the resultant crops will be

  回答

  (B)

  100% tall
• 41

  Corns, rhizomes and tubers are examples of

  回答

  (A)

  underground stems
• 42

  A sow that is not producing milk after farrowing should be given

  回答

  (A)

  oxytocin
• 43

  The main objective of establishing forest in the arid region is to

  回答

  (A)

  check desert encroachment
• 44

  The data for feed consumption and weighing gain of four farm animals labelled P, Q, R and S are shown below.
  P-50kg feed consumed and 20kg weight gained Q-90kg feed consumed and 30kg weight gained R-100kg feed consumed and 25kg weight gained S - 150kg feed consumed and 30kg weight gained.
  
  The feed conversion efficiency of the poorest weight gainer is

  回答

  (A)

  0.4
• 45

  Piglet anaemia can be controlled by using

  回答

  (B)

  iron drugs