Agricultural Science JAMB, WAEC, NECO AND NABTEB Official Past Questions

43

Cassava and sugarcane are mainly propagated by

  • A. seeding
  • B. layering
  • C. budding
  • D. cutting
  • E. grafting
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44

An effective control method of the citrus moth is

  • A. hand-picking of the moth
  • B. spraying with fungicide
  • C. use of predators
  • D. delayed planting
  • E. timely harvesting of ripe fruits
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45

Breeding in self-pollination crops can be regarded as

  • A. line breeding
  • B. cross-breeding
  • C. inbreeding
  • D. hybridization
  • E. back-crossing
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46

The symptoms of coffee leaf rust are

  • A. leaf spots, loss of vigour and death of the leaves
  • B. wilting and death of plant
  • C. damping off and etiolation
  • D. leaf spots and damping off
  • E. etiolation and death of plant
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47

To which of the following crops does the term ginning apply?

  • A. oil palm
  • B. cocoa
  • C. groundnut
  • D. cotton
  • E. coconut
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48

Which of the following crops does not require nursery preparation?

  • A. rice
  • B. tobacco
  • C. tomato
  • D. okra
  • E. pepper
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49

Cassava mosaic virus can be controlled by

  • A. spraying of fungicides
  • B. inoculation of the plant
  • C. spraying with insecticides
  • D. treatment of stem cuttings
  • E. growing resistant varieties
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50

The botanical name of giant star grass is

  • A. andropogon tectorus
  • B. pennisetum purpureum
  • C. panicum maximum
  • D. cynodon plectostachyum
  • E. chloris gayana
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51

Which of the following should be checked daily before using a tractor?

  • A. engine oil
  • B. spark plug
  • C. distributor
  • D. air cleaner
  • E. battery
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52

Which of the following is not an effect of badly arranged farm?

  • A. efficient management
  • B. time wastages
  • C. expensive labour
  • D. low output
  • E. low profit
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53

Which of the following is not a disadvantages of wind power?

  • A. its supply is sporadic
  • B. its source is the wind
  • C. it is very expensive
  • D. the supply is uncertain
  • E. the amount of power produced is small
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54

Which of the following farm operations cannot be mechanized?

  • A. weed control
  • B. fertilizer application
  • C. transportation and handling
  • D. seed-germination
  • E. crop processing
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55

One of the limitation of machanization of farms is

  • A. reduction in the cost of production
  • B. exposure of soil to the effects of climate
  • C. increase in yield of crops
  • D. reduction of farm labour
  • E. cultivation of more area of land
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56

Which of the following is the source of energy used by green plants for photosynthesis?

  • A. electricity
  • B. water
  • C. wind
  • D. sun
  • E. machine
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57

Which of the following problems will not be considered before installing irrigation equipment in a farm?

  • A. high cost of equipment and maintenance
  • B. concentrartion of salt
  • C. source of power
  • D. availability of water
  • E. build-up of pest and diseases
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58

The physical properties of soil include the following except

  • A. bulk density
  • B. colour
  • C. moisture content
  • D. porosity
  • E. PH
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59

Which of the following processes will not lead to the loss of nutrients from the soil?

  • A. erosion
  • B. mulching
  • C. harvesting
  • D. burning
  • E. leaching
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60

A soil which consists of a mixture of and, silt and clay in equal quantities is described as

  • A. humus
  • B. alluvial soil
  • C. sandy clay
  • D. loam
  • E. clayey loam
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61

Which of the following statement is not correct about micronutrients? They

  • A. are required in small quantities by plants
  • B. are harmful when present in large quantities in a soil
  • C. are derived from the parent rocks
  • D. are the most abundat elements in plant leaves
  • E. act as catalysts and co-enzymes in growing plants
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62

A soil with the PH range of 6.1 to 6.9 can be described as

  • A. alkaline
  • B. very acidic
  • C. slightly alkaline
  • D. slightly acidic
  • E. neutral
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63

Which of the following is not a way of maintaining soil fertility?

  • A. cover cropping
  • B. manuring
  • C. mulching
  • D. mixed farming
  • E. monocropping
View Answer & Discuss WAEC 1993