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

43

Groundnut grows best on a

  • A. well-drained,light sandy-loam soil
  • B. well-drained,clayey friable soil
  • C. swampy,sandy-clay soil
  • D. well-drained,clayey-loam soil
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44

swollen shoot disease of cocoa is caused by

  • A. virus
  • B. fungus
  • C. bacteria
  • D. nematode
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45

A vegetatively propagated citrus plant will produce fruits earlier than the one established from seeds because

  • A. it would not suffer from gummosis disease
  • B. insect pests do not attack it
  • C. it is more advanced at the time of establishment
  • D. the flowers are wind pollinated
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46

Tomato plants are staked for the following reasons except to

  • A. produce clean fruits
  • B. reduce pest damage to fruits
  • C. increase the yield
  • D. improve the taste
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47

The main reason for removing the barks of cassava tubers before processing the tuber is to

  • A. reduce the water content
  • B. improve the protein content of products
  • C. improve the shelf life of products
  • D. reduce the cyanide content of products
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48

Perboiling in the processing of rice

  • A. improves its digestibility
  • B. increaese grain mass
  • C. reduces the percentage of breakage
  • D. facilitates the polishing of rice
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49

During photosynthesis, green plants convert carbon dioxide to

  • A. chlorophyll
  • B. carbohydrate
  • C. protein
  • D. carbonic acid
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50

The term supplying in crop production means

  • A. pruning excess branches of crops
  • B. spacing out crops during planting
  • C. replacing ungerminated seeds on seedbeds
  • D. adding enough fertilizer to the crop
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51

Which of the following statement about farmstead planning is false?

  • A. administartive blocks should not be located close to the entrance of the farmstead
  • B. waste disposal unit should be located far away from the main farm area
  • C. all buildings should be well ventilated with good lightings
  • D. animal pens should not be located too close to the worker's house
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52

A farm surveying equipment made of steel and used for measuring short distance is called

  • A. prismatic compass
  • B. measuring tape
  • C. gunter's chain
  • D. theodolite
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53

An incubator is important in supplying

  • A. heat for day-old chicks
  • B. heat for embryo develoment
  • C. light for cadling eggs
  • D. feed to chicks
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54

The implement used for pulverizing the soil is the

  • A. planter
  • B. ridger
  • C. horrow
  • D. plough
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55

Considering all costs, the cheapest source of energy for domestic use is

  • A. eloectricity
  • B. sunlight
  • C. biogas
  • D. water
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56

Excessive drainage of soil water can be checked by the addition of adequate quantities of

  • A. N.P.K 15 - 15 - 15
  • B. sulphate of ammonia
  • C. single superphosphate
  • D. compost manure
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57

The following equipment can be used for irrigation except

  • A. bucket
  • B. watering can
  • C. knapsack sprayer
  • D. siphon tube
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58

A farmer applied NPK 15:11:8 at planting. What is the percentage of potassium in the fertilizer?

  • A. 23.53%
  • B. 32.35%
  • C. 33.33%
  • D. 44.12%
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59

Which of the following statements about bush burning is false?

  • A. it releases mineral nutrients bound in plant tissues
  • B. it encourages the growth of fresh grasses
  • C. the heat generated destroys pests
  • D. the heat generated increases the population of soil organisms
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60

sources of nitrogen to the soil include the following except

  • A. lightening
  • B. urea
  • C. blue-green algae
  • D. residues of burning activities
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61

Which of the following crops should be planted on a piece of land that has been repeatedly cropped with maize?

  • A. guinea corn
  • B. millet
  • C. rice
  • D. cowpea
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62

Which of the following statement is not true about waterlogged soils?

  • A. such soils are heavily leached
  • B. dentrifying bacteria are more active in such soil than nitrifying bacteria
  • C. nitrosomonas yield bet in such soils
  • D. soil temperature is usually low
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63

The three most important physical factors that influence rock weathering are

  • A. colour,particle size and hardness of rock
  • B. particle size,hardness and degree of cementation
  • C. hardness,degrss of cementation and colour
  • D. particle size, temperature and colour
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