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WAEC: AGRICULTURAL SCIENCE

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Quiz 2 of 2

2021 Agricultural Science WAEC Theory Past Questions

WAEC: AGRICULTURAL SCIENCE 2021 Agricultural Science WAEC Theory Past Questions

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2021 Agricultural Science WAEC Theory Question 1

ANSWERS

(1) (a) (i) Agricultural Education

  • Establishment of adult education.
  • Sensitizing farmers on the importance of being educated.

(ii) Agricultural Extension Services

  • Employment of extension officers to sensitize farmers.
  • Funding of extension programmes.

(iii) Agricultural Policies and Programmes

  • Government should make policies that will favour farmers and discourage foreign counterparts.
  • Government should create a good marketing channel for the distribution of farm produce.

(b)

(c)

  • It destroys soil structure.
  • It may result in erosion.
  • It causes compaction due to its heavy weight.
  • It affects the fertility of the soil.
2021 Agricultural Science WAEC Theory Question 2

ANSWER

(a) Time

  • It determines whether or not the soil is well developed.
  • It takes a shorter time in the formation of immature soil.
  • It also takes a long time for plants to decay and become part of the soil.

Rainfall

  • It provides water for hydrolysis.
  • It helps to break down some parent rocks to form soil.
  • It enhances vegetative growth of plants whose roots cause further breakdown.

Parent Material

  • They constitute major materials from which soil is formed.
  • It determines the chemical compositions of the soil formed.
  • Its hardness affects the rate of soil formation.

(b) – Most exhaustive crops should be followed by less exhaustive.

–  Non-uniform of crops

– Deep rooted crops should be succeeded by shallow rooted crops

– Leguminous crops should be grown after non-leguminous crops.

(c) – It serves as a cover crop

– It serves as food for livestock

– It is used as green manure

– It helps to prevent erosion

– It is used for roofing farmstead

2021 Agricultural Science WAEC Theory Question 3

ANSWERS

(a) (i) Selective exploration is the process of cutting or harvesting only mature trees in a forest. It is a way of concentrating certain selected species of timber in a forest reserve. The system allows for the harvesting of older trees while the younger ones remain as cover to the surface of the forest.

(ii) – It ensures the concentration of selected species of timber in a forest.

– It protects the soil from erosion.

– It ensures the continuous supply of timber.

– It serves as a revenue base for the government.

(b) Field pest of crops can be described as an organism, whether plant or animal which causes economic damage to crop plants, livestock, etc. while storage pests of crops are insects or other animals that damage or destroy stored foods or other stored valuable organic matters.

(c)

Storage Insect Pests of Crops

  • Beetle
  • Moths
  • Rodents

Field Insect Pests of Crops

  • Locusts
  • Caterpillar insect
  • Grasshopper

(d)

  • Mulch planting beds with newspaper, leaves, bark or wood chips. Mulches retain soil moisture and improve soil quality.
  • Water your plantings with a soaker hose or a drip irrigation system.
  • Use a timing device with any watering system.
  • Use “wasted” water for your plants.
2021 Agricultural Science WAEC Theory Question 4

ANSWERS

(a) (i) Pruning of Cocoa Trees

  • It optimizes the balance of vegetative and reproductive growth.
  • It increases the efficiency of fertilization and pest control.
  • It helps in prevention and treatment of disease.
  • It reduces risk of failure from dead or weak branches.

(ii) Parboiling of Paddy Rice

  • To increase the total and head yield of the paddy.
  • To prevent the loss of nutrients during milling.
  • To salvage wet or damaged paddy.
  • To prepare the rice according to the requirements of consumers.

(b) – By use of chemicals such as herbicides

– By weeding

– By cultural practices

– By use of good tillage operation

– Use of resistant varieties.

(c) – They are used to enhance the beauty of a garden or home.

– They are grown for food. Some chilies are grown as ornamental plants. An example is capsicums.

– Some ornamentals can be used for medical purposes. Examples of ornamental herbs are Rosemary, Mexican marigold, and Lemon grass.

– They absorb carbon dioxide from the air and output oxygen thereby creating cleaner air.

– Fallen leaves of ornamental plants makes good mulch and compost.

2021 Agricultural Science WAEC Theory Question 5

ANSWERS

(a)

(b) – Highest feed conversion ratio is G =22

–  Lowest feed conversion is H = 2.3

(c)

  • Milk
  • Meat
  • Hides and skin
  • Egg
  • Blood

(d)

  • Hydration
  • Carbonation
  • Hydrolysis
2021 Agricultural Science WAEC Theory Question 6

ANSWERS

(a) (i) Main Agricultural Extension Methods that could be used to create awareness of the disease among Poultry Farmers.

  • Individual method
  • Group method
  • Mass media

(ii) Most Appropriate Method

  • Individual method

(iii) Reasons for the Choice of the Extension Mentioned

  • It gives the poultry farmers a proper understanding of the disease.
  • It will enhance practicing.

(iv) Problems that Could be Encountered in the Use of the Extension Method Mentioned

  • Inability to reach many poultry farmers
  • It is a time consuming method
  • It may be very expensive

(b)

  • Inadequate farm input
  • Inadequate funds
  • Inadequate skilled labour
  • Problem of distribution
  • Inadequate farm machines

(c)

  • Red Sokoto
  • West African dwarf
  • Sahel
  • Nigerian dwarf goat.

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