2023 Waec Agric science Obj & Theory Expo Answers Now Available

Waec Agric science Obj & Theory Expo 2023 – May/June now Available 

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Waec Agric science Obj & Theory Expo Answers For last year 2022





(i) Provision of storage facilities

(ii) Provision of processing facilities

(iii) Establishment of marketing board

(iv) Government should buy to sell at subsidized price

(v) Encouragement of crop export



(i) Hoe, Cutlass

(ii) Hand trowel, Cutlass

(iii) Harvesting knife, Sickle, Dibble

(iv) Milking machine, Sheller



(i) Economic limitation

(ii) High cost of purchase/maintenance

(iii) Inadequate technical know-How

(iv) Most farmers are illiterate

(v) lack of maintenance culture




Irrigation is the artificial application of water to the soil through various systems of tubes, pumps, and sprays for farming purposes.



(i) It increases crop productivity vir crop yield.

(ii) Irrigation provides humid environment for the breeding of pest and pathogens of crops.

(iii) It assists in facilitating crop production all year round.

(iv) It soften the soil for east tillage operation.

(v) It also cools the soil by reducing the soil temperature during the dry season when the soil temperature I very high. Plant growth is thus improved.




(i) The amount of water supplied is regulated.

(ii) It economizes the use of water.

(iii) it is costly to construct and operate.



(i) The volume of water, especially in flooding, may be difficult to control.

(ii) It removes excess water caused by heavy rainfall especially in heavy soils.

(iii) It is easier to construct and operate.



[Pick Any FIVE]

(i) Agriculture provides market for industrial products, e.g. farm machinery, chemicals, fertilizer, etc.

(ii) Provides food to industrial workers.

(iii) Both agriculture and industry compete for labour.

(iv) Agricultural development allows for a shift of factors of production to the industry.

(v) Rise in agricultural income due to efficient and economic factor combination brings about development of the industrial sector of the economy.

(vi) Industries provide a large range of d desirable things that farmers want to buy.

(vii) Agriculture provides the raw materials for industries.

(viii) Industries produce agrochemicals for agricultural uses, e.g. pesticides, fertilizers, vaccines, herbicides etc.

(ix) Industries provide storage facilities for agricultural produce, d e.g. pesticides, fertilizers, vaccines, herbicides etc.

(x) Industries provide processing facilities for agricultural produce.

(xi) Industries produce machinery and equipment for agricultural uses e.g. tractors, ploughs, cutlasses, hoes, etc.



(i) Leafhopper – rice tungro virus

(ii) Mealybug – pineapple mealybug wilt

(iii) Aphid – mosaic virus

(iv) Whitefly – yellow mosaic diseases








NPK fertilizer









The plant turns pale to yellowish green



NPK fertilizer



Leaf turns dark green



NPK fertilizer



Reforestation: This is the process of planting trees in a forest where the number of trees has been decreasing.



Afforestation: This is the planting of new trees to replace the ones that have been cut down. This ensures the continuous availability of trees all the time. Afforestation in other words, is the growing of tree seedlings to make a forest.



Selective exploration: This involves the cutting down of matured trees while allowing the younger ones to reach maturity before they are cut down.



(i)Maple tree

(ii)Flowering dogwood tree

(iii)Tulip tree

(iv)River birch tree.




Soil requirements: It requires loamy, sandy soil, not fine sand that clings together, but larger grains that drain easily.



Land Preparation: It can be done mechanically through ploughing, harrowing and riding.



Method of propagation: Banana is propagated by vegetative means.



Fertilizer requirements: Apply Muriate of potash 25kg/ha by ring method at regular intervals.



(i) Banana aphid.

(ii) Banana flower thrips.



(i) Stem Borer

(ii) Nematode



Harvesting: A bunch of banana is harvested when the fruit is severed from the bunch stalk by using cutlass. At times the pseudo-stem is cut until the tree falls.



(i) Many chicks can be hatched at a time in a short while.

(ii) Another thing is that it is possible to plan when to hatch the chicks unlike with the hen one may not know when it can sit for the eggs.

(iii) Artificial incubation cannot spread parasites and diseases to the chicks and lastly there is no cost for feeding a broody hen since an incubator is used.

(iv) Chances of eggs spoilage are minimized since all eggs are subjected to the optimal hatching temperatures.

(v) There are no chances of the hen damaging eggs through pecking, a common occurrence with natural incubation.



(i) Cuttings

(ii) Layering

(iii) Division

(iv) Budding and grafting.



(i) Phenotype: These are all the observable characteristics of an animal which includes the animal’s appearance, development, and behavior that result from the interaction of its genotype (total genetic inheritance) with the environment.


(ii) Chromosome: This is a structural unit of the nucleus of a cell of an animal which carries the gene in a linear order.


(iii) Hybrid: These are animals produced by the cross-breeding of two genetically different varieties or species of animals.


(iv) Gametes: These are the mature reproductive or sex cell that contains a haploid number of chromosomes.


(v) Filial generation: This is a generation in a breeding experiment that is successive to a mating between parents of two distinctively different but usually relatively pure genotypes.




(i) It helps to reduce or neutralize soil acidity.

(ii) Lime application helps to increase the activities of soil living organism.

(iii) Liming makes nutrients like calcium and phosphorus more readily available for tissue development.

(iv) Lime increases the rate of water percolation in clay soil.

(v) It reduces turbidity in fish ponds through floculation property.




(i) They reduce the growth of host animals.

(ii) High infestation can affect the respiration of host animals.

(iii) It causes indigestion and constipation.

(iv) It results in loss of appetite, weakness and may result in death.

(v) It destroys many of the organs during the migration of the young worms.

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