2021 JAMB Agricultural Science Past Questions & Answers

Question 1

Layer's ration contains more limestone than grower's ration because limestone

Accepted Answer

D. supplies sufficient minerals to layers for shell formation

Answer

A. is difficult for the growers to digest

Answer

B. stimulates layer's appetite

Answer

C. reduces the acidity in the gut if growers

Question 2

The primary role of agriculture is the provision of

Accepted Answer

C. food for man and his animals

Answer

A. foreign exchange earnings

Answer

B. raw materials for industries

Answer

D. employment and income for farmers

Question 3

Food shortage can be minimized by

Accepted Answer

A. efficient pest control services

Answer

B. natural hazards

Answer

C. illegal exportation of farm produce

Answer

D. hoarding

Question 4

The study of insect pests of crops is called

Accepted Answer

A. entomology

Answer

B. pathology

Answer

C. agronomy

Answer

D. synecology

Question 5

What is the full meaning of IITA?

Accepted Answer

A. International Institute of Tropical Agriculture

Answer

B. International Institution of Tropical Agriculture

Answer

C. Institute of Investment and Trade Agriculture

Answer

D. Interlude Institute of Tropical Agriculture

Question 6

Which of the following farm practices is not mechanized?

Accepted Answer

D. transplanting

Answer

A. planting

Answer

B. fertilizer application

Answer

C. bush clearing

Question 7

A periodic maintenance activity carried out using a farm tractor is

Accepted Answer

D. changing of engine oil

Answer

A. checking of radiator water

Answer

B. checking of tire pressure

Answer

C. cleaning after use

Question 8

Which of the following is not a problem of forest management?

Accepted Answer

C. planting different varieties of timber

Answer

A. absence of adequate information on the ecosystem

Answer

B. inadequate support from government for the development of forest resources

Answer

D. indiscriminate destruction of forest resources by bush fire

Question 9

The easiest method of determining soil texture in the field is by

Accepted Answer

D. feeling

Answer

A. moulding

Answer

B. sieving

Answer

C. sedimenting

Question 10

If 200 layers will consume 25kg of feed per day. Calculate the amount of feed consumed by a layer per day.

Accepted Answer

D. 0.125kg/day

Answer

A. 0.25kg/day

Answer

B. 0.2kg/day

Answer

C. 0.5kg/day

Question 11

The practice of mating closely related animals is called

Accepted Answer

D. inbreeding

Answer

A. pen mating

Answer

B. cross breeding

Answer

C. outbreeding

Question 12

The alternate heating and cooling of rocks result in

Accepted Answer

D. fragmentation

Answer

A. sublimation

Answer

B. volatilization

Answer

C. solidification

Question 13

Subsistence agriculture is characterized by

Accepted Answer

C. small farm holdings

Answer

A. used of machines

Answer

B. large scale production

Answer

D. intensive use of inputs

Question 14

The main processes involved in the marketing of cotton include the following except

Accepted Answer

A. wedding

Answer

B. processing

Answer

C. grading

Answer

D. packaging

Question 15

Which of the following constitutes subsidy in agricultural enterprise?

Accepted Answer

A. supply of fertilizers to farmers at reduced price

Answer

B. borrowing of money from a thrift society

Answer

C. provision of money to farmers through commercial banks

Answer

D. provision of services through cooperative societies

Question 16

What is the percentage water content of soil sample which weighed 180g when fresh and 120g when oven-dried?

Accepted Answer

C. 33.33%

Answer

A. 20.14%

Answer

B. 25.00%

Answer

D. 60.00%

Question 17

Farm surveying equipment include the following except

Accepted Answer

C. Spade

Answer

A. Abney level

Answer

B. Compass

Answer

D. Gunter's chain

Question 18

The following are necessary operations in maize cultivation except?

Accepted Answer

C. nursery practices

Answer

A. weeding

Answer

B. thinning

Answer

D. fertilizer application

Question 19

Which of the following is not correct about Stylosanthers gracilis?

Accepted Answer

A. It is an animal legume

Answer

B. It is propagated by seeds

Answer

C. It is drought resistant

Answer

D. It produces nodules

Question 20

Gestation period is defined as the time

Accepted Answer

B. between conception and parturition

Answer

A. of fusion of the sperm and the egg

Answer

C. of release of ovum from the ovary

Answer

D. of the birth of the young animal

Question 21

The main source of power for subsistence agriculture is

Accepted Answer

D. man

Answer

A. animal

Answer

B. machine

Answer

C. electricity

Question 22

If urea fertilizer contains 46% nitrogen, calculate the amount of nitrogen in 25kg bag of fertilizer?

Accepted Answer

A. 11.5kg

Answer

B. 13.5kg

Answer

C. 21.5kg

Answer

D. 26.5kg

Question 23

Which of the weeds is dispersed by wind?

Accepted Answer

D. Tridax (Tridax procumbeus)

Answer

A. pig weed (Boerhavia diffusa)

Answer

B. goat weed (Ageratum conizoides)

Answer

C. Hause thorns (Acanthospermum hispidum)

Question 24

The characteristic symptoms of mosaic disease of crops is usually observed on

Accepted Answer

B. leaves

Answer

A. roots

Answer

C. stems

Answer

D. fruits

Question 25

In subsistence agriculture

Accepted Answer

B. surplus produce is small

Answer

A. yields are usually high

Answer

C. savings are made

Answer

D. farm sizes are large

Question 26

Rocks formed by the cooling and solidification of molten rocks called magma ejected from beneath the earth's crust is

Accepted Answer

A. Igneous rock

Answer

B. Metamorphic rock

Answer

C. Caleima rock

Answer

D. Sedimentary rock

Question 27

Ginning is a method of processing

Accepted Answer

B. cotton

Answer

A. cocoa

Answer

C. oil palm

Answer

D. palm kernel oil

Question 28

Financial assistance from government to the farmers is usually in the following forms except

Accepted Answer

B. tax

Answer

A. loan

Answer

C. credit

Answer

D. susidy

Question 29

An increase in supply of agricultural produce can be caused by the following factors except

Accepted Answer

D. consumers buying less products

Answer

A. reduced cost of production

Answer

B. favourable weather conditions

Answer

C. reduced taxation

Question 30

Which of the following is not an example of edaphic factors?

Accepted Answer

D. storm

Answer

A. rocks

Answer

B. soil

Answer

C. topography

Question 31

Which of the following is the correct order for land preparation?

Accepted Answer

A. land clearing → ploughing → harrowing → ridging

Answer

B. land clearing → harrowing → ploughing → ridging

Answer

C. land clearing → ploughing → ridging → harrowing

Answer

D. land clearing → harrowing → ridging → ploughing

Question 32

Callosobruchus maculates is a common pest of

Accepted Answer

B. cowpea

Answer

A. maize

Answer

C. rice

Answer

D. millet

Question 33

The correct sequence in the processes of crop improvement is

Accepted Answer

A. Introduction → selection → breeding

Answer

B. Breeding → selection → introduction

Answer

C. Breeding → introduction → selection

Answer

D. Introduction → breeding → selection

Question 34

The adult male cattle is called

Accepted Answer

A. bull

Answer

B. ram

Answer

C. boar

Answer

D. duck

Question 35

The effects of practicing crop rotation include the following except

Accepted Answer

C. adding humus to the soil

Answer

A. maintaining and improving soil fertility

Answer

B. controlling soil erosion

Answer

D. preventing the build-up of pests and diseases

Question 36

Which of the following factors influence agricultural production is biotic factor?

Accepted Answer

A. parasite

Answer

B. soil PH

Answer

C. topography

Answer

D. soil texture

Question 37

Which of the following is a friend of farmer

Accepted Answer

A. earthworm

Answer

B. aphid

Answer

C. grasshopper

Answer

D. termite

Question 38

A farmer bought a farm implement for ₦12,500 in 2007. At the end of the fourth year, he sold it for ₦4,300. The annual depreciation of the implement is

Accepted Answer

C. ₦2,050

Answer

A. ₦4,300

Answer

B. ₦3,125

Answer

D. ₦1,075

Question 39

The natural resource utilized for production is

Accepted Answer

D. land

Answer

A. capital

Answer

B. management

Answer

C. labour

Question 40

If 100 pieces of pests is attacking an hectare of cocoa farm and 25% suddenly died while 40% of the remnant is sent for medical examination. What is the number of pest remaining?

Accepted Answer

A. 45

Answer

B. 50

Answer

C. 25

Answer

D. 75

Question 41

Miracidium is one of the stages in the life cycle of

Accepted Answer

B. liver fluke

Answer

A. roundworm

Answer

C. tapeworm

Answer

D. tick

Question 42

The main objectives of agriculture is

Accepted Answer

C. food production

Answer

A. income generation

Answer

B. provision of employment

Answer

D. provision of shelter

Question 43

The practice of bee farming is called

Accepted Answer

A. Apiculture

Answer

B. Heliculture

Answer

C. Forestry

Answer

D. Agronomy

Question 44

The following processes in crops are sensitive to daylength except

Accepted Answer

D. branching

Answer

A. fruiting

Answer

B. growth

Answer

C. flowering

Question 45

A condition in which a gene does not manifest observable characteristics in the presence of its dominant allele is known as

Accepted Answer

C. recessiveness

Answer

A. dominance

Answer

B. mutation

Answer

D. homozygosity

Question 46

An advantage of extensive system of rearing goats is

Accepted Answer

A. low labour requirement

Answer

B. easy control of disease

Answer

C. indiscriminate mating

Answer

D. exposure to adverse weather conditions

Question 47

Which of the following surveying equipment is used for measuring angles during farm surveying?

Accepted Answer

A. Theodolite

Answer

B. Measuring tape

Answer

C. Gunter's chain

Answer

D. Abney level

Question 48

Heavy infestation of liver fluke causes poor absorption of fats in livestock by

Accepted Answer

A. blocking bile ducts thus preventing flow of bile

Answer

B. destroying fat-digesting enzymes

Answer

C. reducing ingestion of fats

Answer

D. inhibiting the action of digestive enzymes

Question 49

Which of the following is not a method of improving rangeland?

Accepted Answer

A. practicing continuous grazing

Answer

B. routine and regular weeding

Answer

C. routine reseeding

Answer

D. regular application of fertilizers

Question 50

Which of the following sources of farm power is most versatile in West Africa?

Accepted Answer

B. animal

Answer

A. Biogas

Answer

C. wind

Answer

D. water

Question 51

Methods of preserving fish include the following except

Accepted Answer

A. boiling

Answer

B. drying

Answer

C. smoking

Answer

D. salting

Question 52

Fertile soil is one which

Accepted Answer

D. contain all essential plant nutrients in suitable proportion

Answer

A. which easily drained

Answer

B. is well aerated

Answer

C. can produce a good harvest of cowpea

Question 53

Which of the following fishing gears can be used for total harvesting of pond?

Accepted Answer

D. dragnet

Answer

A. hook and line

Answer

B. harpoon

Answer

C. basket trap

Question 54

The hormone responsible for milk let down in female farm animals is

Accepted Answer

C. Oxytosin

Answer

A. testosterone

Answer

B. FSH

Answer

D. androgen

Question 55

Which of the following is not a symptom of foot and mouth disease of cattle?

Accepted Answer

D. blood stained diarrhea

Answer

A. excessive production of saliva

Answer

B. sores on feet and tongue

Answer

C. lameness

Question 56

Calculate the salvage value of a tractor with a depreciation value of ₦10,580.00 and initial cost of ₦50,000 after a year of use

Accepted Answer

C. ₦39,420

Answer

A. ₦10,580

Answer

B. ₦30,290

Answer

D. ₦60,580

Question 57

The main aim of mechanized agriculture is

Accepted Answer

D. reducing cost of production

Answer

A. reducing maturation time for crops

Answer

B. decreasing number of pests

Answer

C. having a large land area for cultivation

Question 58

Which of the following groups of animals is usually kept in game reserves?

Accepted Answer

D. lions, elephants and donkeys

Answer

A. cattle, sheep and goats

Answer

B. camels, donkeys and horses

Answer

C. chicken, duck and turkeys

Question 59

Ginger is propagated by

Accepted Answer

B. rhizomes

Answer

A. suckers

Answer

C. seeds

Answer

D. tuber

Question 60

The average weather condition of a place, measured over a long period of time is called

Accepted Answer

A. climate

Answer

B. wind

Answer

C. rainfall

Answer

D. temperature

Question 61

Which of the following agricultural extensions aims at reaching a large number of farmers at the same time?

Accepted Answer

A. mass method

Answer

B. group method

Answer

C. individual method

Answer

D. contact method

Question 62

The most suitable source of power for stationary equipment on the farm is

Accepted Answer

B. electricity

Answer

A. machinery

Answer

C. animal

Answer

D. man

Question 63

The system in which a farmer uses a piece of land for a period and abandons it for another land is called

Accepted Answer

C. shifting cultivation

Answer

A. crop rotation

Answer

B. mix cropping

Answer

D. leg farming

Question 64

The source of food for fishes in the river is called

Accepted Answer

B. planktons

Answer

A. rotten leaves

Answer

C. micro-organism

Answer

D. algae

2021 JAMB Agricultural Science Past Questions and Answers

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2021 JAMB Agricultural Science Past Questions and Answers

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