2015 JAMB Agricultural Science Past Questions & Answers

Question 1

Which of the following properties of soil determines its water-holding capacity? I. Texture II. pH III. Colour IV. Structure

Accepted Answer

B. I and IV only

Answer

A. I and II only

Answer

C. II and III only

Answer

D. III and IV only

Question 2

Which of the following statements about soil organisms is false?

Accepted Answer

C. Soil with good texture and structure cannot harbour soil microbes

Answer

A. Soil pH will affect the population of soil organisms

Answer

B. Population of soil living organisms is increased with increase in soil organic matter

Answer

D. Soil temperature affects the activities of soil organisms.

Question 3

If T represents the gene for tallness while t represents dwarfness The genotypic ratio of the second filial generation will be

Accepted Answer

B. 1 : 2 : 1

Answer

A. 3 : 1

Answer

C. 2 : 2

Answer

D. 4 : 0

Question 4

The correct sequence of feed utilization in farm animals is

Accepted Answer

C. ingestion-digestion-absorption-assimilation

Answer

A. digestion-ingestion-absorption-assimilation

Answer

B. ingestion-digestion-assimilation-absorption

Answer

D. digestion-assimilation-ingestion-absorption

Question 5

Which of the following groups of rocks is formed as a result of volcanic eruption?

Accepted Answer

B. Basalt, granite and pumice

Answer

A. Limestone, basalt and shale

Answer

C. Sandstone, granite and quartzite

Answer

D. Marble, gneiss and shale.

Question 6

If the recommended spacing for a tree crop is 2.5cm by 4.0m determine the number of seedlings required to plant a 2-hectare farmland.

Accepted Answer

B. 2,000

Answer

A. 1,000

Answer

C. 10,000

Answer

D. 20,000

Question 7

The data for feed consumption and weighing gain of four farm animals labelled P, Q, R and S are shown below. P -50kg feed consumed and 20kg weight gained Q -90kg feed consumed and 30kg weight gained R -100kg feed consumed and 25kg weight gained S - 150kg feed consumed and 30kg weight gained. Which of the following must efficient feed converter?

A.P
B.Q
C.R
D.S

Show answer

Answer: A. P

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Accepted Answer

D. 0.2

Answer

A. 0.4

Answer

B. 0.33

Answer

C. 0.25

Question 8

Which of the following factors does not influence the distribution of cattle in West Africa?

Accepted Answer

B. Light

Answer

A. Pastures

Answer

C. Diseases

Answer

D. Rainfall

Question 9

A regulatory control of diseases in crop production is

Accepted Answer

B. quarantine

Answer

A. roughing

Answer

C. crop rotation

Answer

D. Soil tillage.

Question 10

Which of the following factors are causes of deforestation in West Africa? I. Expansion of cultivated land II. High population growth rate III. Conservation of wildlife in game reserves IV. Urban growth

Accepted Answer

C. I, II and IV only

Answer

A. I, II and III only

Answer

B. II, III and IV only

Answer

D. I, II, III and IV.

Question 11

The following are advantages of sub-surface irrigation except that

Accepted Answer

B. it can be used only for specific types of crops

Answer

A. it is suitable for soils with low water holding capacity

Answer

C. the rate of evaporation is greatly reduced

Answer

D. it reduces the incidence of pests

Question 12

The device which helps to stabilize heat in an incubator is the

Accepted Answer

D. thermostat

Answer

A. thermometer

Answer

B. hygrometer

Answer

C. barometer

Question 13

Which of the following diseases commonly occurs during brooding? I. Yolk sac infection II. Coccidiosis III. Fowl pox IV. Pullorum

Accepted Answer

B. I, II and IV only

Answer

A. I, II and III only

Answer

C. I, III and IV only

Answer

D. I, II and IV.

Question 14

Which of the following insects transmits swollen shoot disease of cocoa?

Accepted Answer

B. Mealybug

Answer

A. steam borer

Answer

C. white fly

Answer

D. scale insect

Question 15

Piglet anaemia can be controlled by using

Accepted Answer

B. iron drugs

Answer

A. sulphur drugs

Answer

C. anthelmintics

Answer

D. antibiotics

Question 16

The process of grafting in crop production involves

Accepted Answer

D. The joining of two parts from related crops.

Answer

A. The fusion of gametes of two crops

Answer

B. Inducing rooting from stems

Answer

C. The transfer of a bud from one crop to another

Question 17

The following crops will enrich the soil with nitrates except

Accepted Answer

D. Axonopus

Answer

A. Calopogonium

Answer

B. pueraria

Answer

C. centrosema

Question 18

In which layer of the soil profile do most biological activities occur?

Accepted Answer

D. A-horizon

Answer

A. D-horizon

Answer

B. C-horizon

Answer

C. B-horizon

Question 19

Corns, rhizomes and tubers are examples of

Accepted Answer

A. underground stems

Answer

B. underground roots

Answer

C. modified leaves

Answer

D. aerial stems

Question 20

Close to the time of harvesting of cotton, sunshine is needed to ensure the production of bolls that are

Accepted Answer

C. not mouldy

Answer

A. big

Answer

B. Bright

Answer

D. not open

Question 21

Soil water that is available for root absorption at field capacity is

Accepted Answer

A. Capillary water

Answer

B. hygroscopic water

Answer

C. Gravitational water

Answer

D. superfluous water.

Question 22

Government plays roles in the development of agriculture through the following means except

Accepted Answer

B. training of farmer's children

Answer

A. Provision of subsidies

Answer

C. establishment of agricultural development programmes

Answer

D. establishment of farm settlements

Question 23

Yellow colouration of the lower leaves of a growing maize plant may be due to deficiency in

Accepted Answer

D. nitrogen

Answer

A. potassium

Answer

B. phosphorus

Answer

C. zinc

Question 24

Under the communal land tenure system, farmers find it difficult to secure loans because

Accepted Answer

C. land holdings cannot be used as security

Answer

A. land holdings are small and fragmented

Answer

B. they are poor

Answer

D. they are mostly illiterate.

Question 25

Which of the following statements is a disadvantage of human power? It

Accepted Answer

D. has low output.

Answer

A. controls other sources of farm power

Answer

B. brings about least damage

Answer

C. is easily available and controlled

Question 26

Tomatoes are staked in order to

Accepted Answer

D. prevents rotting of fruits

Answer

A. accelerate their growth

Answer

B. induce flowering

Answer

C. accelerate fruit ripening

Question 27

The weight of a sheep increased from 25kg to 45kg in two months. If the total consumption during the period was 60kg. Determine the feed conversion ratio

Accepted Answer

C. 3 : 1

Answer

A. 1 : 1

Answer

B. 1 : 2

Answer

D. 4 : 1

Question 28

The forest management system which involves the planting of both food crops and forest trees on the same piece of land at the same time is known as

Accepted Answer

B. Taungya

Answer

A. Selective exploitation

Answer

C. Slips

Answer

D. cuttings

Question 29

In animal production, newly-born rabbits are called

Accepted Answer

A. Bunnies

Answer

B. Kids

Answer

C. Pouts

Answer

D. Lambs

Question 30

The data for feed consumption and weighing gain of four farm animals labelled P, Q, R and S are shown below. P -50kg feed consumed and 20kg weight gained Q -90kg feed consumed and 30kg weight gained R -100kg feed consumed and 25kg weight gained S - 150kg feed consumed and 30kg weight gained. Which of the following must efficient feed converter?

A.P
B.Q
C.R
D.S

Show answer

Answer: A. P

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Accepted Answer

A. P

Answer

B. Q

Answer

C. R

Answer

D. S

Question 31

Poaching is prohibited in game reserves to

Accepted Answer

B. conserve wildlife

Answer

A. reduce wildlife population

Answer

C. starve hunters

Answer

D. protect hunters from wild animals.

Question 32

Pineapple is widely propagated using

Accepted Answer

B. suckets

Answer

A. seeds

Answer

C. Slips

Answer

D. cuttings

Question 33

In crop production, ginger is propagated by

Accepted Answer

C. rhizome

Answer

A. seeds

Answer

B. bulbs

Answer

D. corn

Question 34

The use of animal traction is limited in the forest zones of West Africa because of the

Accepted Answer

B. presence of tsetse flies

Answer

A. Topography of the forest land

Answer

C. High amount of rainfall

Answer

D. culture of the people

Question 35

The correct sequence for the use of coupled implements for land preparation is

Accepted Answer

A. Plough, harrow and ridger

Answer

B. harrow, ridger and plough

Answer

C. plough, ridger and harrow.

Answer

D. ridger, harrow and plough

Question 36

Agriculture contributes to the economy of West African countries through the following means except

Accepted Answer

B. Supply of armament for territorial defence

Answer

A. Reduction of poverty through job creation

Answer

C. Provision of foreign exchange

Answer

D. supply of raw materials to industries

Question 37

If T represents the gene for tallness while t represents dwarfness When a tall (TT) crop is crossed with a dwarf (tt) crop, the resultant crops will be

Accepted Answer

B. 100% tall

Answer

A. 100% dwarf

Answer

C. 50% tall and 50% dwarf

Answer

D. 75% tall and 25% dwarf.

Question 38

Crop rotation decreases the incidence of pests by

Accepted Answer

A. breaking life cycles of pests

Answer

B. attracting pest predators

Answer

C. Sterilizing the soil

Answer

D. maintaining soil fertility.

Question 39

Limitations of farm mechanization in West Africa do not include

Accepted Answer

C. availability of spare parts

Answer

A. land fragmentation

Answer

B. high capital investment

Answer

D. Purchase of machines

Question 40

A detrimental effect of bush burning is that it

Accepted Answer

A. destroys soil organic matter

Answer

B. Destroys weed seeds

Answer

C. sterilizes the soil

Answer

D. adds potash to the soil

Question 41

In preparing for parturition of a sow, warmth should be provided to

Accepted Answer

D. prevent chilling of the young.

Answer

A. Promote growth of hair of the young

Answer

B. make the young suckle colostrum's

Answer

C. prevent anaemia in the young

Question 42

Which of the following statements is correct about micro-nutrients? They

Accepted Answer

B. are required by plants in very small quantities

Answer

A. Promote formation of only root nodules

Answer

C. are fixed into the soil through microbial activity

Answer

D. increase crop tolerance to pest attack.

Question 43

Sexual maturity in farm animals is not influenced by their

Accepted Answer

D. wearing age

Answer

A. Breed

Answer

B. Sex

Answer

C. nutrition

Question 44

Which of the following crops has a fibrous root system?

Accepted Answer

D. sugarcane

Answer

A. cotton

Answer

B. coffee

Answer

C. cowpea

Question 45

A sow that is not producing milk after farrowing should be given

Accepted Answer

A. oxytocin

Answer

B. antibiotic

Answer

C. anthelmintic drug

Answer

D. sulphaquinoxaline.

Question 46

Which of the following statements about agricultural development are true? It leads to I. increased processing of produce II. Increased food production. III. High productivity. IV. Increased agricultural labour force.

Accepted Answer

A. I, II and III only

Answer

B. I, II and IV only

Answer

C. I, III and IV only

Answer

D. II, II and IV only

Question 47

The main objective of establishing forest in the arid region is to

Accepted Answer

A. check desert encroachment

Answer

B. provide firewood for cooking

Answer

C. provide bush-meat

Answer

D. improve the beauty of the environment.

Question 48

The instrument which enables a surveyor to find the direction of a base line is

Accepted Answer

D. magnetic compass

Answer

A. Abney level

Answer

B. ranging pole

Answer

C. plumb bob

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