JAMB Agricultural Science Past Questions & Answers - Page 28

136.

Which of these operations comes first in cultural practice?

A.

Tillage

B.

Ridges

C.

Stumping

D.

Harvesting

Correct answer is C

Stumping is the removal of stumps by digging them out manually using cutlasses and axes. It can also be done mechanically by using bulldozer. Stumps are the left over cut trees on the farm left on the soil surface.

137.

Which of the following is not an organic manure?

A.

Green manure

B.

Farmyard manure

C.

Compost

D.

Fertilizer

Correct answer is D

Fertilizers are chemical substances which are usually prepared in the farm, they are made in form of liquid, powder, granules, pellets or crystals

 

138.

One of the limitation of mechanization of farms is

A.

Reduction in the cost of production

B.

Exposure of soil to the effects of climate

C.

Increase in yield of crops

D.

Reduction of farm labour

Correct answer is A

Mechanization is the use of machinery to replace human or animal labour, especially in agriculture .This required lot of capital thereby increasing the cost of production.

139.

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

A.

₦10,580

B.

₦30,290

C.

₦39,420

D.

₦60,580

Correct answer is C

Salvage value is the estimated book value of an asset after depreciation is calculated.

Salvage value + Depreciation value = Cost price

Salvage value + 10,580 = 50,000

∴ Salvage value = 50,000 - 10,580

⇒ ₦39,420

140.

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

A.

0.25kg/day

B.

0.2kg/day

C.

0.5kg/day

D.

0.125kg/day

Correct answer is D

200 layers → 25kg/day
1 layer → x
∴  \(\frac{200}{1}\) = \(\frac{25}{x}\)

200x = 25

x = \(\frac{25}{200}\) = \(\frac{1}{8}\) = 0.125 kg/day