WAEC Agricultural Science Past Questions & Answers - Page 3

Examples of crops which require the illustrated farm operation are rice, groundnut and millet.

Winnowing is the process of separating the lighter chaff or husk from the heavier grains or seeds after threshing. It is usually done by tossing the mixture of grains and chaff into the air with a winnowing basket or using a winnowing machine. The wind carries away the lighter chaff, allowing the heavier grains to fall back to the ground or into a container.

When a controlled fire burns through a grassland, it can remove accumulated dead plant material and woody debris, known as thatch. Thatch can hinder the growth of new grass shoots and prevent sunlight and rainwater from reaching the soil surface. By removing the thatch through controlled burning, the fire creates a favorable environment for grass regeneration.

1 hectare = 10,000 square meters

Area of the farmland = 100 m x 500 m = 50,000 square meters

Now, we can convert the area to hectares:

Area in hectares = 50,000 square meters / 10,000 square meters/hectare = 5 hectares

Next, we can calculate the quantity of cowpea seeds required using the given seed rate:

Seed rate = 25 kg/hectare

Quantity of cowpea seeds required = Seed rate x Area

Quantity of cowpea seeds required = 25 kg/hectare x 5 hectares

Quantity of cowpea seeds required = 125 kg

Therefore, the quantity of cowpea seeds required to cultivate the farmland is 125 kg. The correct answer is "125 kg."

Maceration is a process used in the processing of oil palm. It involves the softening or breaking down of the oil palm fruits by soaking them in water or another liquid. This process helps to separate the oil from the fruit and makes it easier to extract the oil.