waec model questions vol1 2025 agricultural_science | Practical

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Question 1
A farmer conducts an experiment to assess the effects of different fertilizers on the growth of maize plants. He sets up three plots of land, each measuring 10 meters by 5 meters. He applies three different types of fertilizers (A, B, and C) to each plot. After four weeks, he measures the height of the maize plants in each plot. The heights recorded are as follows: Plot A: 150 cm, Plot B: 120 cm, Plot C: 130 cm. Using this data, answer the following questions.
Question Parts
(a)
Calculate the average height of the maize plants in the three plots.
(b)
If the farmer decides to increase the height of the maize plants by applying an additional 10% of fertilizer A to Plot A, what will be the new height of the maize plants in Plot A?
(c)
Discuss two possible environmental impacts of using chemical fertilizers in agriculture.
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Question 2
A soil scientist conducts a pH test on soil samples collected from different depths: 0-15 cm, 15-30 cm, and 30-45 cm. The pH values obtained are 6.5, 5.8, and 7.0 respectively. Using this data, answer the following questions.
Question Parts
(a)
Calculate the average pH of the soil samples.
(b)
Explain the significance of soil pH in agricultural practices.
(c)
If the ideal pH for growing maize is between 6.0 and 6.8, determine whether the soil at each depth is suitable for maize cultivation.
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Question 3
A farmer is preparing a rectangular farm plot for planting. The length of the plot is 120 meters and the width is 80 meters. The farmer intends to use a specific type of fertilizer that covers 15 square meters per kilogram. (a) Calculate the total area of the plot in square meters. (b) Determine the amount of fertilizer needed in kilograms to cover the entire plot. (c) If the cost of the fertilizer is ₦200 per kilogram, calculate the total cost of the fertilizer required for the plot.
Question Parts
(a)
Calculate the total area of the plot in square meters.
(b)
Determine the amount of fertilizer needed in kilograms to cover the entire plot.
(c)
If the cost of the fertilizer is ₦200 per kilogram, calculate the total cost of the fertilizer required for the plot.
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Question 4
A farmer is using a tractor to plow a field that measures 150 meters in length and 100 meters in width. The tractor can cover 1 hectare (10,000 square meters) in one hour. (a) Calculate the area of the field in hectares. (b) If the tractor operates at a speed of 5 meters per minute, estimate the time it will take to plow the entire field in hours. (c) Discuss two factors that could affect the efficiency of the tractor during plowing.
Question Parts
(a)
Calculate the area of the field in hectares.
(b)
If the tractor operates at a speed of 5 meters per minute, estimate the time it will take to plow the entire field in hours.
(c)
Discuss two factors that could affect the efficiency of the tractor during plowing.
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