neco 2019 agricultural_science | Practical

Prepare for your exams with neco questions? Reviewing past/model questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 agricultural_science (Practical) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1 View Details
A student carried out a biodiversity survey of a 1 ha mixed‑cropping field. Using a 1 m² quadrat, the numbers of individuals of each plant species observed in the field are recorded in the table below. | Species | Number of individuals | |---------|-----------------------| | A | 30 | | B | 20 | | C | 15 | | D | 10 | | E | 5 | Using the data provided, answer the following questions.
Question Parts
(a)
State the total number of different plant species recorded in the field.
(b)
Calculate the Shannon‑Wiener diversity index (H') for the field. Give your answer to two decimal places.
(c)
Classify the field’s biodiversity as low, moderate or high using the following criteria: H' < 1 = low, 1 ≤ H' ≤ 1.5 = moderate, H' > 1.5 = high. Justify your classification.
Detailed Essay Solution & Marking Scheme Available

Get the step-by-step mathematical proofs, key points required by examiners, and a comprehensive breakdown from our AI Tutor.

Reveal Answer
Question 2 View Details
A soil core was taken from a field to determine bulk density and field capacity. The core has an internal diameter of 5.0 cm and a height of 10.0 cm. Measurements obtained: - Fresh weight of the core (soil + water) = 420 g - Oven‑dry weight of the soil after removing the core = 350 g - Weight of the core after saturation and drainage (soil + retained water) = 380 g Using the data above, answer the following questions.
Question Parts
(a)
Calculate the bulk density of the soil in g cm⁻³. Give your answer to two decimal places.
(b)
Determine the gravimetric water content at field capacity as a percentage.
(c)
Convert the gravimetric water content obtained in (b) to volumetric water content (%) using the bulk density calculated in (a).
(d)
Mention two practical sources of error that could affect the accuracy of the bulk density determination and briefly explain how they influence the result.
Detailed Essay Solution & Marking Scheme Available

Get the step-by-step mathematical proofs, key points required by examiners, and a comprehensive breakdown from our AI Tutor.

Reveal Answer
Question 3 View Details
A farmer is using a hand hoe to loosen soil in a garden bed. The hoe consists of a metal blade attached to a wooden handle that pivots at the blade. The farmer sets up a simple lever experiment as follows: the pivot (blade) is fixed, the distance from the pivot to the point where the effort is applied on the handle is measured as 0.80 m, and the distance from the pivot to the centre of the blade (load arm) is 0.20 m. Using a spring‑balance, the farmer records an effort force of 30 N required to lift the blade vertically. The blade is then lifted through a vertical distance of 0.50 m. Answer the following:
Question Parts
(a)
State the three main parts of the hand hoe and give one function of each part.
(b)
Calculate the mechanical advantage (MA) of the hoe as a lever and determine the weight of the blade (in newtons) that is being lifted.
(c)
Using the weight found in (b), compute the work done in lifting the blade through the 0.50 m vertical distance. Express your answer in joules (J).
(d)
List two possible sources of error in this experiment and suggest one practical way to minimise each error.
Detailed Essay Solution & Marking Scheme Available

Get the step-by-step mathematical proofs, key points required by examiners, and a comprehensive breakdown from our AI Tutor.

Reveal Answer
Question 4 View Details
A small diesel tractor is being tested for its field performance. The tractor has a rated engine power of 20 kW at 2000 rpm. During a field trial the following data are recorded: - Fuel consumed: 4.0 L over a continuous 2‑hour operation. - Draft force measured on a 2‑bottom plough: 3000 N. - The tractor travels a straight 2 km stretch at a constant speed while the draft is recorded. - Width of the plough (effective working width): 2.5 m. - Observed field efficiency (accounting for turns and overlap): 80 %. Using the data above, answer the following questions:
Question Parts
(a)
Calculate the total work (in kilojoules) done by the tractor in pulling the plough over the 2 km distance.
(b)
Determine the average draw‑bar power (in kilowatts) delivered by the tractor during the test.
(c)
Assuming the calorific value of diesel is 9.8 kWh L⁻¹, calculate the overall draw‑bar efficiency of the tractor (percentage).
(d)
Compute the field capacity of the tractor (in hectares per hour) using the given plough width, speed and field efficiency.
Detailed Essay Solution & Marking Scheme Available

Get the step-by-step mathematical proofs, key points required by examiners, and a comprehensive breakdown from our AI Tutor.

Reveal Answer

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub:
Chat with Support