waec model questions vol1 2022 agricultural_science | Practical

Prepare for your exams with waec model questions vol1 questions? Reviewing past/model questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 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 mixed‑crop field is being surveyed for insect pest diversity. Five 1 m² quadrats are randomly placed and the number of individuals of three pest species (A, B and C) recorded as follows: | Quadrat | Species A | Species B | Species C | |---------|-----------|-----------|-----------| | 1 | 12 | 5 | 3 | | 2 | 8 | 7 | 5 | | 3 | 10 | 4 | 6 | | 4 | 9 | 6 | 5 | | 5 | 11 | 5 | 4 | Using the data, answer the questions below.
Question Parts
(a)
Calculate the relative abundance (proportion) of each species in the whole field.
(b)
Compute Simpson’s Diversity Index (D = 1 – Σ (n_i/N)²) for the field and comment on the level of diversity.
(c)
Suggest two cultural control measures that could be adopted based on the observed diversity.
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 sample is analysed for organic carbon using the Walkley‑Black dichromate oxidation method. The procedure is as follows: 1. 5.0 g of air‑dry soil is digested with excess 0.5 N potassium dichromate in the presence of sulphuric acid. 2. After digestion, the excess dichromate is titrated with 0.5 N ferrous sulphate solution. 3. A blank titration (no soil) is also performed. The titration readings obtained are: - Blank titration (B): 10.0 mL of 0.5 N FeSO₄. - Sample titration (S): 6.2 mL of 0.5 N FeSO₄. Using the Walkley‑Black formula, determine: (a) % organic carbon in the soil sample. (b) % organic matter (assume %OM = %C × 1.724). (c) Identify one probable source of error in the procedure and suggest a precaution to minimise it.
Question Parts
(a)
Calculate the percentage of organic carbon (% C) in the soil sample.
(b)
Convert the % C obtained to % organic matter (% OM).
(c)
State one likely source of error in the Walkley‑Black method and propose a precaution to reduce it.
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 student was asked to evaluate the performance of a hand hoe for preparing a garden bed. The garden bed is a rectangular plot measuring 30 m in length and 20 m in width. The student used the hand hoe to make forward strokes across the plot. Each forward stroke covers a horizontal distance of 0.5 m, the blade width is 0.10 m and the soil is penetrated to a depth of 0.15 m. The student recorded that each stroke takes 2 seconds to complete.
Question Parts
(a)
State three main parts of a hand hoe and briefly describe the function of each part.
(b)
Using the data given, calculate: (i) The total volume of soil displaced during the tillage of the whole plot. (ii) The average rate of soil displacement in cubic metres per minute.
(c)
Identify two possible sources of error that could affect the calculated labour productivity and suggest one practical method 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‑powered tractor (rated engine power 25 kW) was tested for field performance on a rectangular farm plot that is 100 m long and 50 m wide (area = 0.5 ha). The tractor was fitted with a two‑row plough whose effective working width is 2 m. During the test the tractor covered the whole plot in 45 minutes. The average draft (pulling) force recorded by a dynamometer attached to the drawbar was 12 kN. The tractor’s fuel consumption at full load is 5 L h⁻¹. Using the information given, answer the following:
Question Parts
(a)
Calculate the actual power (in kW) required to pull the plough. Show all steps.
(b)
Compare the actual power obtained in (a) with the tractor’s rated engine power and comment on the utilisation factor of the engine.
(c)
Determine the fuel efficiency expressed as hectares per litre of diesel used during the test.
(d)
Suggest two maintenance practices that could improve the tractor’s fuel efficiency and briefly explain how each practice contributes to the improvement.
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