waec model questions vol1 2021 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 2021 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 field trial was set up to evaluate the effect of inter‑cropping on insect biodiversity in a maize farm. Ten 5 m × 5 m quadrats were sampled and the number of individuals of each insect species recorded as follows: | Species | Number of individuals | |---------|-----------------------| | A | 40 | | B | 25 | | C | 20 | | D | 10 | | E | 5 | Using this data, answer the questions below.
Question Parts
(a)
State the primary objective of this biodiversity assessment.
(b)
Calculate the Shannon‑Wiener diversity index (H') for the sampled community. Use natural logarithms and give your answer to two decimal places.
(c)
If a healthy agro‑ecosystem is considered to have H' ≥ 1.80, suggest two practical management measures that could be adopted to raise the diversity index in this field.
(d)
Identify one abiotic factor that could be limiting insect diversity in the sampled area and propose a method to control or mitigate its effect.
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 moisture experiment was conducted on a loamy field. The following gravimetric water contents were measured using the pressure plate apparatus: - At a matric potential of –10 kPa (field capacity): 30 % (w/w) - At a matric potential of –1500 kPa (wilting point): 12 % (w/w) The bulk density of the soil is 1.4 g cm⁻³. The field area is 1 ha and the effective rooting depth for the crop is 30 cm. Answer the questions below.
Question Parts
(a)
State the definitions of field capacity and wilting point in terms of soil water status.
(b)
Convert the gravimetric water contents at field capacity and wilting point to volumetric water contents (θ_v). Use the bulk density given and assume the density of water is 1 g cm⁻³.
(c)
Determine the available water capacity (AWC) of the soil profile in decimal form and as a percentage.
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 uses a hand hoe that has a wooden handle 1.20 m long and a metal blade whose tip is 0.20 m from the pivot point. When digging, the farmer applies a force of 120 N at the end of the handle and lifts the blade through a vertical distance of 0.30 m each stroke. The farmer makes 20 strokes per minute.
Question Parts
(a)
Calculate the mechanical advantage of the hoe.
(b)
Determine the work done by the blade in one lift.
(c)
Calculate the average power output of the farmer while digging.
(d)
State two safety precautions that should be observed when using the hand hoe.
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 farmer operates a diesel tractor rated at 20 hp to pull a plough. The tractor’s transmission has a gear ratio of 4:1 (engine to drive wheels). Each drive wheel has a radius of 0.50 m and the tractor’s weight is 2 000 kg. The coefficient of rolling resistance between the wheels and the soil is 0.03. While pulling, the tractor moves at a constant speed of 3 km h⁻¹. The engine’s specific fuel consumption is 0.25 L kW⁻¹ h⁻¹.
Question Parts
(a)
Calculate the tractive force that can be developed at the wheels, ignoring losses.
(b)
Determine the maximum draw‑bar pull the tractor can exert, taking rolling resistance into account.
(c)
Calculate the tractor’s fuel consumption per hour.
(d)
Suggest two maintenance practices that can improve the tractor’s operational 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