Waec Model Questions Vol1 2020 Agricultural Science Question 39
Practice objective / multiple choice question 39 from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
A 5‑ha field is infested with stem borer. The recommended pesticide dosage is 2.5 L ha⁻¹ of a 0.8 % active‑ingredient (AI) solution. Each litre of this solution contains 8 g of AI. The pest population doubles every 7 days if untreated. The farmer wants the population to remain below 1 000 insects after 21 days, starting from 200 insects. The pesticide reduces the pest population by 70 % immediately after each application. The farmer may spray on day 0, day 7 and day 14. What is the minimum total amount of AI (in grams) the farmer must apply over the 21 days?
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About This Question
This is Waec Model Questions Vol1 2020 Agricultural Science Question 39. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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