Waec Model Questions Vol1 2020 Agricultural Science Question 48
Practice objective / multiple choice question 48 from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
A forest stand contains 120 trees ha⁻¹. The diameters at breast height (DBH) are distributed as follows: 30 trees have DBH = 10 cm, 50 trees have DBH = 15 cm, and 40 trees have DBH = 20 cm. Basal area of a tree is BA = π × (DBH/200)² (m²). The forest manager wants to reduce the stand basal area by 20 % by removing only the 20‑cm trees. What is the minimum number of 20‑cm trees that must be removed to achieve the target basal area?
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About This Question
This is Waec Model Questions Vol1 2020 Agricultural Science Question 48. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Hard .
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