Waec Model Questions Vol1 2017 Geography Question 18
Practice objective / multiple choice question 18 from the 2017 Waec Model Questions Vol1 Geography examination.
After a volcanic eruption, a 100‑unit area undergoes primary succession. Pioneer species colonise bare ground at 5 % of the remaining bare area each year until they occupy 40 % of the total area. Thereafter, secondary species replace pioneer vegetation at a rate of 10 % of the existing pioneer area per year. How many years from the start of succession will it take for secondary species to cover at least 30 % of the total area?
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About This Question
This is Waec Model Questions Vol1 2017 Geography Question 18. It is one of the objective questions from the 2017 Waec Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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