Gce Model Questions Vol1 2025 Agricultural Science Question 14

Practice objective / multiple choice question 14 from the 2025 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2025 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 14 GCE_MODEL_QUESTIONS_VOL1 • 2025 • AGRICULTURAL_SCIENCE • objective

In a 2‑ha wheat field, a fungal disease initially infects 8 % of the plants. Each week a fungicide is applied that kills 60 % of the infected plants, but new infections arise at a rate of 5 % of the remaining healthy plants. Using a recurrence relation, determine after how many weeks the disease incidence will fall below 2 %.

Answer Options

A. The incidence falls below 2 % after 9 weeks.
B. The incidence never falls below 2 % (it stabilises at about 6.5 %).
Correct Answer C. The incidence never falls below 2 % (it stabilises at about 8.1 %).
D. The incidence falls below 2 % after 4 weeks.
Correct Answer
C
Correct Option:
The incidence never falls below 2 % (it stabilises at about 8.1 %).

About This Question

This is Gce Model Questions Vol1 2025 Agricultural Science Question 14. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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