Neco Model Questions Vol1 2020 Agricultural Science Question 24

Practice objective / multiple choice question 24 from the 2020 Neco Model Questions Vol1 Agricultural Science examination.

Neco Model Questions Vol1 2020 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 24 NECO_MODEL_QUESTIONS_VOL1 • 2020 • AGRICULTURAL_SCIENCE • objective

A disease‑causing pathogen persists in soil for 2 years after a susceptible crop (Crop A) is grown. Crop B is a non‑host and reduces the pathogen inoculum by 30% each year it is grown. Crop C is a partial host and cuts the inoculum by 50% each year it is grown. Initially the inoculum level is 100 units and the economic threshold is 20 units. Design a 6‑year rotation using Crops A, B and C (any crop may be repeated) that keeps the inoculum at or below the threshold after the sixth year. State the yearly sequence and the final inoculum level.

Answer Options

Correct Answer A. Sequence: B, C, B, C, B, C; final inoculum ≈ 4.3 units (≤20)
B. Sequence: B, B, C, B, C, B; final inoculum ≈ 7.2 units (≤20)
C. Sequence: B, C, B, C, B, B; final inoculum ≈ 9.8 units (≤20)
D. Sequence: C, B, C, B, C, B; final inoculum ≈ 5.1 units (≤20)
Correct Answer
A
Correct Option:
Sequence: B, C, B, C, B, C; final inoculum ≈ 4.3 units (≤20)

About This Question

This is Neco Model Questions Vol1 2020 Agricultural Science Question 24. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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