Gce Model Questions Vol1 2022 Agricultural Science Question 28

Practice objective / multiple choice question 28 from the 2022 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2022 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 28 GCE_MODEL_QUESTIONS_VOL1 • 2022 • AGRICULTURAL_SCIENCE • objective

In a 2‑ha maize field, ten 0.1‑ha quadrats are surveyed. The numbers of infected plants in the quadrats are: 45, 52, 38, 60, 47, 55, 42, 50, 48, 53. Each quadrat contains 100 plants. The disease severity index (DSI) is defined as \(\frac{\sum \text{infected plants}}{\text{total plants surveyed}}\times100\). A fungicide reduces infection in each quadrat by 20%. Calculate (a) the DSI before treatment, (b) the DSI after treatment, and (c) the percentage reduction in DSI caused by the fungicide.

Answer Options

Correct Answer A. DSI before = 49%; DSI after = 39.2%; reduction = 20%
B. DSI before = 48%; DSI after = 38.4%; reduction = 20%
C. DSI before = 50%; DSI after = 40%; reduction = 20%
D. DSI before = 49%; DSI after = 37.5%; reduction = 23%
Correct Answer
A
Correct Option:
DSI before = 49%; DSI after = 39.2%; reduction = 20%

About This Question

This is Gce Model Questions Vol1 2022 Agricultural Science Question 28. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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