Waec Model Questions Vol1 2020 Agricultural Science Question 4

Practice objective / multiple choice question 4 from the 2020 Waec Model Questions Vol1 Agricultural Science examination.

Waec Model Questions Vol1 2020 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • AGRICULTURAL_SCIENCE • objective

A farmer's tomato crop shows circular leaf spots surrounded by yellow halos, and the fruits later develop concentric rings of necrosis. Laboratory examination reveals the pathogen produces conidia in chains and a sexual stage that forms ascospores. Identify the disease, name the causal organism group, and outline an integrated management strategy that includes cultural, chemical, and biological control measures.

Answer Options

A. Bacterial speck; causal organism group: Bacterial (Pseudomonas syringae pv. tomato); integrated management: sanitation, copper sprays, biological control with Pseudomonas fluorescens
Correct Answer B. Early blight; causal organism group: Ascomycete fungi (Alternaria solani); integrated management: crop rotation, resistant varieties, good spacing and sanitation; copper‑based or systemic fungicide applications; biological control with Bacillus subtilis or Trichoderma harzianum
C. Septoria leaf spot; causal organism group: Ascomycete fungi (Septoria lycopersici); integrated management: crop rotation, use of fungicide chlorothalonil, seed treatment with beneficial bacteria
D. Late blight; causal organism group: Oomycete (Phytophthora infestans); integrated management: use resistant varieties, apply metalaxyl fungicide, remove infected plants, apply compost teas
Correct Answer
B
Correct Option:
Early blight; causal organism group: Ascomycete fungi (Alternaria solani); integrated management: crop rotation, resistant varieties, good spacing and sanitation; copper‑based or systemic fungicide applications; biological control with Bacillus subtilis or Trichoderma harzianum

About This Question

This is Waec Model Questions Vol1 2020 Agricultural Science Question 4. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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