The mosaic symptom commonly associated with viral diseases of crops can be best observed on

Assessment: WAEC SSCE - Agricultural Science - 1990 (Objective) Subject: Agricultural Science

Question 1 Report

The mosaic symptom commonly associated with viral diseases of crops can be best observed on
Answer Details
The mosaic symptom commonly associated with viral diseases of crops can be best observed on the leaves. Mosaic symptoms refer to a pattern of light and dark green or yellow patches that can appear on the leaves of infected plants. This pattern resembles a mosaic or patchwork, hence the name. This symptom is a common indicator of viral diseases that can affect a wide range of crops, including tomatoes, potatoes, cucumbers, and tobacco. Since the mosaic pattern is most visible on the leaves, it is the best place to observe and identify the symptom. However, symptoms may also appear on other parts of the plant, such as the stem or fruit, depending on the specific virus and the crop it infects.
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