Which of the following is NOT affected by mosaic virus?

Mosaic viruses are a group of viral pathogens that can infect a variety of plants, often resulting in characteristic mottling or discoloration of the leaves. They can lead to significant yield losses and impact the overall health of affected crops.

Cotton is not typically affected by mosaic viruses in the same way that tomatoes, cucumbers, and soybeans are. While cotton can be susceptible to other types of diseases and pests, mosaic virus infections are not a major concern for cotton crops. On the other hand, tomatoes, cucumbers, and soybeans are well-known hosts for various mosaic viruses, which can cause noticeable symptoms and economic damage in those species.

In summary, recognizing that cotton is largely resistant or not commonly affected by mosaic viruses helps to identify it as the correct choice in this context. Understanding the host range of viral infections is crucial for effective crop management and disease control strategies.