The correct option for the question "An example of fungal disease of stored grains is" is C. soft rot. Explanation of the Correct Answer (C. Soft Rot) Soft rot is a fungal disease that affects stored grains and other plant materials. It is primarily caused by fungi such as Botrytis and Penicillium, which thrive in moist conditions. When grains are stored improperly or if they have high moisture content, these fungi can proliferate, leading to the decay of the grains. How Soft Rot Affects Stored Grains:

1. Moisture Content: Fungi require moisture to grow. If grains are stored with a moisture content above 14%, they become susceptible to fungal infections.
2. Temperature: Warm temperatures can also promote fungal growth. Ideal conditions for soft rot are typically between 20°C to 30°C (68°F to 86°F).
3. Symptoms: Infected grains may appear discolored, soft, and may emit a foul odor. The grains lose their structural integrity, making them unfit for consumption or sale.
4. Impact on Yield: Soft rot can lead to significant losses in stored grain quality and quantity, affecting food supply and economic stability for farmers.

Why the Other Options Are Incorrect A. Rosette: - Rosette is not a fungal disease but rather a viral disease that affects various crops, particularly in the family of legumes. It causes stunted growth and leaf curling, but it does not specifically target stored grains. B. Wilt: - Wilt diseases are typically caused by bacteria or fungi that infect the vascular system of plants, leading to wilting and death of the plant. While some wilt diseases can affect crops before harvest, they do not specifically pertain to stored grains. D. Damping Off: - Damping off is a term used to describe a range of fungal diseases that affect seedlings, particularly in nursery settings. It is caused by pathogens like Pythium and Rhizoctonia. While it is a significant issue in plant propagation, it does not apply to stored grains. Summary of Key Points

• Soft rot is a fungal disease affecting stored grains, caused by fungi like Botrytis and Penicillium.
• It thrives in high moisture and warm temperatures, leading to decay and loss of grain quality.
• Other options (A. Rosette, B. Wilt, D. Damping Off) do not pertain to stored grains and are either viral or bacterial diseases affecting live plants or seedlings.

Revision Summary

• Soft rot is a fungal disease of stored grains.
• It is caused by moisture-loving fungi and leads to grain decay.
• Other options listed are not related to stored grains and involve different pathogens or plant stages.
• Understanding the conditions that promote fungal growth is crucial for effective grain storage management.