1. Birds
2. Dust blowing
3. Rain
4. Wind blowing
Which of the above spread plant diseases?
Explanation
Birds can act as carriers of plant pathogens. As they move through crops, pathogens may stick to their feathers, beaks, or feet, transferring them from infected plants to healthy ones. Dust particles often carry fungal spores or bacterial cells. When dust is blown by the wind, these pathogens can travel to new areas, causing infections in plants far from the original source. Rainwater, particularly during heavy downpours or storms, can facilitate the spread of pathogens. Raindrops pick up pathogens from infected plants or soil and splash them onto healthy plants, promoting disease transmission. Wind plays a significant role in transporting pathogens such as fungal spores, bacteria, or insect vectors contaminated with viruses. This mechanism allows pathogens to infect plants located far from the initial infection site.
You can try, The "NOT" approach for all statements, this tests the improbability of negating a statement--if denying its impact seems highly unlikely, the statement is plausibly true. For Example: Birds or Rain or Wind NOT Spread plant diseases. Absurd, unlikely. Hence all original are likely true.