Concept:A pappus is a tuft of hairs modified to act like a parachute, enabling dispersal through air.
Explanation:The pappus is a modified calyx present on certain fruits, such as those of dandelion and sunflower.
It is made of many light, feathery hairs that spread out widely.
This structure increases the surface area and creates air resistance.
When the wind blows, it catches the pappus and lifts the fruit into the air.
The fruit then floats like a parachute and travels to distant places.
Therefore, such fruits are dispersed by wind and not by explosion, mammals, or water.
Answer:D. wind