You have seen the failed drop of carrots, now enjoy some images of beautiful flowers of carrots.
When the carrot is ready, it sends up a tall stem, which produces flowers, and eventually seeds. The seeds are very small and black.
If you are planning to grow carrots and don't want to buy seeds every year, you need to remember that letting one go to seed is not going to work. Carrots are biennial - that means they take two years to reach maturity when they can produce seeds.
The birds-nest-shaped fruit cluster of carrot has a remarkable mechanism for seed dispersal. When conditions are dry and suitable for seed dispersal they bend outward, exposing the fruits to wind and animals; when conditions are wet, they bend inwards, forming the familiar bird's nest structure, which protects the seeds.
Info source : World Carrot Museum