Is polen a seed?

Spreading of seeds on the ground is known as sowing. And spreading of seeds by wind is known dispersal.

It's the seed from a sunflower.

it is the seed pod/ fruit. the seeds are found in the centre of the fruit, the seeds do not mature and are normally observed small dark specks

seeds

It is called a cotyledon. I'm not to sure about the definition, but I bet you could look it up. Hope this helps!!!!