Minecraft villagers?

I have a question and I'm playing Minecraft on my tablet. How do I give farmers seeds to plant my fields?

The crops and plants by themselves and you do not get the items.

When I have a wheat farm, I've seen you can "turn it on" and somehow right-click to throw seeds on the PC. But how does it work with the tablet?

Just drop the seeds on the villager and sooner or later you will pick them up!