Not sure what you're asking here - a dibber is a cylindrical object which tapers down to a rounded point, used for making drills to sow seeds in, or smaller ones to make holes in compost to drop seeds in. As for "pluk young plants", I've no idea what that means, I'm afraid.

I was as bit baffled myself Bamboo!!

Certainly tests the old cognitive powers, a lot of these questions these days, not to mention one's psychic abilities, lol, oh for a crystal ball

A dibber used before machine planting can be made with a broken spade or fork handle sharpened at the broken end, giving you the D top for your hand , useful for planting leeks and brassicas etc. The best ones have a steel pointed end. A small dibber can be an old biro for pricking out seedlings into seed trays to which you are referring. A multi dibber has 60 points and fits over a seed tray and is spring loaded to return upwards after being pressed down, this one gives you 60 holes for pricking out in evenly.

I think they mean the way you lift & separate seedlings before re-planting them with the dibber. I use an old metal tent peg if I cant find my dibber.

Oh right, I see Seaburn - I always use a small kids paintbrush, the ones you get in a box of paints (not the bristle end, obviously!)

My dibber is my index finger! Or sometimes a pencil. For planting leeks, the handle of my hoe serves quite nicely!