Hazelnuts are their own plants.
An ovary is the part of the plant an apple comes from.
A beet is a root plant.
Banana is the fruit of a plant
Parsnips come from the root of the parsnip plant. They are a biennial plant, and the edible part is the thick, white taproot that grows beneath the ground.
It is a plant in it's own right, not part of anything else.
kiwi comes from the bud of the plant
Caraway is the seed of the caraway plant.
stem
Root.
stems
the flower
The root.