Hazelnuts are their own plants.
Hazelnuts originally come from the region surrounding the Black Sea, particularly in areas of modern-day Turkey. They have been cultivated for thousands of years in this region, which is still the largest producer of hazelnuts today. Other countries, such as Italy and the United States, also grow hazelnuts, but Turkey remains the dominant source.
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.
the flower
stems