yes
No, an iris is not a rhizome. A rhizome is a modified stem that grows horizontally underground and sends out roots and shoots. Irises have a rhizomatous root system, but the iris itself is not a rhizome.
No its not they are different vegetables.
Yes. However technically "root ginger" is a rhizome, not a root.
Rhizome
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Ginger (Zingiber officinale) is from the root or underground stem (rhizome).
Turmeric root. Rhizome
Perhaps you are searching for "sprout", "radix", "rhizome", or "tuber".
Ginger is used as a spice. It is the root (rhizome) of a plant known as Zingiber officinale, ginger also comes in a processed dried powder made from the root.
Ginger is the name of the entire plant. The bulbous parts you see in shops are actually called 'Rhizomes', however most places call them 'ginger root' to avoid confusion(the actual roots grow out of the Rhizomes, and they are rarely used in food). The leaves can be used to flavour food, and the flowers are also edible.
The frond or leaf grows directly from the root system as ferns do not have a true stem
The fragrant rhizome commonly used in perfume is called orris root, which is derived from the iris plant. It has a sweet, floral scent and is often used as a base note in various fragrances. Orris root is valued for its ability to add depth and complexity to perfume compositions.