What kind of modified structure are onions

The main stem of onion is the only flat disc stem at the base of the bulb. It does not have any segments, nodes, or intermediate nodes. So an onion is not a stem at least to the part we eat.

Also read: Are Peanuts fruits, nuts, or vegetables? Onion is a tunicated bulb. The bulb resembles a flat disc-like underground stem structure that supports the root system and develops the leaves. This scientific classification states that an onion is a modified stem. It contains a flat stem with the roots.

This stem has a central concentric leaf structure. This is exactly what we see and eat. If you slice an onion vertically then you can see a defined circular compact structure of fleshy leaves. New leaves originate at the center. The leaves grow big and get replaced by more new leaves.

This continuous growth increases the size of the entire bulb. The major portion of an onion bulb is comprised of leaves but these are not photosynthetic leaves. The onion plants need green leaves for photosynthesis like others. This is how we get our green sprout onions.

Onion is a perennial plant but commercially it is grown as annuals. It is harvested before attaining its maturity. We do so because when onion plants get mature it grows along a central stem tube and starts blooming. At this time the starch store in the bulb is used to feed the flowers and seeds it produces.

This means we have nothing left to eat now. When function of the leaf blade is no longer primarily photosynthesis, some other plant part is usually modified to take its place.

A phyllode is a petiole that has become flat and photosynthetic, looking much like a leaf blade. When an unlucky insect touches the trigger hairs inside the leaf, the trap suddenly closes.

The roots are modified to have root hairs and branch indiscriminately with cells that take in water and nutrients, while the stems are modified to move water and nutrients to and from the leaves and flowers. An onion is a bulb, which is a kind of root. Green onion are leaves. Onion is actually a combination of stem and scale leaves. Stem of onion is discoid disc shaped and it is a underground modification of stem which falls under the category of Bulb Outer thin papery scale leaves which form the protective covering.

No; it is the bulb a modified stem where carbohydrates and other food materials are stored in onion plant. Is flower a modified stem or modified leaf? Yellow onions, white onions, red onions, and sweet onions can all yield green onions. An onion is a bulb a short stem with fleshy leaves or leaf bases. This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Read More. Cell Introduction 2.

Cell Structure 3. Membrane Structure 4. Membrane Transport 5. Origin of Cells 6. Cell Division 2: Molecular Biology 1. Metabolic Molecules 2. Water 3. Protein 5. Enzymes 6. Cell Respiration 9. Photosynthesis 3: Genetics 1.