2.
<ul><li>Kingdom: Plantae Division: Magnoliophyta Class: Liliopsida Order: Asparagales Family: Alliaceae Genus: Allium Species: A. cepa </li></ul>

3.
<ul><li>Botanical name: Allium cepa </li></ul><ul><li>Family : Liliacea </li></ul><ul><li>Origin & distribution : Central Asia ( Iran &Pakistan) </li></ul>

4.
<ul><li>Onions have upright, cylindrical, green leaves attached to the swollen leaf bases that form the bulb below ground. </li></ul><ul><li>Onion plants grow to be about two feet high </li></ul><ul><li>Green onions, also called scallions, are either onions that are harvested when they are young or a special type of onion called bunching onion that has small bulbs. </li></ul>

5.
<ul><li>Onion are mainly available in red, white and yellow varieties. </li></ul><ul><li>Some of the onion varieties are Ailsa Craig, Red Baron, Centurion, Orion, Lisbon, Express Yellow . </li></ul>

7.
<ul><li>&quot;Long Day Bulbs&quot; begin to form a bulb, when there is 14-16 hours of daylight. They include Sweet Spanish Onions and Walla Walla onions. </li></ul><ul><li>&quot;Short Day Bulbs&quot; will begin to bulb when there is 12 - 14 hours of daylight hours. Short day bulbs include Yellow Granex, Texas Grano and Red Burgundy. </li></ul>

8.
<ul><li>March – August : Spring/summer fresh onions are available in this season and they are identified by light, thin skin coloured . </li></ul><ul><li>August – April : Fall/winter onions are available and are identified by thick , dark ,papery skin </li></ul>

9.
<ul><li>The main purpose of onion is cooking other than that it is used for </li></ul><ul><li>Treating bronchial pneumonia </li></ul><ul><li>Curing cough </li></ul><ul><li>To treat sore throats </li></ul><ul><li>To treat bee stings </li></ul><ul><li>To cure earache </li></ul><ul><li>It also boosts immune system </li></ul>