The Pomegranate (Punica granatum) is a fruit-bearing deciduous shrub or small tree growing to 5-8m tall. The pomegranate is believed to have originated in eastern Iran and eastward, but its true native range is not accurately known because of millennia of extensive cultivation.
The carrot (Daucus carota) is a root vegetable, usually orange or white in color with a woody texture. The edible part of a carrot is a taproot. It is a biennial plant which grows a rosette of leaves in the spring and summer while building up the stout taproot, which stores large amounts of sugars for the plant to flower in the second year.
Onion in the general sense can be used for any plant in the genus Allium but used without qualifiers usually means Allium cepa, also called the garden onion. Onions (usually but not exclusively the bulbs) are edible with a distinctive strong flavour and pungent odour which is mellowed and sweetened by cooking.