Almost every part of plants furnishes food, but more especially seeds, roots, stems, leaves. These may be classified as follows: -

A. Seeds And Fruits

(a) Cereals. - Wheat, oats, maize, etc.

(b) Pulses. - Peas, beans, lentils.

(c) Fruits and Nuts. - Oranges, almonds, walnuts.

B. Tubers And Roots

Tubers - Potatoes, Jerusalem artichokes, yams. Roots. - Carrots, turnips, radishes.

C. Stems And Leaves

Green Vegetables.