Theory:

Plant products are materials derived from the body of plants.

The various parts of the plants which are used as food material by us include: roots, stems, leaves, flowers, fruits and seeds.
 
Plant roots as food: We eat the roots of some plants as food.
Example:
Carrot, radish, beetroot, sweet potato, turnip.
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Plant stem as food: Some plants store food in their stems (modified or underground). We eat the stems of such plants as food.
Example:
Onion, potato, ginger, garlic, turmeric.
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Plant leaves as food: The leafy vegetables are the leaves of the plants.
Example:
Spinach, cabbage, lettuce, leaves of mustard plant.
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Flowers as food: The flowers of some of the plants are eaten as food.
Example:
Flowers of banana plant, pumpkin plant, sunflower oil.
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Fruits as food: There are some plants which store food in their fruits. We eat the fruits of such plants as food.
Example:
Apple, orange, mango, pears, banana, plum, grapes, guava.
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Seeds as food: Some of the plants store food in their seeds. We eat the seeds of these plants as food.
Example:
Wheat, rice, maize, millet, peas, pulses, mustard, groundnut, soyabean.
Oil seed: Groundnut and mustard seeds are called oil seeds because they are used to extract edible oils which are used for cooking food.
 
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Fenugreek plant have two edible parts: Leaves are used as leafy vegetable, Seeds of fenugreek plant are used to extract mustard oil.
 
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Important!
Not all the plants are edible, some may be poisonous too.
Example:
Oleander, Castor bean, DaturaStramonium, Dieffenbachia.
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