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.
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.
Onion, potato, ginger, garlic, turmeric.
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Plant leaves as food: The leafy vegetables are nothing but leaves of the plants.
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.
Flowers of banana plant, pumpkin plant, sunflower oil.
Fruits as food: There are some plants which store food in their fruits. We eat the fruits of such plants as food.
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.
Wheat, rice, maize, millet, peas, pulses, mustard, groundnut, soyabean.
Oil seed: Groundnut and mustard seeds are also known as oilseeds because we extract an edible oil from them for cooking. 
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Fenugreek plant has two edible parts: The leaves of the plant used as a vegetable, and the seed used to extract mustard oil.
Not all the plants are edible, some may be poisonous too.
Oleander, Castor bean, Datura Stramonium, Dieffenbachia.