Theory:

Spices are the aromatic parts of tropical plants which are used traditionally to flavour food. It can also be the dried seeds or fruit of temperate plants.
Some spices can come from the bark or roots of certain plants, some can come from leaves and stems, but the majority are seeds, berries, or the dried fruits.
 
Spices are used in small quantities for the flavour, colour or as a food preservative. Some of the spices can be used as medicines too.
The active materials (phytochemicals) present in the spices are the main reason for their medicinal property.
Spices used in India:
The most popular spices used in Indian dishes include cardamom, black pepper, cinnamon, bay leaves, turmeric, cloves, curry leaves, nutmeg, ginger, ajwain. Some of the aromatic seed spices used includes coriander seeds, fennel, cumin, fenugreek, mustard, poppy seeds.
 
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Different types of spices
Medicinal plants:
Some of the plants can heal various diseases. These plants are called as medicinal plants.
Medicinal plants possess therapeutic properties or the plants that possess pharmacological effect that is beneficial for animals, including humans.
Medicinal plants are used to alleviate burns, cut, fever, cold, cough etc.
  • The phytochemicals are the chemical compounds present in the medicinal plant that acts against fungi, germs, and insects.
  • They are considered a rich source of ingredients that are used in the preparation of drugs.
List of plants that have high medicinal value:
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List of medicinal plant sources
Reference:
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