What do you mean by alkaloid?

It is a class of organic compounds that mainly found in higher plants.Alkaloids include morphine ,cocaine, coniine,nicotine etc.In the structure they contain one or more nitrogen hetrocyclic rings.Some of them are poisonous while some are used as medicines.They are mainly present in bark,seeds,leaves and root of the plant examples
(1) Coniine - It is the simplest alkaloid.It occurs in seeds of the hemlock herb.This alkaloid is very toxic to humans. It can cause paralysis and even death also.
(2) Piperine - This alkaloid is present in black pepper .It is used as an insecticide and also for flavouring.
(3) Nicotine - It is also an alkaloid occurs in the dried leaves of tobacco plant .It is harmful to humans in large doses and can also cause death.

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