Saturday, May 22, 2010

Some viva questions from Pharmacognosy

Q: What do you know about ergot alkaloids?
Ans: These include alkaloids which we get from the ergot fungus Claviceps purpurea or derived semisynthetically.

Q: Give examples of ergot alkaloids?
Ans: Ergotamine, dihydroergotamine, ergonovine, methysergide, lysergic acid diethylamide (LSD).

Q: What do know about Glycoside?
Ans: It represents a derivative of sugar that decomposes into a sugar and non-sugar component. It is obtained by extraction of crude drug with alcohol. For example digitalis glycosides.

Q: What do you mean by essential oils?
Ans: These are the products obtained from plant having volatile nature. They represent the taste and odour of that particular plant from which these are obtained such as camphor, menthane and terpenes.

Q: What do you mean by antibiotic?
Ans: It represents a soluble substance which is obtained from bacterium or mold (fungus) having the ability of stopping the growth of micro-organisms. They are inactive against viruses.

Q: What do you know about vaccine?
Ans: Vaccine represents a product, having dead or weakened micro-organism of kind causing a specific disease, used to stimulate the immune system for the production of antibodies in competition with that specific disease.
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Further Reading:
Trease and Evans' Pharmacognosy
Fundamentals of Pharmacognosy and Phytotherapy
Pharmacognosy And Pharmacobiotechnology, 2nd Edition
Practical Pharmacognosy
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