32 Questions
What sensation does astringent produce in the mouth?
Puckering feeling
What characteristic should methods used for phytochemical screening have?
Simple, rapid, designed for minimum use of equipment, reasonably selective, provide additional information
What does a brick red solution in Fehlings Test indicate?
Presence of reducing sugars
What is the purpose of chloroform in the preparation of alcoholic extract?
To prevent fungal growth
Define the term 'acrid' based on the provided text.
Producing an unpleasant irritating, tingling sensation
Why is it important for phytochemical screening methods to be reasonably selective?
To identify the class of compounds under study
How is the concentration of cyanogenic glycosides measured in the Guignard Test?
By the intensity of the red color
What color change indicates a positive result in the Guignard Test?
Bright red
What does the formation of a precipitate indicate in the Test for Quaternary Bases and Amine Oxides?
Presence of quaternary and/or amine oxide bases
How is the presence of alkaloids indicated in a test?
Formation of precipitate
What is the significance of stable and dense froth in a preliminary test?
Presence of free acids
What color precipitate indicates a positive result in the Ferric Chloride Test for tannins?
Greenish black, blue black to black
How is the presence of either primary, secondary, or tertiary alkaloids confirmed?
Positive result in the Confirmatory Test
How is the presence of glycosides indicated in a test?
Precipitation or turbidity
What is the definition of Pharmacognosy?
Pharmacognosy is an applied science dealing with the biological, biochemical, and economic features of natural drugs and their constituents.
What was the term used for 'material medica' in Western culture?
Material Medica
How is the presence of Fixed oil, Fats, and Volatile oils tested?
Stain Test on paper
What type of crystals are formed in Osazone Formation test?
Crystals
What does a honeycomb froth greater than 3cm above the surface indicate in a froth test?
Presence of saponins
What color indicates the presence of unsaturated steroids in the Salkowski Test?
Cherry red coloration
Who wrote the most famous commentary on drugs titled 'De Materia Medica libri cinque'?
Pedanios Diocorides
What color is indicative of a positive reaction in the Batesmith and Leucoanthocyanidins Metcalf Test?
Strong red violet color
Who is credited with introducing the term 'PHARMACOGNOSY' derived from Greek words pharmakon and gnosis?
C.A. Seydler
Which individual described the study of medicinal plants and their properties in the book 'Lehrbuch der Meteria Medica'?
J.A. Schmidt
What is indicated by a purplish solution in Molisch's Test?
Presence of carbohydrates
In the early 19th century, how did 'material medica' begin to divide?
It began to divide into pharmacology (the action of drugs) and pharmacognosy (all aspects of drugs with lesser emphasis on actions).
What color is produced in Seliwanoff's Test if a ketose is present?
Rose color
What does a red color indicate in the Test for pentoses?
Presence of pentoses
What color solution is formed in Keller Killiani Test that gradually turns to blue?
Reddish brown
What is one of the most important factors to be considered in phytochemical analysis?
Extracting solvent or the menstrum
Why is it difficult to determine the presence of a particular class of compounds in plants?
Large number of compounds occurring in the plant
Why is it easier to determine the absence or presence of phytoconstituents with a systemic phytochemical screening method?
Follows a systematic approach
Test your knowledge on the screening of plants through phytochemical analysis and evaluation of aqueous extracts. Explore concepts like metallic touch, mucilaginous, oily, astringent, pungent, acrid, and nauseous properties.
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