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Questions and Answers
In the Murexide test for caffeine, which of the following observations definitively confirms the presence of caffeine?
In the Murexide test for caffeine, which of the following observations definitively confirms the presence of caffeine?
- Formation of a yellow residue after evaporation with concentrated hydrochloric acid and hydrogen peroxide.
- Appearance of a transient green color upon the addition of concentrated hydrochloric acid.
- Precipitation of a crystalline solid insoluble in both water and concentrated acid.
- Transformation of a yellow residue to a violet color upon exposure to ammonia vapors after acidic treatment. (correct)
Ferric chloride ($FeCl_3$) reacts with tannins in an aqueous extract to produce a red color.
Ferric chloride ($FeCl_3$) reacts with tannins in an aqueous extract to produce a red color.
False (B)
The prolonged shaking of a powdered drug with water resulting in persistent froth indicates the presence of which class of compounds?
The prolonged shaking of a powdered drug with water resulting in persistent froth indicates the presence of which class of compounds?
- Terpenoids
- Alkaloids
- Flavonoids
- Saponin glycosides (correct)
How does the presence of caffeine in tea primarily affect the central nervous system (CNS)?
How does the presence of caffeine in tea primarily affect the central nervous system (CNS)?
What physiological effect attributed to tannins is most directly related to their categorization as antidiarrheal agents?
What physiological effect attributed to tannins is most directly related to their categorization as antidiarrheal agents?
What is the primary enzymatic action inhibited during the production of green tea to prevent tannin oxidation?
What is the primary enzymatic action inhibited during the production of green tea to prevent tannin oxidation?
Which specific structural attribute defines a leaf described as 'exstipulate'?
Which specific structural attribute defines a leaf described as 'exstipulate'?
What histological feature, observed under a microscope, distinctly characterizes Digitalis leaf powder?
What histological feature, observed under a microscope, distinctly characterizes Digitalis leaf powder?
What is the outcome of applying Baljet’s test to cardiac glycosides?
What is the outcome of applying Baljet’s test to cardiac glycosides?
What color change in the Keller-Killiani test confirms the presence of deoxy sugars in the glycone portion of cardiac glycosides?
What color change in the Keller-Killiani test confirms the presence of deoxy sugars in the glycone portion of cardiac glycosides?
Digitalis directly diminishes the rate and augment the intensity of myocardial contractions in a failing heart, concurrently elevating oxygen consumption.
Digitalis directly diminishes the rate and augment the intensity of myocardial contractions in a failing heart, concurrently elevating oxygen consumption.
In plant histology, what is the distinguishing feature of paracytic stomata?
In plant histology, what is the distinguishing feature of paracytic stomata?
What is the morphological description of venation when multiple major veins radiate out from a single point?
What is the morphological description of venation when multiple major veins radiate out from a single point?
How is a leaf blade categorized when it is divided into distinct, morphologically separate leaflets?
How is a leaf blade categorized when it is divided into distinct, morphologically separate leaflets?
The leaves' function is the assimilation of glucose and its derivative (starch) from water and carbon dioxide (photosynthesis) using energy provided by ______.
The leaves' function is the assimilation of glucose and its derivative (starch) from water and carbon dioxide (photosynthesis) using energy provided by ______.
According to the presented information, what is the primary distinction between green tea and black tea in terms of their production process?
According to the presented information, what is the primary distinction between green tea and black tea in terms of their production process?
How does the leaflet arrangement in imparipinnate compound leaves differ from that in paripinnate leaves?
How does the leaflet arrangement in imparipinnate compound leaves differ from that in paripinnate leaves?
Why is senna, containing anthraquinone glycosides, generally not recommended for use over extended periods?
Why is senna, containing anthraquinone glycosides, generally not recommended for use over extended periods?
In the context of Digitalis' cardiotonic action, which of the following is the most critical physiological effect?
In the context of Digitalis' cardiotonic action, which of the following is the most critical physiological effect?
When performing the Borntrager's test for free anthraquinones, what specific solvent is typically employed to extract the active constituents before adding ammonium hydroxide?
When performing the Borntrager's test for free anthraquinones, what specific solvent is typically employed to extract the active constituents before adding ammonium hydroxide?
Green tea promotes iron absorption.
Green tea promotes iron absorption.
What is meant by describing the margin of a leaf as 'ciliated'?
What is meant by describing the margin of a leaf as 'ciliated'?
What is a 'cotyledon'?
What is a 'cotyledon'?
What accounts for the contrasting effects between green tea and black tea regarding caffeine content?
What accounts for the contrasting effects between green tea and black tea regarding caffeine content?
How would a leaf with parallel venation and multiple main veins radiating from the base be classified?
How would a leaf with parallel venation and multiple main veins radiating from the base be classified?
The presence of calcium oxalate crystals in plant cells is often considered a defense mechanism; however, which factor primarily determines if such crystals are visible within a crystal sheath under microscopic examination?
The presence of calcium oxalate crystals in plant cells is often considered a defense mechanism; however, which factor primarily determines if such crystals are visible within a crystal sheath under microscopic examination?
While green tea may possess antioxidant properties, it cannot exert any form of anti-tumor activity.
While green tea may possess antioxidant properties, it cannot exert any form of anti-tumor activity.
Senna-containing herbal laxatives should be used with caution under which circumstances?
Senna-containing herbal laxatives should be used with caution under which circumstances?
What term describes leaves arising three or more from a single node on a stem?
What term describes leaves arising three or more from a single node on a stem?
Match the term with its corresponding description regarding leaf shape and margins:
Match the term with its corresponding description regarding leaf shape and margins:
In the analysis of powdered plant material, which of the following is an expected outcome of the KOH test for flavonoid glycosides?
In the analysis of powdered plant material, which of the following is an expected outcome of the KOH test for flavonoid glycosides?
The cumulative effects of cardiac glycosides in medications such as Digitalis necessitate what specific precaution?
The cumulative effects of cardiac glycosides in medications such as Digitalis necessitate what specific precaution?
Patients with gastric ulcers who consume large quantities of tea may exacerbate their condition due to which causative factor?
Patients with gastric ulcers who consume large quantities of tea may exacerbate their condition due to which causative factor?
Black tea obtains its color from?
Black tea obtains its color from?
What is the origin name for senna?
What is the origin name for senna?
Senna's active constituents are:
Senna's active constituents are:
Senna medicinal uses:
Senna medicinal uses:
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