Question:
The quantitative value determined for the identification of leaf drug remains constant throughout the age of the plant EXCEPT:
The quantitative value determined for the identification of leaf drug remains constant throughout the age of the plant EXCEPT:
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Stomatal Index is Constant; Stomatal Number is Variable.
Updated On: May 25, 2026
- Vein termination number
- Stomatal number
- Vein islet number
- Stomatal index
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Leaf constants are microscopy-based quantitative parameters used for the standardization of crude drugs.
Step 2: Meaning
A reliable constant should not vary significantly with the environment or the age of the plant.
Step 3: Analysis
Vein islet number, vein termination number, and stomatal index are generally constant for a species. However, the total number of stomata per unit area (Stomatal number) changes as the leaf grows and expands.
Step 4: Conclusion
Unlike the Stomatal Index, the Stomatal Number is variable and depends on the age of the leaf. Final Answer: (b)
Leaf constants are microscopy-based quantitative parameters used for the standardization of crude drugs.
Step 2: Meaning
A reliable constant should not vary significantly with the environment or the age of the plant.
Step 3: Analysis
Vein islet number, vein termination number, and stomatal index are generally constant for a species. However, the total number of stomata per unit area (Stomatal number) changes as the leaf grows and expands.
Step 4: Conclusion
Unlike the Stomatal Index, the Stomatal Number is variable and depends on the age of the leaf. Final Answer: (b)
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