List of top Pharmacognosy Questions on Adulteration and evaluation of crude drugs

Which of the following tests is used for best detecting the presence of excessive silica in crude drugs?
The major pharmacognostic feature of Terminalia arjuna bark is the presence of .
The following are adulterants of clove except one, choose the most appropriate option:
One of the following is an example of chemical method of evaluation
Match the crude drug with its biological source
1. Pale catechu(P) Conium naculatum
2. Clove(Q) Cymapsistetragonoloba
3. Gaur bean(R) Uncariagambir
4. HemlockS) Syzygiumaromaticum