Always remember in Pharmacognosy - examples are very important.

Unit 1: Definition and Scope of Pharmacognosy.
Unit 2: Plant, animal, mineral source with examples and uses.
Unit 3: Types of classification: examples
Unit 4: Factors influencing cultivation of medicinal plants. Mutation.
Unit 5: Not important.
Unit 6, 7, 8:
Please study each and every one from the following list:

Biological source, chemical constituents, uses of:
1) Acacia, Tragacanth, Pectin, Starch, Agar.
2) Shark Liver oil, castor oil, bees wax, wool fat, olive oil, cod liver oil.
3) All the drugs in unit 8.