| 1. | Cuttlefish – Mollusca, a class | 
| 2. | Humans – Primate, the family | 
| 3. | Housefly – Musca, an order | 
| 4. | Tiger – Tigris, the species | 
Two plants can be conclusively said to belong to the same species if they:
| 1. | can reproduce freely with each other and form seeds | 
| 2. | have more than 90 percent similar genes | 
| 3. | look similar and possess identical secondary metabolites | 
| 4. | have the same number of chromosomes | 
ICBN stands for:
| 1. | Indian Congress of Biological Names | 
| 2. | International Code of Botanical Nomenclature | 
| 3. | Indian Code of Botanical Nomenclature | 
| 4. | International Congress of Biological Names |