Each unit or category of classification is termed as a taxon. It represents a rank.
For example, the basic level of classification is species, followed by genus, family, order, class, phylum or division, in ascending order. The highest level of classification is known as kingdom.
| Column I | Column II | ||
| a. | Herbarium | i. | It is a place having a collection of preserved plants and animals. |
| b. | Key | ii. | A list that enumerates methodically all the species found in an area with brief description aiding identification. |
| c. | Museum | iii. | Is a place where dried and pressed plant specimens mounted on sheets are kept. |
| d. | Catalogue | iv. | A booklet containing a list of characters and their alternates which are helpful in identification of various taxa. |
Find the mean deviation about the mean for the data 38, 70, 48, 40, 42, 55, 63, 46, 54, 44.