a. | Keys are based on the similarities and dissimilarities. |
b. | Key is analytical in nature. |
c. | Keys are based on the contrasting characters in pair called couplets. |
d. | Same key can be used for all taxonomic categories. |
e | Each statement in the key is called Lead. |
Herbarium, Botanical gardens, Museum, Zoological parks and Key are considered as:
1. Trophic aids
2. Environmental aids
3. Pollution aids
4. Taxonomical aids