Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.

Why is a key helpful in the identification and classification of an organism?

Define and understand the following terms:

(i) Phylum 

(ii) Class 

(iii) Family 

(iv) Order 

(v) Genus

Try to collect all the currently accepted meanings for the word species. Discuss with your teacher the meaning of species in the case of higher plants and animals on one hand and bacteria on the other hand.

Can you identify the correct sequence of taxonomic categories?

(a) Species → Order → Phylum → Kingdom

(b) Genus → Species → Order → Kingdom

(c) Species → Genus → Order → Phylum