Which one of the following hierarchial categories is the top taxonomical category?

The fundamental basic taxonomical unit of classification is

Fern is an example of

Five kingdom classification was proposed by

The organisms of kingdom protista are

Which one of the following is the example of Thallophyta?

Which one of the following is  a gymnosperm?

Whittaker proposed the classification of organisms into

In five kingdom classification, the blue green algae, nitrogen fixing bacteria and archaebacteria are included in the kingdom of