Who proposed the natural classification of plants?

Which scientist classified plants into $24$ groups based on their sexual characteristics?

Fungi differ from bacteria in:

Read the following four statements $(A-D)$ carefully.
$(A)$ Viruses,viroids and lichens are not included in the five kingdom system of classification.
$(B)$ The mode of nutrition in kingdom animalia is holophytic.
$(C)$ Phycomycetes,Ascomycetes,Basidiomycetes and Deuteromycetes are the four families of kingdom fungi.
$(D)$ Bacteria are cosmopolitan in distribution.
How many of the above statements are not correct :

Which classification system of organisms was proposed by $R.H. Whittaker$?

In which of the following organisms is the presence of a rigid cell wall observed?