How is the five-kingdom classification advantageous over the two kingdom classification?

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Ques: How is the five-kingdom classification advantageous over the two kingdom
classification?

Ans: Two Kingdom system of classification with the Plantae and Animalia kingdoms.

1. Two kingdom classification did not distinguish b/w the prokaryotes and eukaryotes.
E.g.: It brought together the prokaryotic bacteria and blue green algae(cyanobacteria) with other groups (like plant, fungi and animals) which were eukaryotic.
 
2. Two kingdom classification did not distinguish between the unicellular(single celled organism) and multicellular organisms. E.g: Chlamydomonas (unicellular) and Spirogyra (multicellular) were placed together under algae. 

3. This system did not differentiate between autotrophic/photosynthetic (green algae and
plants) and the heterotrophic/non-photosynthetic organisms (fungi).

Five Kingdom Classification:

1. Fungi were placed in a separate kingdom—kingdom fungi.

2. It has put together organisms which were placed in different kingdoms in earlier
classifications. Kingdom Protista bring together Chlamydomonas, Chlorella (earlier placed in algae within plants and both having cell walls) with Amoeba and Paramoecium (earlier plaeed in the animal kingdom and both lacking cell walls).
 
3. Animal and plant kingdoms become more homogenous than they are in the two kingdom
classification. So, it is the advantageous over the two kingdom classification. 


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