why were bacteria, cyanobacteria and fungi included in plant kingdom in the earlier classification systems?
These organisms were placed inkingdom Plantae in earlier classification because of the criteria of earlier clasification.
2-Kindgom classification propsed by Carlous Linneaus divided all living organisms into two kindgoms depending upon the physical features, e.g. plants were stationary and animals can move from one place to another. There was no distinction between eukaryotes and prokaryotes, photosynthetic and non-photosynthetic organisms, etc. He placed all the unicellular protozoans and multicellular animals under Animal kingdom.
2-Kindgom classification propsed by Carlous Linneaus divided all living organisms into two kindgoms depending upon the physical features, e.g. plants were stationary and animals can move from one place to another. There was no distinction between eukaryotes and prokaryotes, photosynthetic and non-photosynthetic organisms, etc. He placed all the unicellular protozoans and multicellular animals under Animal kingdom.