Question

Why blue green algae is taken under monera and not under plantae?

Answer 1

On the other hand, the genetic material of plants and other eukaryotes is held in the cell nucleus. Therefore, bluegreen algae are placed in KingdomMonera and not inKingdom Plantae. 

hope it clarifies ur doubt dear friend..

Answer 2

Monera are prokaryotic unicellular bacteria whose genetic material is dispersed loosely in the cell.so the blue green algae is under Monera but not plantae...