Under the RH Whittaker classification system, algae are placed under which kingdom?

Dear student.

Algae was placed under kingdom Protista in Robert Whittaker classification.

Please refer the link below:

https://www.meritnation.com/ask-answer/question/five-kingdom-classification-was-proposed-by-r-h-whittaker-a/diversity-in-living-organisms/3579090