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Q.
Which of the following kingdoms has no well defined boundaries?
Biological Classification
Solution:
Although all single-celled eukaryotes (except some unicellular algae, e.g., Chlamydomonas, Chlorella etc., fungi, e.g., yeasts and animals, which are placed in their respective kingdoms along with their closely related multicellular organisms) are placed in Kingdom Protista, yet its boundaries are not well defined.