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In five kingdom system, the main basis of classification : -
A
Structure of nucleus
B
Nutrition
C
Structure of cell wall
D
Asexual reproduction
Detailed Solution
R. H. Whittaker (1969) proposed the five kingdom classification: Monera, Protista, Fungi, Plantae and Animalia.
His criteria were cell structure (prokaryotic or eukaryotic), body organisation (unicellular or multicellular), mode of nutrition, reproduction and phylogenetic relationships.
Among these, the mode of nutrition is the main basis that separates the three multicellular kingdoms: Plantae (autotrophic, photosynthetic), Fungi (heterotrophic, absorptive) and Animalia (heterotrophic, ingestive).
So, as per the answer key, the main basis of the five kingdom system is nutrition.
His criteria were cell structure (prokaryotic or eukaryotic), body organisation (unicellular or multicellular), mode of nutrition, reproduction and phylogenetic relationships.
Among these, the mode of nutrition is the main basis that separates the three multicellular kingdoms: Plantae (autotrophic, photosynthetic), Fungi (heterotrophic, absorptive) and Animalia (heterotrophic, ingestive).
So, as per the answer key, the main basis of the five kingdom system is nutrition.