How many criteria were used by Whittaker for classification?

Correct option is D

Ans.(d) 5

Explanation:
The correct answer is 5. Robert H. Whittaker proposed a Five-Kingdom Classification based on fundamental biological characteristics. These five kingdoms are:

1. Monera – Unicellular prokaryotic organisms (bacteria).
2. Protista – Unicellular eukaryotic organisms (protozoa, algae).
3. Fungi – Heterotrophic, spore-producing organisms (molds, mushrooms).
4. Plantae – Multicellular, autotrophic organisms (plants).
5. Animalia – Multicellular, heterotrophic organisms (animals).

Information Booster:
● This classification considers cell structure, mode of nutrition, reproduction, and evolutionary relationships.
● It separates prokaryotic (Monera) and eukaryotic organisms for better understanding.
● Fungi were given a separate kingdom due to their unique heterotrophic absorption mode of nutrition.
● The classification has been improved with the six-kingdom and three-domain systems.
● Whittaker’s system remains fundamental in modern biology.
● The classification aids in scientific study and biodiversity conservation.
● It is widely accepted in educational curricula and research.