Question

Earliest scientific classification was given by Aristotle. Aristotle classified animals into

• A. Prokaryotes and Eukaryotes
• B. Protozoa and Metazoa
• C. Autotrophic and Heterotrophic
• D. Those which had red blood and those which did not

Answer 1

The correct option is D Those which had red blood and those which did not

Introduction to Aristotle's classification system

Aristotle classified organisms into plants and animals. He classified organisms on the basis of morphology.

Classification of plants and animals

Plants were further divided into herbs, shrubs and trees on the basis of morphological characters.

Animals were further divided into two categories, one comprising those having red blood (Enaima) and the other without red blood (Anaima).

Final answer

(b) those which had red blood and those which did not