The document discusses characteristics used for classifying living organisms, including whether they have eukaryotic or prokaryotic cells, whether they are unicellular or multicellular, their means of obtaining food (autotroph or heterotroph) and their body organization. Some key early classifiers, like Aristotle, grouped organisms based on their habitat of land, water or air.

2. CHAPTER 3
DIVERSITY IN LIVING
ORGANISMS

8. WHAT IS THE BASIS OF
CLASSIFICATION ?

9. Aristotle : Greek thinker
classified animals according to
whether they lived on
land, in water or in the air.

10. CHARACTERISTICS FOR
CLASSIFICATION
1. EUKARYOTIC CELL AND PROKARYOTIC
CELL
 Well defined nucleus:
Present in Eukaryotes
Absent in Prokaryotes
 Membrane bound cell organelles :
Present in Eukaryotes
Absent in Prokaryotes
 Form : Prokaryotes : mostly unicellular
Eukaryotes : mostly multicellular

11. CHARACTERISTICS FOR
CLASSIFICATION
2. UNICELLULAR OR MULTICELLULAR
A unicellular organism, also known as a
single-celled organism, is an organism that
consists of a single cell.
Multicellular organisms are composed of
more than one cell, with groups of cells
differentiating to take on specialized
functions.

12. CHARACTERISTICS FOR
CLASSIFICATION
3. FOOD
Autotrophs :
An autotroph is an organism that can produce
its own food using light, water, carbon
dioxide, or other chemicals.
Heterotrophs :
A heterotroph is an organism that eats other
plants or animals for energy and nutrients

13. CHARACTERISTICS FOR
CLASSIFICATION
4. BODY ORGANISATION
How the individual’s body develop
and organize its different parts,
and what are the specialized
organs found for different
functions?