Summary biology biological classification notes

Biological Classification – NEET Notes
1. Introduction to Biological Classification
Biological classification is the systematic arrangement of living organisms
into groups and subgroups based on similarities and differences.

Need for Classification
 To study the vast diversity of organisms easily.
 To understand evolutionary relationships.
 To provide universal identification and naming.


2. Systems of Classification
2.1 Artificial System
 Based on superficial characters like habit, color, or number of stamens.
 Proposed by Aristotle (animals) and Theophrastus (plants).
 Less reliable.
2.2 Natural System
 Based on many characters such as morphology, anatomy, and
reproduction.
 Proposed by George Bentham and Joseph Hooker.
2.3 Phylogenetic System
 Based on evolutionary relationships.
 Most accepted system today.
 Proposed by Engler and Prantl.


3. Five Kingdom Classification (R.H. Whittaker,
1969)
Based on: - Cell structure - Body organization - Mode of nutrition -
Reproduction - Phylogenetic relationship

Five Kingdoms
1. Monera
2. Protista
3. Fungi
4. Plantae