This document discusses systems of classification of living organisms. It introduces taxonomy as the theory and practice of classifying organisms based on their relatedness. It defines biodiversity as the diversity of life forms on Earth, including diversity among and within species as well as diversity of ecosystems. The document notes that over 3.5 billion years of evolution have resulted in over 1.4 million known species today, though the actual number is likely much higher, and extinction rates are currently around 50 times the background rate. It discusses the importance of classification for understanding the wide variety of organisms and the relationships between groups, as well as its use in fields like biogeography and ecology.

1. Diversity in Living
Organism
Class 9

2. Introduction
• Approach for a
systematic arrangement
of organisms.
• Content
• 1) Importance of living
world
• 2) kingdom of system of
classification
• 3) Plant kingdom
• 4) Animal kingdom

3. TAXONOMY -
* Systematic
arrangement of
organisms on basis
of their
relatedness
* theory &
practice of
classifying
organism

4. Diversity of life
*diversity - wide
variety of
organisms in our
world
*Species diversity
- Measure -
species richness
and its distribution

5. Diversity of life
*3.5 billion years
of organic
evloution
*Presently - 1.4
known
* 50 times more
extinction

6. Definition
* Taxonomy
theory and practice of
classifying organisms
* Biodiversity -
Diversity of life forms

7. IMPORTANCE OF CLASSIFICATION
• To study - wide variety of organism easy
• Picture of all life form at a glance
• To understand relations among groups of organisms
• Science of biogeography, ecology, ethology studies
understanding

8. BIODIVERSITY
*Biological
diversity
* term - Walter G.
Rosen
* Variability -
among, within
species and of
ecosystems

9. SYSTEMS OF CLASSIFICATION
• Artificial system of classification
• 1) Aristotle
• 2) Theophrastus