Biology Exam Preparation Portal. Preparing with U 4 ur exams...

Classification of Living Things- System of classification

The term taxonomy was coined by De Condolle. Carl Linnaeus was regarded as the father of classification (taxonomy). He proposed two kingdom classification of living beings into Plantae and Animalia. Endlicher coined the term ‘thallophyta’
1. Two kingdom classification
  • Carl Linnaeus (1758) proposed two kingdom classifications: Kingdom Plantae and Kingdom Animalia.
two kingdom classification
  • Bernard De Jussieusa modified 2 kingdom classifications.
  • He divided plants into 3 groups: Acotyledonae, Monocotyledonae and Dicotyledonae
  • Eichler (1880): classified plant kingdom into two major groups
  • Based on presence or absence of seeds into cryptogams (non-seeded plants) and Phanerogams or spermatophyta (seeded plants)
  • Tippo 1942 classified plant kingdom on the basis of the absence or presence of embryo into thallophyta (plants without embryo) and Embryophyta (plants with embryo)
2. Three Kingdom Classification (Haeckel, 1866)
• Plant
• Animal
• Protista
3. Four Kingdom classification (Copeland, 1956)
  • Monera
  • Protista
  • Metaphyta (Eukaryotic plants)
  • metazoan (Eukaryotic animals )
4. Five Kingdom classification (R.H Whittaker ,1969)
Criterion for classification:
a) Complexity of cell structure: prokaryotic and Eukaryotic
b) Complexity of organisms: Unicellular or multicellular
c) Mode of nutrition:
  • Plantae (autotrophs)
  • Fungi (heterotrophs and saprobic absorption
  • Animalia (heterotrophs and ingestion)
d) Life style:
  • Producers (Plantae)
  • Consumers (Animalia)
  • Decomposers (Fungi)
e) Phylogentic relationships: prokaryotes to eukaryotes, unicellular to multicellular organisms


5. Six Kingdom Classification
· Gray and Doolittle (1982)
· On the basis of gene sequences 
Six Kingdom classification

6. Three domain system

Three domains of Life
Three domains of life
  • Proposed by Carl Woese 1990
  • Classified on the basis of 16S rRNA
MCQs
Difference Between

Sharing is Caring ..... Please take 5 seconds to Share. Thank you...

1 comments:

  1. Thank you. This really helped...

    ReplyDelete

We love to hear from you! Leave us a comment.

© Biology Exams 4 U, AllRightsReserved.***Best viewed in Google Chrome and Mozilla firefox***

Maintained by BiologyExams4U.com