Two-kingdom classification, Biology

Assignment Help:

Two-Kingdom Classification

The history of taxonomy is as old as man himself. It may be traced back to prehistoric times because man had learnt to designate living organisms by specific names very early in his evolutionary history. Much before the advent of civilisation living things had been categorised into animals and plants. Hippocrates (460-370 BC), Aristotle (384-322 BC) and many others had tried to put some order into the chaos of the bewilderingly large number of different life forms. Aristotle appears to have been the first to attempt a logical system of classification. He classified animals on the basis of presence or absence of blood as Sanguineous (with blood) and Non-sanguineous (without blood). He believed that in evolution, life had been directed towards a perfect animal form, having blood (Table 1.6). He incorporated this idea which is a hierarchical system of classification In his book entitled 'Scala Naturae'. He also recognised two kingdoms in the living world i.e., Plantae and Animalia. The former included mainly immobile forms, while the latter embraced mobile forms. We also know that one of the major differences between the two is that the members of Kingdom Plantae are autotrophic and obtain their food mostly by photosynthetic means and those of Kingdom Animalia are heterotrophic and obtain their food by ingestion.

Table: Aristotle's 'Scale of life' or Scala Naturae.

1839_Two-Kingdom Classification.png


Kingdom Plantae was later divided by biologists into two subkingdoms,

  1. Thallophyta containing the phylum Algae (with chlorophyll) and Phylum Fungi (without chlorophyll) and
  2. Embryophyta with phylum Bryophyta (liverworts and mosses) and Phylum Tracheophyta (vascular plants).

Kingdom Animalia, on the other hand, was divided into Subkingdoms Protozoa containing unicellular forms and Sub Kingdom Metazoa including sponges and other multicellular organisms. A third Sub Kingdom Parazoa was later created and the sponges were shifted to this Sub Kingdom due to their intermediate position. between uni and multicellular organisms.


Related Discussions:- Two-kingdom classification

What are the reasons of food processing, What are the reasons of Food Proce...

What are the reasons of Food Processing? The reasons for food processing may vary, but the main objectives are to: Preserve the nutritive quality of food by preventing th

Excretion, How will the urine concentration be affected if the henle''s loo...

How will the urine concentration be affected if the henle''s loop of a person is removed and his PCT is joined directly with DCT?

Nursing assessment - anomalies of stomach and oesophagus, Nursing Assessmen...

Nursing Assessment  These children present with excessive salivation and droofing of saliva from the mouth, coughing, gagging, even choking and cyanosis at the lime of first f

Human impact on environment, questions and answers on human impacts on envi...

questions and answers on human impacts on environment

Patent ductus arteriosus , Patent Ductus Arteriosus  (PDA)   PDA is one...

Patent Ductus Arteriosus  (PDA)   PDA is one of  the most common cardiac anomalies. It occurs twice as frequently in girls as in boys.  In patent ductus Arteriosus there is

State the goals of neuropsychological assessment, State the Goals of neurop...

State the Goals of neuropsychological assessment The psychological domains/processes/ components are mediated by specific brain structures and connected brain structures formin

Explain fliylurn basidiomycetes, Fliylurn Basidiomycetes 1) The asexual...

Fliylurn Basidiomycetes 1) The asexual reproduction is by means of basidiospores which are produced on a microscopic, club-shaped basidium. 2) The basidia are found in a fru

Discuss in short about soil, Discuss in short about soil " The collecti...

Discuss in short about soil " The collection of  natural bodies in the Earth's surface, in places modified or even made by man of Earthy materials, containing living matter  an

How can the binding of two amino acids, Q. How can the binding of two amino...

Q. How can the binding of two amino acids for the peptide formation be explained? A peptide is formed when a carbon from the carboxyl group of one amino acid is connected to th

Define dietary management of sepsis with or without mods, Define Dietary Ma...

Define Dietary Management of Sepsis with or without MODS? Before we begin with the dietary management of patients suffering from sepsis with or without MODS let us read a case

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd