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

Show the process of synaptic transmission, Q. Fluoxetine is an antidepressa...

Q. Fluoxetine is an antidepressant drug that presents an action mechanism related to the synaptic transmission. What is that mechanism? Fluoxetine is a substance that inhibits

Explain different amino acids found in proteins, How many different protein...

How many different proteins, each composed of 8 amino acids, can be constructed using the 20 different amino acids found in proteins?

Birth of genetics, REDISCOVERY OF MENDEL'S LAWS (THE BIRTH OF GENETICS) ...

REDISCOVERY OF MENDEL'S LAWS (THE BIRTH OF GENETICS) 1.         It was in 1900 that three botanist independently rediscovered the principles of heredity already worked out by M

Define some caution for inoculating loops and needles, Define Some Caution ...

Define Some Caution for Inoculating Loops and Needles? 1. Heat the inoculating wire till it becomes red hot. 2. Never use hot inoculating wire for culturing otherwise cells

Why should posterior wall preffered during surgery, Why should Posterior wa...

Why should Posterior wall preffered during surgery Posterior wall should not be perforated during surgery. This limits bleeding from the pterygoid plexus or branches of the max

Explain in brief about leukotrienes and prostaglandins, Leukotrienes and pr...

Leukotrienes and prostaglandins are produced only when the mast cell undergo degranulation and enzymatic break down of phospholipids in the plasma membrane. The effects formed b

Explain atrial pressure, Q. Explain Atrial Pressure? The RA pressure wa...

Q. Explain Atrial Pressure? The RA pressure wave form has three positive deflections - "a", "c", and "v" waves. The "a" wave is due to atrial systole and follows the P-wave on

Explain the potential benefits of micro nutrients, Explain the Potential Be...

Explain the Potential Benefits of micro nutrients? The potential benefits of micro nutrients should also be taken into account when the nutrient allowances are defined for olde

Agro industrial-oil seed meals as by-pass protein source, Oil Seed Meals as...

Oil Seed Meals as By-pass Protein Source The protein digestion in ruminants encompasses microbial transformation of dietary protein in the rumin. A varying portion of feed pro

Argument, do you can write argument i will send you the article you want wr...

do you can write argument i will send you the article you want write from with rules please call me at 623-552-8532

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