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What is 2 kingdom classification?

What are drawbacks of 2 kingdom classification?

Two Kingdom Classification

 

The natural system of classification has been subjected to periodic reviewing as a result of the continuous input of information and new scientific tools being available on various aspects of living organisms. Various schemes of classification are now available, each having certain merits and demerits. One of the earliest scheme of natural system classification is the two-kingdom classification proposed byCarolus Linnaeus in 1758.

Drawbacks of two kingdom classification-

  • There was no distinction between eukaryotes and prokaryotes. For example- bacteria which lack nuclear envelope & cytoplasmic organelles but still they are placed in kingdom plantae.
  • It kept photosynthetic and non photosynthetic organism together in plant kingdom. For example- Fungi which lack chlorophyll and are saprotrophic still placed in kingdom plantae.
  • There are some organism which neither fall into plant or animal kingdom, like lichens.
  • There are some organisms which have the characters of both plants & animals like euglena, chlamydomonas so can be placed in any kingdom.
  • Unicellular plants like diatoms and animals like protozoans which have same level of organization and reproduce by fission but they are placed in different knigdoms.

 

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Two Kingdom Classification:
Carolus Linnaeus placed all the living organisms in two major kingdoms Kingdom Plantae for plants and Kingdom Animalia for animals. This classification was quite reasonable at that period of time since plants and animals could be very clearly distinguished. Plants were stationary, fixed to the soil, absorbed water for growth and could prepare their own food. Animals, on the other hand were capable of movement, and were feeding on plants and other animals for their growth and survival. Apart from this a few other significant differences, particularly at the level of cells, were established between plants and animals by scientists of the later period.
Drawbacks:
The two-kingdom classification received considerable recognition from biologists and was in use for quite a long period of time. However, as more and more information started emerging on the various groups of plants and animals, this system of classification was found to be inadequate. Studies made on the lower forms of life in particular, revealed an enormous variation of characteristics in those forms, not in agreement with the characteristics of the group in which they were placed.
The two kingdom classification has certain demerits such as:

There is no clear-cut distinction in the lower forms of life, into plants and animals.
Euglena for example is a unicellular organism having certain features of animals and certain features of plants. It has a flagellum which is used for locomotion and food capturing. However, it has chloroplasts like plant cells.

Chlamydomonos is a unicellular alga. It is purely autotrophic but has a locomotor structures called flagella, like protozoans.
Slime moulds are a type of fungi. They do not have a cell wall in the vegetative phase and ingest particulate matter like animals. However, they develop a cell wall in the reproductive phase which is similar to other fungi.
Thus, they resemble animals in one phase and plants in the other.
SpongesBack to Top
are sessile, irregular animals which look like plants.
diatomsBack to Top
There are organisms like (plants) and protozoans (animals) which share a number of common characteristics and organization.
FungiBack to Top
differ from plants in several features. They do not have chlorophyll and they are saprotrophic in nature.
It is presumed that when life first evolved on the earth it was neither in the plant form or in the animal form. Definite plant or animal status is said to have been attained much later in the evolutionary history.
Lichens are not given an appropriate place. It represents an example of symbiotic relationship between algae and fungi.
In view of all these considerations, the two kingdom classification had to be revised. One of the earliest attempt in this direction was that of Earnst Haeckel in 1868. He proposed a three-kingdom classification in which he suggested the creation of a new kingdom Protista to include all the unicellular organisms, both from plants and animals.

The advent of electron microscope opened up newer situations. The discovery of prokaryotic and eukaryotic conditions in the cell made the scientists to list the organisms that showed these kinds of cells. The blue-green algae among algae and the bacteria which were earlier placed in the group Thallophyta, were found to contain prokaryotic cells. All other algae, fungi, protozoans and multicellular animals were found to be composed of eukaryotic cells. Copeland suggested in 1966, the erection of a new kingdom called Monera to include all the prokaryotic organisms. This led to the practice of a four-kingdom classification - Kingdoms Monera, Protista, Metaphyta (all advanced eukaryotic plants) and Metazoa (all advanced eukaryotic animals).
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The natural system of classification has been subjected to periodic reviewing as a result of the continuous input of information and new scientific tools being available on various aspects of living organisms. Various schemes of classification are now available, each having certain merits and demerits. One of the earliest scheme of natural system classification is the two-kingdom classification proposed by Carolus Linnaeus in 1758.

Drawbacks of two kingdom classification are:-

There was no distinction between eukaryotes and prokaryotes. For example- bacteria which lack nuclear envelope & cytoplasmic organelles but still they are placed in kingdom plantae.
It kept photosynthetic and non photosynthetic organism together in plant kingdom. For example- Fungi which lack chlorophyll and are saprotrophic still placed in kingdom plantae.
There are some organism which neither fall into plant or animal kingdom, like lichens.
There are some organisms which have the characters of both plants & animals like euglena, chlamydomonas so can be placed in any kingdom.
Unicellular plants like diatoms and animals like protozoans which have same level of organization and reproduce by fission but they are placed in different knigdoms.

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Two Kingdom Classification

 

The natural system of classification has been subjected to periodic reviewing as a result of the continuous input of information and new scientific tools being available on various aspects of living organisms. Various schemes of classification are now available, each having certain merits and demerits. One of the earliest scheme of natural system classification is the two-kingdom classification proposed by Carolus Linnaeus in 1758.

Drawbacks of two kingdom classification-

  • There was no distinction between eukaryotes and prokaryotes. For example- bacteria which lack nuclear envelope & cytoplasmic organelles but still they are placed in kingdom plantae.
  • It kept photosynthetic and non photosynthetic organism together in plant kingdom. For example- Fungi which lack chlorophyll and are saprotrophic still placed in kingdom plantae.
  • There are some organism which neither fall into plant or animal kingdom, like lichens.
  • There are some organisms which have the characters of both plants & animals like euglena, chlamydomonas so can be placed in any kingdom.
  • Unicellular plants like diatoms and animals like protozoans which have same level of organization and reproduce by fission but they are placed in different knigdoms.

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..............

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omg! people have been taking answers from the net instead of answering it on their own!! @_@!

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Wud u type such a big answer sam .srslr..??!!

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0.o ..nope.but still.it's better to answer questions on your own than COPYING it from the net!

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 DON"T ANGRY ME 

SUMRAH..

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The natural system of classification has been subjected to periodic reviewing as a result of the continuous input of information and new scientific tools being available on various aspects of living organisms. Various schemes of classification are now available, each having certain merits and demerits. One of the earliest scheme of natural system classification is the two-kingdom classification proposed by Carolus Linnaeus in 1758.

Drawbacks of two kingdom classification are:-

There was no distinction between eukaryotes and prokaryotes. For example- bacteria which lack nuclear envelope & cytoplasmic organelles but still they are placed in kingdom plantae.
It kept photosynthetic and non photosynthetic organism together in plant kingdom. For example- Fungi which lack chlorophyll and are saprotrophic still placed in kingdom plantae.
There are some organism which neither fall into plant or animal kingdom, like lichens.
There are some organisms which have the characters of both plants & animals like euglena, chlamydomonas so can be placed in any kingdom.
Unicellular plants like diatoms and animals like protozoans which have same level of organization and reproduce by fission but they are placed in different knigdoms.

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Uff....why is everyone giving the same answer??? Are u guys copying each others answer and just pasting????
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Carlous linenous proposed two kingdom classification system first time.he divided all living organisms in two kingdoms plantae and animilia.the organisms which can prepare their own food are placed in kingdom plantar and the organisms which can,t prepare their own food and depend on other plants and animals are placed in kingdom animilia.algae bacteria and fungi are also placed in kingdom plantae.some taxonomies found this system unworkable because some organisms having both plant like and animal like characters like EUGLENA is placed in kingdom plantae.taxonomists think that there should be a separate kingdom for such organisms.this system ignores the difference between organisms having prokaryotic cells and organisms having eukaryotic cell.
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I don't know
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its to big
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2 kingdom classification is the classification of all living organisms into Kingdom Plantae and Kingdom Animalia. this was first given by linnaeus. 
The drawbacks are as follows:
  • we cant say that bacteria and fungi are plants as they don't have chlorophyll.
  • euglena and chlamydomonas cant be regarded as a plant or animal.

 
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All is well
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Adrish has typed not copied from net😇😇😇😇
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