why two kingdom classification failed
Answers
Several Objections have been raised against this two Kingdom classification. They are as following:
1) First formed organisms were neither plants nor animals.
2) Fungi differ in the structure, physiology and reproductive details from plants.
3) At the lower level of organisations there are several instances where the distinction of plants and animals actually vanish. For example, Euglena has both holophytic and holozoic nutrition and saprobic nutrition (mixotrophic nutrition or mixed form of feeding). Sponges are branched, fixed and irregular in outline just like plants. It's relatives have both holophytic and holozoic nutrition. Unicellular algae like Chlamydomonas are motile, possess regular shape, definite growth and photosynthetic organelles.
4) Groups of Unicellular algae (euglenoids, diatoms and dinoflagellates) and protozoa show sufficient degree of resemblance
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the two kingdom classification failed because of the following reasons :
1) Mushrooms,bread moulds and other members of fungi were also included in plants though they are non green and cannot synthesise their food.
2)Fungi as a group of organism differ from plants not only in lack of green colour but also in their mode of obtaining food.
3)They have filamentous structures like green algae but differ from plants in the composition of cell wall.
4)The inclusion of fungi in plant kingdom has become debatable.
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