Biological Classification - Two Kingdom
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Description:
Linnaeus also known as the father of taxonomy formulated the two kingdom classification. According to this system, organisms had been classified into two groups plants and animals mainly on the basis of presence or absence of cell wall.
The characters which were considered while grouping into two kingdoms are as follows −
| Plants | Animals |
|---|---|
| Presence of cell wall. | Absence of cell wall. |
| Occurrence of inorganic crystals in the cells. | Inorganic crystals not present in cells. |
| Presence of central vacuole in the cell. | Absence of central vacuole in the cell. |
| Absence of sensory organs, excretory organs and nervous system. | Presence of sensory organ, excretory organs and nervous system. |
| Ability to manufacture food due to presence of chlorophyll. | Inability to manufacture food due to absence of chlorophyll. |
| Stored food is starch. | Stored food is glycogen. |
Objections of two kingdom classification
- First formed organisms were neither plants nor animals.
- Fungi differ in structure, physiology and reproductive details from plants.
- Lichens are a peculiar group of dual organisms which are formed by association between an alga and a fungus.
- At lower levels of organization difference between plants and animals disappears.
- Prokaryotes were not considered separately.
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