Directions : In the following questions a statement of Assertion (A) i...
A distinction between unicellular and multicellular organisms is not possible in case of algae. It is because of this unicellular green algae have not been included in kingdom Protista by Whittaker. Unicellular algae forms are placed in kingdom Protista but unicellular green algae are placed in Kingdom Plantae and not included in Protista due to their resemblance with other green algae.
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Directions : In the following questions a statement of Assertion (A) i...
Assertion and Reasoning
Assertion: Unicellular algae have not been kept in the kingdom Protista by Whittaker.
Reason: A distinction between unicellular and multicellular organisms is not possible in the case of algae.
Explanation
Whittaker is known for his five-kingdom classification system, which he proposed in 1969. The five kingdoms are Monera (bacteria), Protista (unicellular eukaryotes), Fungi, Plantae, and Animalia. However, Whittaker's system has been updated since then, and new evidence has led to changes in the classification of some organisms.
Regarding unicellular algae, Whittaker originally placed them in the kingdom Protista. However, later studies have shown that unicellular algae are not a monophyletic group, meaning they do not share a common ancestor. Instead, they are classified into several different groups, such as diatoms, dinoflagellates, and green algae. Some of these groups are more closely related to plants than to other protists.
The reason given for this assertion is that a distinction between unicellular and multicellular organisms is not possible in the case of algae. This is partly true because some algae are unicellular, while others are multicellular. However, this is not the main reason why unicellular algae have not been kept in the kingdom Protista. The real reason is the lack of a monophyletic group of unicellular algae.
Conclusion
Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion. The real reason why unicellular algae have not been kept in the kingdom Protista is the lack of a monophyletic group of unicellular algae.
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