Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All continents were united together in the past. Reason (R) : The Gangamopteris and Glossopteris flora have been found on all the southern continents. In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion (A) Correctness
The statement asserts that all continents were united together in the past. This is consistent with the widely accepted scientific theory of continental drift, which posits the existence of a supercontinent named Pangaea that existed approximately 335 to 175 million years ago. Therefore, Assertion (A) is considered correct.
Reason (R) Correctness
The statement claims that Gangamopteris and Glossopteris flora have been found on all the southern continents. Fossil evidence, including these specific plant types (Glossopteris flora), has indeed been discovered across South America, Africa, India, Antarctica, and Australia. This distribution is a significant piece of evidence supporting the past connection of these landmasses.
Therefore, Reason (R) is also considered correct.
Explanation Analysis
While the discovery of Gangamopteris and Glossopteris flora (Reason R) across the southern continents provides strong evidence for the past existence of Gondwanaland (a major component of the supercontinent Pangaea), it does not solely or completely explain the union of *all* continents.
The union of *all* continents into Pangaea is supported by multiple lines of evidence, including the matching shapes of continental coastlines, similar fossil distributions beyond just the southern continents, matching geological structures, and paleomagnetic data. Reason (R) specifically relates to the southern landmasses forming Gondwanaland. It supports the idea of continental union but isn't the comprehensive explanation for the unification of the entire global landmass.
Consequently, although both statements are factually correct, the evidence presented in Reason (R) is not the definitive or complete explanation for Assertion (A).
Conclusion
Both Assertion (A) and Reason (R) are correct statements. However, Reason (R) provides evidence primarily for the existence of Gondwanaland, a part of the larger supercontinent, and thus is not the complete or direct explanation for why all continents were united together.
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