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Get Answers to all your Questions
Segmentation in the body is first observed in which of the following:
a)Platyhelminthes
b)Aschelminthes
c)Annelida
d)Arthropoda
Answers (1)
Option A: Platyhelminthes are characterized by the lack of metamerism, meaning their bodies are not segmented. As bilaterally symmetrical triploblastic organisms, examples include Tapeworms. This feature disqualifies them from being the first to exhibit segmentation.
Option B: Aschelminthes, exemplified by Roundworms, also lack segmentation. Their unsegmented nature does not indicate the phylum where segmentation was initially observed. Hence, this option is not correct.
Option C: The phylum Annelida, comprising organisms like Earthworms and Leeches, presents the earliest instance of segmentation within the animal kingdom. This characteristic is a significant feature that sets them apart. Each segment of an annelid's body, internally and externally, is structurally uniform, enhancing locomotory efficiency. Their size can increase by adding new segments, a trait that is unique to this phylum. This makes Option C the accurate choice.
Option D: Arthropoda, which comes after Annelida in taxonomic classification, indeed showcases segmentation. However, segmentation was not initially identified in this phylum. Therefore, this option is incorrect.
Hence option C is the correct answer.
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