Assertion : Metamerism is the characteristic of annelida
Reason : Metamerism is one type of body segmentation

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

B

Explanation

The body of annelids is divided into segments called metameres, externally by ring like grooves (annuli) and internally by vertical partitions called septa. The external segmentation corresponds to internal segmentation. This phenomenon is called metameric segmentation. Phylum Annelida represents the first group of metazoan animals developing a true coelom with true metameric segmentation.