Question

Metameric segmentation is the characteristic of –
A. Platyhelminthes and Arthropoda
B. Echinodermata and Annelida
C. Annelida and Arthropoda
D. Mollusca and Chordata

Answer 1

Metameric segmentation is the repetition of organs and tissues at intervals along the body of an animal, thus dividing the body into a linear series of similar parts or segments (metameres). It is more advanced over ciliary or creeping movement found in lower invertebrates.

Complete answer:
Metameric segmentation is an internal, mesodermal phenomenon, the body musculature and coelom being the primary segmental divisions. This internal segmentation imposes a corresponding segmentation on the nerves, blood vessels, and excretory organs.
In some metameric animals, the segmentation is visible externally but in others (e.g. Chordata) external segmentation has been lost and internal segmentation is best seen in the embryo. Metameric segmentation is thought to have arisen as an adaptation to more efficient locomotion. Metameric segmentation is most strongly marked in annelid worms (e.g. earthworms), in which the muscles, blood vessels, nerves, etc. are repeated in each segment.
In annelid, the segmentation is obvious both externally and internally. It also occurs internally in arthropods.
So, the answer is C, i.e., Annelida and Arthropoda

Note: In the embryonic development of all vertebrates, in which metameric segmentation is confined to parts of the muscular, skeletal, and nervous systems and does not show externally. The function of metameric segmentation is the coordination of muscle contraction and the fluid-filled coelomic cavity makes swimming and locomotion movement more efficient.