Question

Which animal has a segmented body?
A. Mollusca
B. Annelida
C. Coelenterata
D. Porifera

Answer 1

Hint: The various segments in their body have a specialized function to perform. Without segmentation, they could lose their ability to move and would not have advanced functions. It saves them from danger. Segmented body is a distinguishing feature of this group.

Complete answer:
There is a diversity of animals and plants in this world. They have been organized into some phylum based on their features. There is a hierarchical arrangement of animals under the categories Kingdom, Phyla, Family, class etc.

Some of the phyla are-
> Option A- Mollusca: They are the soft-bodied, coelomate animals. They are bilaterally symmetrical. Their body is unsegmented. They are triploblastic and have three layers. Their body is covered by a mantle and a shell.

> Option B- Annelida: They are bilaterally symmetrical, have a coelom in their body. They have unjointed segmental extensions called parapodia in some of their species. They have a segmented body like earthworms (having segments- head, thorax and abdomen).

> Option C- Coelenterata: Most of the coelenterates are aquatic. They are diploblastic, radially symmetrical and lack coelom. Hypostomes are a single opening in their body. They have a net-like nervous system. Cnidoblasts are specialized cells in them which produce toxic substances that can paralyze their prey. They do not have segments.

> Option D- Porifera: These are one of the simplest organisms mainly aquatic and marine. They have radial symmetry and are unsegmented. They have various pores on their body called Ostia. They are hermaphrodite.

Soothe answer is option B-Annelida

Note: Other than annelids, arthropods also have a series of segmentation. This helps them to ease out the working of a complex body. Chordates have heteromeric segmentation that is having a subtle link between the segments. All segments are joint to each other.