Question

In which one of the following, the genus name, its two characters and its phylum are not correctly matched?

Genus name	Characters	Phylum
A) Pila	i)Body segmentedii)Mouth with radula	Mollusca
B) Asterias	i)Spiny skinnedii)Water vascular system	Echinodermata
C) Sycon	i)Pore bearing ii) Canal system	Porifera
D) Periplaneta	i)Jointed appendagesii)chitinous exoskeleton	Arthropoda

Answer 1

Hint: Segmentation in biology is the division into a sequence of repeated divisions in certain animal and plant body plans. To allow free movement and development of certain body parts, segmentation of the body plan is essential. In specific individuals, it also allows for regeneration.

Complete answer:
Pila is a member of Phylum Mollusca, a body which is unsegmented. It also has a rasping organ called radula for feeding purposes. The characters of Pila are as follows:
Pila is an animal with a fluffy body wrapped in a shell.
The shell is spirally coiled about an axis called the columella and the mouth or aperture opens outside.
The operculum is well formed and close to the shell's aperture or mouth.
The soft body is made up of shoulders, foot, and visceral mass.

In zoology, a linear series of repeated parts are constructed, each being a metamere (body segment, or somite) and each being produced in the embryo in order, from anterior to posterior. They are also metameric members of three large animal phyla: Annelida, Arthropoda, and Chordata.

Note: The kingdom Animalia is classified on the basis of - the basis of the organization (cell/tissue/organ/organ system), body symmetry, germinal layers, coelom character, segmentation and notochord.