Question

The characteristics larva of phylum ‘Coelenterata’ is
a. Planula
b. Cysticercus
c. Rhabdiform
d. Wriggler

Answer 1

Hint: The group of aquatic, marine organisms and a member of the animal kingdom is called phylum Coelenterata. Usually, they are attached to the rocks present at the bottom of the sea. They are one of the simplest invertebrate groups of animals and are multicellular. They are mainly found in colonies and solitarily.

Complete answer:
> Option A: The free-living or crawling larvae type is called Planula. It is commonly found in most of the Coelenterata species. The shape of the planula body is cylindrical or egg-shaped. There are numerous cilia present on the body of the planula which is used for the process of locomotion. The production of planulae occurs by the polyp in sea anemones and other anthozoans and also by medusa in most cnidarians. The mode of reproduction of planula is sexual and asexual (by budding).

> Option B: The scientific name of young tapeworms is Cysticercus and it belongs to the Taenia genus. It is a vesicle that is small, sac-like that consists of a bladder and also called bladder worm. When the intermediate host ingests the eggs then this will develop like pigs and cattle. Muscles in the region wherein humans are settling down.

> Option C: The characteristic of rhabditid is referred to as rhabdiform. It is the main causal agent of strongyloidiasis in humans. It is a type of roundworm. The larva of rhabditiform becomes an infective filariform in the gut that either penetrates the intestinal mucosa or skin of the perineal area.

> Option D: The larva of mosquito which is aquatic and consists of a large head and thorax is called wrigglers. The abdomen is worm-like and the water surface is the main place where they typically hang.

Hence, the correct answer is option (A).

Note: Coelenterata consists of marine organisms whose body is radially symmetrical and shows tissue-level organization. Different species of Coelenterata have different features. There are sensory tentacles that surround their mouth and help to capture prey. The poison which is released by the Coelenterata mouth is very harmful and deadly.