Question

The echinoderm larvae is
A. Auricularia
B. Tornaria
C. Amphiblastula
D. Trochophore

Answer 1

Radial symmetry organisms known as echinoderms that have endoskeleton which is observed in the spine and calcareous. There are numerous stages in which larvae of the echinoderms pass. And each stage in which echinoderms pass is represented as a different name. Tornaria is a kind of planktonic larvae and sea cucumber is an auricularia kind of larvae.

Complete answer: In the echinoderm the bearing of the visible spine and the calcareous endoskeleton. The central disc and more than 5 radiating arms are present in the adult’s pent radial. Locomotion is produced from the water vascular system. Bilaterally symmetrical formed the larval and lost during the transition to adulthood. A pent radial symmetry part was arranged around an abdominal axis and believed to evolve from the bilateral ancestors. The classes of the Echinodermata are sea stars, brittle stars, sand dollars, sea urchins, sea cucumber, and feather stars. The digestive system of the echinoderms has an anus but nonfunctional because undigested food is expelled back from the mouth. During the mechanical stimuli, chemical, and light sources they respond. And have a dioecious reproduction system in which two sexes are indistinguishable externally released gametes.
Therefore the correct option is (A).

Note: In some sponges like amphiblastula free-living larva present in it. And in the marine annelids and with related groups of mollusks, are the type of trochophore free-swimming larvae present in it. Many diseases such as diarrhea, tuberculosis, plague, typhoid, gonorrhea, leprosy, and cholera are the numerous diseases that can be obtained from the house files commonly known as the Musca and occurred in the Echinodermata.