Question

Veliger larva occurs in which of the following phylum
A. MOLLUSCA
B. ECHINODERMATA
C. ARTHROPODA
D. CNIDARIA

Answer 1

Hint:
A veliger form of the larvae is the planktonic larvae of sea snails as well as freshwater snails. These types of larvae are also found in most bivalve molluscs along with tusk shells. It is the main characteristic of larva found in mollusca, gastropods, scaphopods and bivalves. They develop the following trochophore larval stage and further develop to form pediveliger larvae.

Complete answer:
> OPTION-A- MOLLUSCA
Mollusca are the second-largest phylum of invertebrate species after the Arthropods. The members of this family are known as molluscs or mollusks. Around 85,000 extant species of mollusca are recognized till date. The numbers of fossils of these species are estimated between 60,000 and 100,000 additional species.
> OPTION-B- ECHINODERMATA
Echinodermarta species are named owing to their spiny skin as well as this phylum is a collection of about 7,000 described living species in today’s time. Echinodermarta species are exclusively marine organisms.
> OPTION-C-ARTHROPODA
An arthropod is an invertebrate species having an exoskeleton, a segmented body, as well as paired jointed appendages. Arthropods from the phylum Euarthropoda, which includes insects, arachnids, myriapods, and crustaceans.
> OPTION-D-CNIDARIA
Cnidaria is a phylum under the kingdom of Animalia which includes over 11,000 species of aquatic animals found both in freshwater as well as marine environments: they are predominantly marine.

So, the correct answer is option A.

Note:
ANDi is the name of the first genetically modified rhesus monkey. He was born at Oregon Health Sciences University on October 2, 2000. He was given this by OHSU because ANDi stands for iDNA spelled backward.