Question

As per classification which of the following is correct?
A. Ascaris , Pheretima , grasshopper
B. Hydra , Pterido , Leucosolenia
C. Starfish, grasshopper, salmon
D. Pila , Dentalium , Octopus

Answer 1

The mechanism by which scientists group living organisms is called biological classification. Based on how similar they are, species are categorized. Similarity has traditionally been determined by analyzing an organism's physical features, but modern classification uses a number of approaches, including genetic analysis.

Complete answer: Classification is the categorization of organisms. Mollusca is the second-largest phylum of invertebrate species after Arthropoda. Members are referred to as molluscs or molluscs. The mantle of the genus Dentalium is completely inside the shell. The foot stretches and is used to burrow into the substrate from the greater end of the shell. In the substrate, they put their head down, the apical end of the shell (at the back of the body of the animal) extending up into the water. Ascaris is a nematode, Pheretima is an annelid, while the arthropod is a grasshopper. Hydra belongs to the Cnidaria phylum, while Pteridophyte is a plant phylum, while Leucosolenia is a sponge. The phylum Echinodermata refers to Starfish, while Grasshopper is an arthropod while Salmon is a chordate. Therefore, in choices A, B and C, species do not have the same grouping and Pila , Dentalium and octopus belong to the phylum Mollusca.
So, option D is the correct answer.

Note: A mantle with a significant cavity is used for breathing and excretion, the presence of a radula (except for bivalves), and the structure of the nervous system are the three most universal characteristics distinguishing modern molluscs. Molluscs express great morphological diversity other than these common elements.