Question

Select the option that correctly matches characteristic features with the group of three animals.

• A. Skeleton of spicules - Sycon, Adamsia, Spongilla
• B. Excretion by flame cells - Taenia, Fasciola, Ancylostoma
• C. Mouth contains radula - Dentalium, Octopus, Ophiura
• D. Jointed appendages - Limulus, Apis, Laccifer

Answer 1

Answer: (D)

Jointed appendages - Limulus, Apis, Laccifer

Answer 2

In poriferans, the body is supported by a skeleton made up of spicules or spongin fibres. Sycon and Spongilla are examples of poriferans, whereas Adamsia is a coelenterate. In platyhelminths, specialised cells called flame cells help in excretion. Taenia and Fasciola are platyhelminths whereas Ancylostoma is an aschelminth. In molluscs, mouth contains a file-like rasping organ for feeding called radula. Dentalium and Octopus are molluscs whereas Ophiura is an echinoderm. Arthropods have jointed appendages. Limulus, Apis and Laccifer all three are arthropods.