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 appendage	Limulus, Apis, Laccifer

Answer 1

The correct option is: (d) Jointed appendage - Limulus, Apis, Laccifer

Explanation:

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.