Question

The zoological name of ‘sea lily’ is
A) Asterias
B) Antedon
C) Holothuria
D) Echinus

Answer 1

Hint: Sea lily is a crinoid marine invertebrate animal in which the adult is fixed to the sea bottom by a stalk.

Complete answer:

Fig. Sea lily

All the given animals are from the phylum Echinodermata, and all are marine with organ-system level of organization. The zoological name of ‘sea lily’ is Antedon. Antedon is also known as feather star, which is an inhabitant of the shallow water. It is a stalked form at the beginning and with the attainment of adulthood it breaks off from its stalk and swims out actively using the arms. They can also cling to the substratum by the cirri. They feed on microscopic living organisms. Other crinoids like Asterias resemble sea lilies; but they lack a stalk and can move from place to place. The stalk of sea lily is surmounted by a bulbous body with frond-like tentacles, and it resembles a plant. The common names of other organisms are Asterias (star fish), Holothuria (sea cucumbers), and Echinus (sea urchin).

So, the correct answer is Antedon.

Note: Cirri are a flattened holdfast or with whorls of jointed, root-like structures which helps the organism to attach to the substrate.