Question

Match the following genera with their respective phylum.

$\begin{array}{cccc}\text{(1)}& Ophiura& \text{(i)}& \text{Mollusca}\\ \text{(2)}& Physalia& \text{(ii)}& \text{Platyhelminthes}\\ \text{(3)}& Pinctada& \text{(iii)}& \text{Echinodermata}\\ \text{(4)}& Planaria& \text{(iv)}& \text{Coelenterata}\\ & & & \text{substance}\end{array}$

• A. (1)-(iv), (2)-(i), (3)-(iii), (4)-(ii)
• B. (1)-(iii), (2)-(iv), (3)-(i), (4)-(ii)
• C. (1)-(i), (2)-(iii), (3)-(iv), (4)-(ii)
• D. (1)-(iii), (2)-(iv), (3)-(ii), (4)-(i)

Answer 1

The correct option is B (1)-(iii), (2)-(iv), (3)-(i), (4)-(ii)

Ophiura belong to phylum echinodermata. These animals have an endoskeleton of calcareous ossicles and, hence, the name Echinodermata (spiny bodied). All are marine with organ-system level of organisation. The adult echinoderms are radially symmetrical but larvae are bilaterally symmetrical. They are triploblastic and coelomate animals.

Physalia (Portuguese man of war) belong from phylum coelenterata. They are aquatic, mostly marine, sessile or free-swimming, radially symmetrical animals. The name Cnidaria is derived from the cnidoblasts or cnidocytes (which contain stinging capsules or nematocytes) present on the tentacles and the body. Cnidoblasts are used for anchorage, defense and for the capture of prey. Cnidarians exhibit tissue level of organisation and are diploblastic.

Pinctada (pearl oyster) belongs to phylum mollusca. This is the second largest animal phylum. Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation. They are bilaterally symmetrical, triploblastic and coelomate animals.

Planaria which possess high regeneration capacity belongs to from phylum platyhelminthes. They have dorso-ventrally flattened body, hence are called flatworms. These are mostly endoparasites found in animals including human beings. Flatworms are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation.