The intermediate host of Schistosoma is

• Snail

• mosquito

• housefly

• sheep

In Mollusca, eye is present over a stalk, called

• ostracum

• operculum

• ommatophores

• osphradium

Tuberllarians are free living

• nematodes

• cestodes

• flat worms

• trematodes

The characteristic larva of Phylum- 'Coelenterata' is

• planula

• cysticercus

• rhabdiform

• wriggler

The excretory material of bony fish is

• urea

• protein

• ammonia

• amino acid

Moulting hormone is secreted by

• corpora cardacum

• corpora allata

• neurosecretory hormone

• prothoracic gland

In sea anemone, the symmetry is

• radial

• bilateral

• spherical

• absent

Solenocytes are associated with

• respiration

• digestion

• excretion

• nutrition

Connecting link between annelids and molluscs is

• Neopilina

• Peripatus

• Periplaneta

• Limulus

Shell of molluscs is derived from

• foot

• mantle

• ctenidia

• placoid