A sponge harmful to oyster industry is
Cliona
Euspongia
Hyalonema
Spongilla
A.
Cliona
Boring sponges, such as Cliona, attach themselves to shells of oysters, clams, barnacles etc, boring them so full of holes that their contained animals are destroyed and in time, the shells are entirely broken up. Lime of these shells gets dissolved into sea water to be used over again by other animals. Sometimes, these boring sponges may prove great nuisance to oyster beds.
During its life cycie, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stages respectively
metacercaria and ceracaria
miracidium and metacercaria
redia and miracidium
cercaria and redia
Which one of the following animals lay eggs yet the female secretes milk?
Bat
Kangaroo
Platypus
Ostrich
Gemmule formation in sponges are useful in
asexual reproduction
sexual reproduction
parthenogenesis
parthenocarpy
Sycon belongs to a group of animals which are best described as
multicellular with a gastrovascular system
multicellular having tissue organisation, but no body cavity
unicellular or acellular
multicellular without any tissue organisation
