Fresh water sponge is the common name of
(1) Hydra
(2) Sycon
(3) Spongilla
(4) Euspongia
Collar cells are present in the members of which phyla
1. Echinodermata
2. Coelenterata
3. Ctenophora
4. Porifera
Fragmentation is a method of asexual repoduction in
(1) Annelida
(2) Platyhelminthes
(3) Aschelminthes
(4) Porifera
Eggs and Sperm are produced by the same individual in case of
(1) Leech
(2) Sponges
(3) Pleurobrachia
(4) All of the above
The digestive system in Meandrina is
(1) Digestion is extracellular only
(2) Digestion is intracellular only
(3) Digestion is both extracellular and intracellular
(4) Digestion absent as it is a parasite
Both polyp and medusa life forms are present in the life cycle of
(1) Obelia
(2) Physalia
(3) Aurelia
(4) Adamsia
The skeleton of corals is made up of
(1) Calcium silicate
(2) Calcium phosphate
(3) Hydroxyapatite
(4) Calcium carbonate
Which of the following group consists exclusively of cnidarians?
(1) Aplysia, Gorgonia, Spongilla, Hydra
(2) Hydra, pennatula, obelia, Echinus
(3) Hydra, obelia, adamsia, physalia
(4) Scypha, Hydra, adamsia, physalia
Ctenophora is an exclusively marine phylum, the other such phylum is
(1) Mollusca
(2) Echinodermata
(3) Porifera
(4) Coelenterata
Ctenophorans are commonly referred to as
(1) Flatworms
(2) Comb jellies
(3) Sea anemone
(4) Cnidaria