Organisms of ____________________ phylum have cellular level of organization of the body.

Aschelminthes are called as the roundworms because _________ .

The chitinous projections, found in the members of phylum Annelida are called as  _________________.

The digestive system in case of flatworms is _______________.

Presence of tube feet is the characteristic feature of _______________ phylum.

Two types of Cnidarian are ________________.

Hydra belong to

Name the phylum which includes organisms having -

(i) coelom ,

(ii) Body elongated, vermiform and cylindrical,

(iii) Body is divided into segments by ring - like grooves

Cockroaches respire through

Which of the following infectious agents are not given any position in the classification system ?