(i) Draw a neat diagram of Hydra.

(ii) Label mesoglea and gastrovascular cavity

(iii) Name the group of animals it belongs to.

(iv) Name one species of this group that lives in colonies.

How are pteridophytes different from the phanerogams?

Explain how animals in Vertebrata are classified into further subgroups?

Describe the characteristics used in hierarchial classification of organisms.

Descibe general characters, classification and example of old division Spermatophyta.