Polymorphism in siphonophora

Among siphonophores polymorphism found in highest grade.

1. Polymorphism in Siphonophora Md Ekramuddin

2. Siphonophora-hydrozoan Order

3. Pennatularia sp

4. Velella sp

5. Physalia sp

6. Questions What is polymorphism?Why this is developed among the siphonophores ? Define polymorphism. Write down different polymorphic forms of Polyp/Medusa among the siphonophores ? Write note on- cormidium , siphonoglyph , tasters, bract, pneumatophore , trichter , gonophore,swimming bell, difference between caste and zooid.

7. Thank you