Biology XI

Phylum : Porifera

Phylum : Porifera
Porifera has been derived from 2 Greek words. Poros ? pure and ferre ? to bear Important characters:

Their body

Phylum: Platyhelminthes

Phylum: Platyhelminthes
Made up of two Greek words ? Platys =flat &helmins =worms

Body form: They have dorsoventrally flattened body so often called as

Phylum : Annelida

Phylum : Annelida
From Latin words; annulus = ring + eidos = form

Habit and Habitat: They are mostly aquatic, found in sea

Fruit

It is the ripened ovary which encloses seeds and generally formed after fertilization. Sometimes fruit may develop without fertilization. Such fruit

Differernce of Prokaryotic cells & Eukaryotic cells

Prokaryotic cells:          

The nucleus lacks nuclear membrane, nucleolus and nuclear nucleoplasm.
DNA