ANIMAL KINGDOM Part-9, NCERT Class-11
Phylum - Ctenophora • Commonly known as Sea - walnut or Comb - Jellies . • Ctenophores are exclusively marine • Radially Symmetrical, Diploblastic . • Ctenophores exhibit Tissue level of body organisation. • Their body possess eight external rows of ciliated COMB PLATE (Hepls in Locomotion ) • Intracellular and Extracellular digestion seen. • Ctenophora phylum's well marked property is BIOLUMINESCENCE (Living organism's light emitting feature) • Hermaphrodite • Reproduction in only sexual mode • External fertilization with Indirect development. Example: • Pleurobrachia • Ctenoplana