- Chitin
- Calcium carbonate or silica
- Cellulose
- Collagen
Category: Biology etea medical mcqs
- Amoebocytes
- Spongocytes
- Choanocytes
- Pinacocytes
- Ostium
- Osculum
- Spicule
- Cnidocyte
- Oscula
- Spicules
- Ostia
- Choanocytes
- Cellular level
- Tissue level
- Organ level
- Organ system level
- Jellyfish
- Sponges
- Corals
- Flatworms
- Mouth
- Anus
- Stomach
- Coelom
- Annelida
- Arthropoda
- Mollusca
- Echinodermata
- Blastopore forms anus
- Radial cleavage
- Indeterminate cleavage
- Blastopore forms mouth
- Cnidaria
- Porifera
- Annelida
- Mollusca
- Presence of a distinct head
- Division of the body into repeated segments
- Formation of germ layers
- Absence of a coelom
- Acoelomates
- Pseudocoelomates
- Coelomates
- Diploblasts
- Earthworm
- Tapeworm
- Roundworm
- Starfish
- Fully lined by mesoderm
- Partially lined by mesoderm
- Not lined by mesoderm at all
- Lined by endoderm
- Coelomates
- Pseudocoelomates
- Acoelomates
- Eucoelomates
- Nematoda
- Annelida
- Platyhelminthes
- Mollusca
- Pseudocoelom
- Acoelom
- Coelom
- Hemocoel
- Ectoderm, endoderm, mesoderm
- Only ectoderm and endoderm
- Ectoderm and mesoglea
- Endoderm and mesoglea
- Platyhelminthes
- Cnidaria
- Annelida
- Mollusca
