Give the main features of coelenterates.
- Diploblastic animals with tissue level organisation in the body.
- The body is radially symmetrical.
- The body bears tentacles supplied with special stinging cells called cnidoblasts.
- There is a cavity in the body.
- Body is made of two layers of cells.
- Simple gonads without gonoducts are present.
- Reproduction is usually asexual (budding) in polyp form and sexual in medusae form.
- They show polymorphism.
Examples: Hydra, Obelia and jelly fish.