EVERYDAY SCIENCE

Detailed explanation-1: -Cnidarians are radially symmetrical and they contain a mouth located at the center of the body. This is surrounded by many tentacles that can extend forward and outward of the organism’s body. They have two different forms in their life cycle–polyp or medusa.

Detailed explanation-2: -What Is a Cnidarian? Cnidarians are soft-bodied, carnivorous animals that have stinging tentacles arranged in circles around their mouths. They are the simplest animals to have body symmetry and specialized tissues.

Detailed explanation-3: -Cnidarians are soft-bodied animals that include corals, jellyfish, and sea anemones. These soft-bodied animals have saclike digestive cavities and tentacles containing rows or stinging cells used for defense and capture of food.

Detailed explanation-4: -Cnidarians mostly have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single orifice and body cavity that are used for digestion and respiration.

Detailed explanation-5: -Cnidarians are radially symmetrical (i.e., similar parts are arranged symmetrically around a central axis). They lack cephalization (concentration of sensory organs in a head), their bodies have two cell layers rather than the three of so-called higher animals, and the saclike coelenteron has one opening (the mouth).