Question

most animals have a larval stage? true/false

cnidarians have two main body plans: a polyp and a medusa form. T/F?

Answer 1

Ans 1. true

A larva is a distinct juvenile form almost animals undergo before metamorphosis into adults. Almost animals with indirect development some of these are insects ( about 90% possess larva stage), amphibians, or cnidarians and marine animals typically have a larval phase of their life cycle.

Ans 2. true

Animals in this phylum show two distinct morphological body plans: polyp (stalk) and medusa (bell).

Polyp forms are sessile as adults, with a single opening to the digestive system (the mouth) with tentacles surrounding it.

Example :-Hydra spp

Medusa forms are motile, with the mouth and tentacles hanging down from an umbrella-shaped bell.

Example :- jellyfish