Question

describe polymorphism in hydrozoa​

Answer 1

Explanation:

The occurrence of more than one type of structurally and functionally different individuals within a population is called polymorphism. The class Hydrozoa of phylum Coelenterata includes a large number of colonial species that contain more than one form of individuals which are called zooids.

Answer 2

Polymorphism is the existence of multiple types of structurally and functionally different individuals within a population.

• The Class Hydrozoa under the phylum Coelenterata contains a great number of colonial organisms that have many forms of individuals, known as zooids.

• Polyps and medusa are two forms of coelenterates that exist in single or colonial.
• Polyp (plural):
• Polyps in Hydrozoa have a tubular body with a mouth at one end encircled by tentacles.
• Another end is blind and is normally joined to the substratum by the pedal disc.
• Polyps are usually sessile and reproduce in an asexual manner.
• Medusa:
• Medusa has a bowl or umbrella-shaped body with peripheral tentacles and a mouth centrally situated on the manubrium(a projection) of the lowest concave surface in Hydrozoa.
• Medusas are motile and mode of reproduction is sexual.
• It is necessary for the division of work among zooids, as different shapes are allocated distinct duties.