Question

Identify a polymorphic coelenterate.
a. Physalia
b. Fungia
c. Hydra
d. All of the above

Answer 1

Hint: The marvel of the event of a person in at least two particular morphological and utilitarian structures. It happens in similar types of people. It is otherwise called hereditary polymorphism. For instance, various people of animal types may stay independent as spoken to by different ranks in termites, ants and Cuban snails.

Complete answer:
• Polymorphism is a significant element of phylum coelenterata.
• Every individual from Coelenterates is known as Zooid and they frequently units to frame a settlement which goes about as a solitary unit (person).
• Physalia is a genus of the order Siphonophora, colonies of 4 specialised polyps and medusoids that waft on the surface of the Atlantic, Indian and Pacific oceans.
• A gas-stuffed bladder such as a blue bottle presents buoyancy in physalia, and long tentacles of venomous cnidocytes offer a method of capturing prey.
• A sail at the float, which may be left or proper-handed, propels Physalia about the ocean, often in agencies.
• Individuals once in a while become stranded on beaches, where their poisonous nematocysts can continue to be amazing for weeks or months in moist situations.
• Polymorphic forms in Coelenterata are of two types of zooids which may be single or colonial.

• They exist in two forms- polyps and medusa.
- Polyp: In Hydrozoa, polyps have a cylindrical body with a mouth encompassed by appendages toward one side.
- Medusa: In Hydrozoa, medusa has a bowl or umbrella moulded body with minimal appendages and mouth midway situated on a projection called manubrium of the lower sunken surface. Medusas are commonly motile, they recreate explicitly.

Hence, the correct answer is option (A).

Note: Polymorphism holds major importance, it is essential for division of labour among the individual zooids. Different functions are assigned to different forms for consideration polyps are concerned with the feeding, protection and asexual reproduction whereas medusa is concerned with sexual reproduction same occurs with the Physalia species of organisms.