Question

Highest degree of polymorphism is found in
A. Protozoa
B. Cnidaria
C. Platyhelminthes
D. Arthropoda

Answer 1

Hint: Polymorphism occurs when a species' population contains two or more diverse morphs or morphologies. Alternative phenotypes is another name for it. These morphs must share the same habitat at the same time and be part of a panmictic population, which means that the likelihood of any particular male and female occurring in the same population is the same for all individuals.

Complete answer:
Option A: Polymorphism in Protozoa can be classified into three categories based on the three main causes of polymorphism: first, polymorphism due to adaptation to different living conditions; second, polymorphism due to differences in size and structure during growth; and third, polymorphism due to individual differentiation during the syngamy process.
So option A is not correct.
Option B: The appearance of various morphological forms is known as polymorphism. It's typical in the phylum Coelenterata, which has both an asexually reproducing polyp and a sexually reproducing medusae stage. The life cycles of Cnidaria members alternate between two forms:Polyps (usually sessile, with a vase-shaped body) that are nourishing in purpose; and sexual, free-swimming forms known as medusae (singular medusa, with a bell-shaped body) that are reproductive in function.
So option B is correct.
Option C: Polymorphism is the occurrence of several morphological forms. It's common in the phylum Coelenterata, which has both asexually and sexually reproducing polyps and medusae stages. Cnidaria members' life cycles alternate between two types: feeding polyps and sexual, free-swimming forms known as medusae, which are reproductive in nature.
So option C is not correct.
Option D: In the insect order Lepidoptera, there are many different types of polymorphism. Within a single species, polymorphism refers to the appearance of forms or "morphs" that differ in colour and number of features.
So option D is not correct.

So option B is the correct answer.

Note:
The process known as alternation of generations occurs when members of the phylum Cnidaria subsist by flipping between polyp and medusa forms. The asexual form is the polyp, whereas the sexual form is the medusa. Class hydrozoa belongs to the phylum Cnidaria and demonstrates alternation of generation. Metagenesis is another name for this phenomenon.