Question

In some animal groups, the body is found divided into compartments with serial repetition of at least some organs. What is this characteristic feature called?
a. Synchronization
b. Metamerism
c. Metagenesis
d. Metamorphosis

Answer 1

Hint: We know that it is true segmentation where external divisions correspond to internal divisions. Earthworm divided into compartments with serial repetition of at least some organs which represents an example of this feature.

Complete answer:
> Option A is incorrect. Synchronization is a process due to which cells are brought to the same phase, cells are at different stages of the cell cycle in a culture.

> Option B is correct. The condition of possessing or forming a linear series of body segments by an organism is defined as metamerism. Earthworm is the true example of metamerism. In vertebrates, metamerism is also observed.

> Option C is incorrect. The metagenesis is the reproduction cycle of an organism that alternates between sexual and asexual generations. We can understand the term metagenesis by the example of the reproduction cycle of cnidarians. Cnidarians also exist in polyp and medusa forms and that cnidarians show metagenesis.

> Option D is incorrect. Metamorphosis means the transformation or change in the shape. In biology, it is defined as the change in the body form and habits during the development cycles of animals. As we know that complete metamorphosis and Incomplete metamorphosis are the types of metamorphosis.

Hence, the correct answer is option (B).

Note: Metamerism is the serial repetition of organs when the body is divided into compartments. As we know that It is the linear series of body segments phenomena which is fundamentally similar in structure. It is generally seen in the phylum Annelida.