Question

What do you understand by the term migration
A. Movement of an organism or a group of organisms.
B. Movement of natural habitat
C. Movement of an organism or a group of organisms from its natural habitat to another place at a particular time every year.
D. All of the above.

Answer 1

Hint: Migration can be compared with emigration that involves a change in location not of necessity followed by a return journey that is invasion or interruption. Both of them involve the appearance and succeeding disappearance of great numbers of animals at irregular times and locations.

Complete Answer:
- Migration is generally an annual event in which many animals travel to far-off places in search of food and breeding ground when climatic changes take place in their natural habitat. Many birds from Siberia come to India during winter months during the climate change in search of their food.
- The migration cycle is frequently annual and therefore strongly linked with the cyclic pattern of the seasons. The migration of most birds and mammals and a lot of the fishes are on a yearly cycle. In many cases animals with a comparatively long life span return back to their place of birth in order to reproduce and ultimately die. In other situations as in definite invertebrates where the animal has a relatively short life span and reproduces rapidly. Migrations will not occur in every generation.
- The daily actions of certain fishes and invertebrates have also been called migrations because of their regular incidence. This type of movement though it is not to be mystified with migration in the strict sense.

Hence the correct answer is option C.

Note: Migratory animals are fundamental components of the ecosystems that support all life on Earth. By performing the function as pollinators and seed distributors they contribute to ecosystem structure and function. They supply food for other animals and regulate the number of species in ecosystems.