Question

Population dispersion can be defined as
a. Movement from one place to another and immigration again
b. Spatial distribution of individuals
c. Migration from a natal site
d. Random mixing of two populations

Answer 1

Hint: A basic characteristic feature of the population is dispersion, It controls the various factors such as structure and organization and at the same time, it majorly determines the density of the population, which means the individuals present per unit area or per unit volume.

Complete answer:
- Usually, under the natural condition, organisms are normally moved by either active or passive movements.
- Sometimes it might be due to some passive movements such as by water, or by wind, or by any other way.
- Mainly the population dispersion or distribution deals with the spatial arrangement of the individuals within the habitat.

Individuals of population, majorly dispersed in three basic types, they are:
- Uniform dispersion where the individuals are uniformly placed or uniformly spaced apart.
- In random dispersion, the individuals are spaced in an uneven pattern like without any proper measurements.
- In clumped dispersion, the individuals are generally clumped or grouped together.
- Dispersion is also affected by the time of the day or month or season of the individuals, this is mainly seen in the migrating population.
- At the same time, dispersion is also affected by the relationship between the species and their nutrients.

For example, if there is any competition regarding the food between the species which depend on the same food, where after some time one of the species is eliminated.

Hence, The correct answer is option (B).

Note: Among the plants and animals, most of the dispersion usually takes place at the time of reproduction, where the movement of an organism occurs from the birthplace to the place where the breeding occurs, this all causes the spatial arrangement of individuals.