Q. Read the following statements.
I. In a population, birth rate and death rate refer to per capita births and deaths, respectively.
II. In nature, we rarely find isolated single individuals of any species.
III. The size of population for any species is stable phenomena.
IV. Ecological effects of any factors on a population growth are generally reflected in its size/population density.
Choose the correct statements.

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Solution:

Statements I, II and IV are correct. Statement III is incorrect and can be corrected as
Size of population keeps on changing due to various factors or phenomena like birth rate, death rate, emigration or immigration. So, it is a dynamic phenomena rather than stable.