Population Questions

The age-sex structure of human population in countries like France and Germany gives a steep pyramid.

Geometric representation of age structure is a characteristic of:

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty years apart. Select the correct interpretation:

Interpretations:
1) "B" is earlier pyramid and shows stabilised growth rate.
2) "B" is more recent showing that population is very young.
3) "A" is the earlier pyramid and no change has occurred in the growth rate.
4) "A" is more recent and shows slight reduction in the growth rate.

The logistic population growth is expressed by the equation:

Consider the following statement $(A)\text{–}(D)$ with blanks. Which option gives the correct fill ups?$(A)$ Bears go into $(1)$ during winter to $(2)$ cold weather.$(B)$ A conical age pyramid with a broad base represents $(3)$ human population.$(C)$ A wasp pollinating a fig flower is an example of $(4)$.$(D)$ An area with high levels of species richness is known as $(5)$.

A biologist studies a population of rats. Natality = 250, Mortality = 240, Immigration = 20, Emigration = 30. The net increase in population is: