What is true about the isolated small tribal populations?

Select the correct option with respect to the given age pyramids.

Which of the following is not a part/component of population attributes?

Read the following statements and choose the option with all the correct statements only :
$(A)$ The size of a population for any species is not a static parameter.
$(B)$ Total number is always the most appropriate measure of population density because in all cases it is most meaningful and easy to determine.
$(C)$ $A$ population growing in a habitat with unlimited resources shows initially a lag phase followed by phases of acceleration and deceleration and finally an asymptote.
$(D)$ According to ecologists,life history traits of organisms have evolved in relation to the constraints imposed by the abiotic and biotic components of the habitat in which they live.
Choose the correct answer from the options given below :

Under a particular set of selection pressure,organisms evolve towards the most efficient reproductive strategy. For example:
$A$) Oysters produce a large number of small-sized offspring.
$B$) Mammals produce a small number of large-sized offspring.
In the light of the above statements,choose the correct option.

The following figure shows the age pyramids for human populations. What types of populations are represented by $P$,$Q$,and $R$?
$P \quad\quad Q \quad\quad R$