The equation $\frac{dN}{dt} = rN \left(\frac{K - N}{K}\right)$ represents which of the following?

In the given figure,what do $a$ and $b$ represent respectively?

The human population growth curve of today is:

Given below are two statements.
Statement $I$: Under unlimited resource conditions,every species is capable of growing exponentially.
Statement $II$: $A$ population growing in a habitat with limited resources initially shows a very slow rate of growth.
In the light of the above statements,choose the correct option.

In a growing population of a country,

In which of the following is exponential growth observed?