STD 12 - 3. reproductive health — BIOLOGY STD 12 Science — Question

Rapid growth is called exponential growth. In $1700 \;AD$ human population was about $0.6 \;billion$. At the beginning of the twentieth century, it increased to $1.6\; billion$, and by the end of the century, the human population reached $6.1\; billion$. This rapid increase in population over a relatively short period is called population explosion.

In the $150 \;years$ from $1700 \;AD$ human population doubled from $0.6\; billion$ to $1.2\; billion$. In contrast, it increased five time during the next $150 \;years$. In $2011 $it was $7 \;billion$