It took only _____ years for world population to rise from 5 billion to 6 billion.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 12
It took more than a million years for the human population to attain the one billion mark. But it took only 12 years for it to rise from 5 billion to 6 billion.
Note: this question is from Pre rationalised NCERT textbook.
