How can the knowledge of the processes of reproduction help people in limiting the size of their families? Give two concrete examples.

What is the idea behind the phrase "population explosion"?

Given below are hypothetical figures in regard to population (in crores) of two countries A and B during the last three decades.

Fill in the blanks:

(a) Rate of growth of population of country ……………… has declined between years ……………. and …………….

(b) The country ………………. shows negative population growth between years ………………. and ……………….

(c) The country ……………….. shows zero population growth between years …………….. and ………………..

Observe the diagrams (A) and (B) given below and answer the following questions.

(a) Label the parts 1 to 5.

(b) What does figure A depict?

(c) What does figure B depict?

(d) Comment on P and Q.

(e) Mention one function each of part 2 and 4.