Question

1. Compare and classify the population densities shown in the squares ‘a’ and ‘b’ representing 1 sq. km of area.
2. If in figure B, one sign = 100, then what will be the sex ratio?

(a)

(b)

Answer 1

(a)

In fig. (a) density of population is 7 persons per sq. km. The region is sparsely populated.
In fig. (b), the density of population is 18 persons per sq. km. The region is densely populated.

(b)

Given that, one symbol = 100 persons. 
Since there are 10 female symbols, there are: 
10 × 100 = 1000 females
Since there are 8 male symbols, there are: 
8 × 100 = 800 males
If number of males = 1000,
then the number of females = ?

∴ Sex ratio = `(1000 xx 1000)/800`

= 1250

Sex Ratio is 1250 females per 1000 males.