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3.Reproductive Health
normal
The percentage ratio of natality over mortality is called
A
Vital index
B
Population density
C
Total count of individuals
D
Fertility rate
Solution
(a) The percentage ratio of natality over mortality is known as vital index
$i.e.$, natality/mortality $\times$ $100$.
It determines the growth of a population.
Standard 12
Biology
Similar Questions
Match Column $-I$ with Column $- II$
|
Column $-I$ Method |
Column $-II$ Mode of Action |
| $A.$ The pill | $I.$ Prevents sperms reaching cervix |
| $B.$ Condom | $II.$ Prevents implantation |
| $C.$ Vasectomy | $III.$ Prevents ovulation |
| $D.$ Copper $T$ | $IV.$Semen contains no sperms |
