Q.
Following table summarises the differences between natality and mortality. Select the incorrect ones.
Natality
Mortality
(i)
Natality is number of
births per unit popula
tion per unit time.
It is number of deaths
per unit population
per unit time.
(ii)
It adds new individu
als to the population.
It removes individuals
from the population.
(iii)
It increases the size of
population.
It decreases the size of
population.
(iv)
It increases population density.
It reduces population
density.
(v)
It is low when population size is small and
high when population
size is large.
It is high when popu
lation size is small and
low when population
size is large.
| Natality | Mortality | |
|---|---|---|
| (i) | Natality is number of births per unit popula tion per unit time. | It is number of deaths per unit population per unit time. |
| (ii) | It adds new individu als to the population. | It removes individuals from the population. |
| (iii) | It increases the size of population. | It decreases the size of population. |
| (iv) | It increases population density. | It reduces population density. |
| (v) | It is low when population size is small and high when population size is large. | It is high when popu lation size is small and low when population size is large. |
Organisms and Populations
Solution: