Question

The phase of population growth having equal natality and mortality is
(a) Lag phase
(b) Plateau phase
(c) Exponential phase
(d) Log phase

Answer 1

Hint: This is the phase of equilibrium when the birth rate is equal to the death rate of a population similar to that geographical area that neither belongs to the plain nor to the mountain.

Complete answer:
When the birth rate or natality and the death rate or mortality become equal, the population stops growing and attains a stage of equality. This stage of equality is known as the plateau phase of population growth. So we can say that the increased mortality rate equals the natality rate leads to the situation when the population size becomes constant

Additional Information: -For keeping the population size balanced Limited resources, predation, and disease all play a very important role.
-Since the population size at this point may not be static, it will oscillate around the carrying capacity to remain relatively even that means no net growth.
-For the occurrence of population growth every species has limits to the environmental conditions it can endure and have to remain within appropriate levels.
-Some of these factors depend upon population density, while others are not related to the density of the population
-The lag phase is the phase during which the bacterias are adjusting to their environment.
-The log face is a phase during which a population grows in a logarithmic fashion as the population of crow grows and bacterias consume available nutrients and produce waste products.
-Explanation phase, the period which is characterized by the doubling of cells.
So, the correct answer is 'Plateau phase'.

Note: -Natality: The rate by which the population size increases through reproduction (i.e. birth rate)
-Mortality: The rate by which the population size decreases as a result of death (i.e. death rate)
-Since the population size at this point may not be static, it will oscillate around the carrying capacity to remain relatively even that means no net growth.