Exponential growth occurs when:
Biotic potential is high
Death rate is low
Environmental resistance is little
Population is large
What is meant by zero population growth?
No new births
No emigration
Gain and loss are equal
No immigration
World population day is:
June 5th
July 11th
October 2nd
March 21st
When does population becomes stable?
At the end of exponential growth
Around carrying capacity
When environmental resistance is high
When environmental resistance is low
In 1980 human population was:
1 billion
2 billion
3 billion
4 billion
What is biotic potential?
Number of offsprings added to the population
Number of offsprings borne in a given time per unit of population
Maximum birth rate under ideal conditions
Maximum birth rate under existing conditions
What is amniocentesis?
Post natal diagnostic technique
Pre natal diagnostic technique
Check up of one pregnant women for any deficiency
Check up of pregnant women for any reaction
Environmental resistance comprises of:
Limitation of food
Diseases
Predation
All the above
At the current rate of growth, human population doubles every:
20 years
35 years
45 years
60 years
Life expectancy has increased due to
a) Greater availability of food
b) Better public health care
c) Greater medical care
a only
a and b only
b and c only
c only