HORTICULTURE SCIENCE
DISEASE AND PEST MANAGEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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70 years
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7 years
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35 years
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3.5 years
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Detailed explanation-1: -For example, a population with a 2% annual growth would have a doubling time of 35 years.
Detailed explanation-2: -Population Growth Calculation To calculate the Population Growth (PG) we find the difference (subtract) between the initial population and the population at Time 1, then divide by the initial population and multiply by 100.
Detailed explanation-3: -The Rule of 70 Imagine that we have a population growing at a rate of 4% per year, which is a pretty high rate of growth. By the Rule of 70, we know that the doubling time (dt) is equal to 70 divided by the growth rate (r). That means our formula would look like this: dt = 70 / r.
Detailed explanation-4: -Global population growth rate = (CBR-CDR)/ 10. National population growth rate = (CBR+ immigration)-(CDR + emigration)/ 10. Doubling time (in years)-70/growth rate.