Question

Which of the following is/are incorrectly matched?

Organism	r value
1. Norway rat	0.012
2. Flour beetle	0.12
3. Human population in 1981	0.015

• A. 1 and 3
• B. Only 1
• C. Only 2
• D. 2 and 3

Answer 1

The correct option is A 1 and 3

Intrinsic rate of natural increase (r) or the Malthusian parameter is the difference between the number of births and the number of deaths per capita in a population. The higher the ‘r’ value, the faster the growth rate. It can be expressed as, r = b-d

Where,

b is birth rate i.e. the total number of live births in a population per year

d is death rate i.e. the total number of deaths in a population per year

For the Norway rat, r is 0.015, for the flour beetle r is 0.12 and for the human population in India in the year 1981 the r value was 0.0205. Thus 1 and 3 are incorrectly matched.