Which of the following is correct for r-selected species?

  • Option 1)

    Large number of progeny with small size

  • Option 2)

    Large number of progeny with large size

  • Option 3)

    Small number of progeny with small size

  • Option 4)

    Small number of progeny with large size

 

Answers (1)
V Vakul

As learnt

Equation for exponential growth -

If in a population of size N, the birth rates (not total number but per capita births) are represented as b and death rates (again, per capita death rates) as d, then the increase or decrease in N during a unit time period t (dN/dt) will be:

 

- wherein

dN/dt = (b – d) × N

Let (b–d) = r, then

dN/dt = rN

The r in this equation is called the ‘intrinsic rate of natural increase’

and is a very important parameter chosen for assessing impacts of

any biotic or abiotic factor on population growth.

 

 

r-selected species are the species having the ability to produce large number of progenies (off spring) with small size. The population growth of these species is function of biotic potential.


Option 1)

Large number of progeny with small size

This option is correct

Option 2)

Large number of progeny with large size

This option is incorrect

Option 3)

Small number of progeny with small size

This option is incorrect

Option 4)

Small number of progeny with large size

This option is incorrect

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