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Organisms And Populations

Question
CBSEENBI12002163
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When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1-N/K)

  • when N nears the carrying capacity of the habitat

  • when N/K equals zero

  • when death rate is greater than birth rate

  • when N/K is exactly 1

Solution

D.

when N/K is exactly 1

In logistic growth model population growth equation is described as
dN over dt space equals space r N space left parenthesis fraction numerator K space minus space N over denominator K end fraction right parenthesis
where,
N = Population density at time t
r = Intrinsic rate of natural increase
K = Carrying capacity
When, N/K = 1 then
fraction numerator straight K space minus space straight N over denominator straight K end fraction equals space 0 T h e r e f o r e comma fraction numerator d N over denominator d t end fraction equals space 0

Some More Questions From Organisms and Populations Chapter

The number of births during a given period in the
population that are added to the initial density is 

 :

The departure of a individual from a population is called :

In which interaction only one species is benefitted while the other species is neither harmed nor benefitted ?

Which of the following interaction both species suffer ?

In which of the following interaction both species are benefitted ?

Fill in the blanks with suitable words :

1. The optimal capacity of the organism to produce offspring is called........................

2. Rapid increase in human population is called........................

3. Mathematical expression of the growth of population is called........................

4. Yeast cells grown in a culture medium show........................growth curve.

5. Main cause of population explosion is........................

State true or false :

Coin one word for the following statements :

1.Organism that can tolerate only a narrow range of salinity.

2. Plants that can survive a wide range of temperature.

3. Interaction of two species in which one is benefited while other is neither benefited nor harmed.

4. Number of births during a given period in the population that are added to the initial density.

5. the process of maintaing a constant body temperature.

A few organisms can tolerate and thrive in a wide range of temperature, they are called........................

Majority of organisms are restricted to a narrow range of temperature, such organisms are called ........................ 

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