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Organisms And Populations

Question
CBSEENBI12001123
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With the help of suitable diagram describe the logistic population growth curve.

Solution

Logistic population growth curve states that environment does not have unlimited resources and cannot permit exponential growth. In nature, a given habitat has resources to support a certain possible number, beyond which no further growth is possible. This limit is called as carrying capacity (K) for that species in that habitat.
A population growing in a habitat with limited resources shows initially a lag phase, followed by phases of increase and decrease and finally the population density reaches the carrying capacity. A plot of N in relation to time (t) results in a sigmoid curve. This type of population growth is called Verhulst-Pearl Logistic Growth as explained by the following equation:
                dNdt = rNK-NK



Logistic Population growth curve 

It shows the different phases of the Logistic growth
(i) Lag phase- during this period the population shows avery slow growth due to limited resources.
(ii) Acceleration phase where the population grows at a high rate due to availability of resources.
(iii) Decceleration phase where the population growth decreases due to less resources.
(iv) Steady state - when the growth stops and the population reaches its carrying capacity.

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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