Name: Adaptation in Response to Abiotic Factors
Uploaded: 2019-07-19
Duration: 18 min 40 s
Description: Do you know the special skill that helps an animal survive and do everything it needs to do in adverse conditions? Its adaptation. Let's discover that skill.

Question

With the help of suitable diagram describe in brief the sigmoid curve and J- shaped curve.

Accepted Answer

S-shaped or sigmoid growth curve :

Characteristics of such curve are initial lag phase followed by positive acceleration phase, exponential phase, negative acceleration phase and stationary phase one after the other.

Lag phase - Phase showing adaptation of a small population to the new environment.

Positive Acceleration phase - Rise in population takes place at a slow rate.

Exponential phase - Steep rise in curve is seen due to rapid increase in population to its full potential. Under favourable environmental conditions, sufficient food supply, lack of predator and competition.

Negative acceleration phase - Increase in resistance from environment and competition for food and space, slows down growth rate and increases rate of mortality.

Stationary phase - With availability of resources population remains stable. A stable population is said to be in equilibrium or at saturation level.

S_ shaped curve is called Verhulst_ pearl logistic curve.

J_ shaped growth curve:

J - shaped growth curve shows bag phase and exponential phase.

Lag phase - In this phase no significant rise in population takes place due to slow adaptation to their environment.

Exponential phase - Rapid multiplication takes place with the availability of food.

A decrease in the food supply causes starvation and mortality.

With the help of suitable diagram describe in brief the sigmoid curve and J- shaped curve.

Important Questions on Ecology Environment & Population

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