Q. 285.0( 1 Vote )

(a) Name the popu

Answer :

(a): equation represents Exponential growth.


‘r’ represents rate of natural increase


Importance of ‘r’ in population growth:


This is the parameter for assessing the impacts of any biotic or abiotic factor on population growth.


(b) In nature , a given habitat has enough resources to support a maximum possible number, beyond which no further growth is possible. This is called Carrying capacity (K) of a habitat.




is the equation, this logistic curve shows sigmoid curve and is called Verhulst-Pearl logistic curve.


where, N= population density at time t


r= intrinsic rate of natural increase


k= carrying capacity


The logistic growth model is considered more realistic since, resources for growth of most animal populations are finite and become limited sooner or later.


OR


(a): Energy flow in an ecosystem is always Unidirectional.


i.e: Solar radiation———>Producers———>Herbivores——->Carnivores


There is decrease in content and flow of energy with rise in trophic level. A part of energy captured by producers is used for maintenance and as food to herbivores. From herbivores it goes to carnivores.


When energy flows from a particular trophic level to the next trophic level, she energy is always lost as heat at each step.


Only 10% of energy is utilised at each tropic level, 90% of energy is lost as body heat, respiration and other activities.


Each bar in the energy pyramid indicates the amount of energy present at each trophic level in a given time or annually per unit area.


(b): The two limitations of ecological pyramid are as follows:


1. It assumes a simple chain, it does not take into account the same species belonging to two or more trophic levels.Simple food chain never exists in nature, it does not accommodate a food web.


2. Saprophyte are not given any place in ecological pyramids even though they play a vital role in the ecosystem.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

(a) The graph givBiology - Board Papers

The following diaBiology - Exemplar

What are the shorBiology - Exemplar

Poaching of tigerBiology - Exemplar

Fill in the trophBiology - Exemplar