Which of the following is not correct with reference to exponential growth model?
Resources are limited
The exponential growth model assumes that resources (food and space) are unlimited. Each species then realises its full innate potential to grow, described by dN/dt = rN, and the population increases in a geometric (J-shaped) fashion.
Resources are limited — this is the assumption of the logistic (Verhulst-Pearl) model, not the exponential one, so this statement is not correct for exponential growth.
Population grows in a geometric fashion — correct; with unlimited resources numbers multiply at a constant rate r.
A stationary phase is never reached — correct; the J-shaped curve has no plateau, unlike the S-shaped logistic curve.
Population grows beyond carrying capacity — consistent with the model; since no carrying capacity limits it, the population keeps increasing past any such level.
Resources are limited option is correct.
Similar Questions
Given below are two statements.
Statement I: There is less species biodiversity in tropical latitudes than in temperate region
Statement II: Tropical environments unlike temperate ones are less seasonal, relatively more constant and predictable.
In the light of the above statements, choose the correct answer from the options given below.
The Annual Net Primary Productivity on land and ocean respectively are ________ and ________ billion tons.
Which one of the following options represents the steps of decomposition in sequence?
The following graphs represent age pyramids of a population.
Identify the correct option representing the status of age pyramids labelled as A, B and C.
Important Questions from Ecology
- Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced.
Reason R : Goats were more efficient at browsing than Abingdon tortoise.
In the light of the above statements, choose the most appropriate answer from the options given below : - Which of the following statements are correct ?
(a) Energy flow from producers to consumers is unidirectional
(b) Energy pyramid can never be inverted
(c) Transfer of energy follows the 1% law
Choose the correct answer from the options given below : - Arrange the following in descending order of number of species in the Amazonian rain forest.
(a) Plants
(b) Birds
(c) Fishes
(d) Invertebrates
(e) Mammals
Choose the correct answer from the options given below : - Match List-I with List-II.
List-I List-II A. Both species are harmed I. Predation B. One species is harmed and the other is benefited II. Mutualism C. Both species are benefited III. Competition D. One is benefited while the other has no effect IV. Commensalism
Choose the correct answer from the options given below : - Which of the following are primary consumers in a food chain ?
