Assertion A : The logistic growth model of populations is considered more realistic than the exponential growth model.
Reason R : Resources are finite.
In the light of the above statements, choose the most appropriate answer from the options given below :
Analyzing Assertion A: Logistic vs. Exponential Growth
Assertion A claims the logistic growth model is more realistic than the exponential growth model. This is accurate.
- The exponential model assumes unlimited resources, leading to J-shaped growth, which is unrealistic long-term.
- The logistic model incorporates environmental limits and a carrying capacity (K), producing an S-shaped curve that better represents real populations approaching resource limits.
Analyzing Reason R: Finite Resources
Reason R states that resources are finite. This is a fundamental principle in ecology. Limited availability of food, space, and other necessities naturally restricts population expansion.
Evaluating the Assertion-Reason Link
Although both statements are true, Reason R is not the direct explanation for Assertion A.
- The finiteness of resources is the underlying ecological reason *why* populations cannot grow exponentially indefinitely.
- However, Assertion A refers specifically to the *realism of the logistic model*. The model's realism comes from its mathematical structure that incorporates the *consequences* of finite resources (like density-dependent effects and approaching carrying capacity), not just the fact that resources are finite.
- Therefore, while R is true and related, it doesn't fully explain the specific realism attributed to the logistic model structure itself.
Final Conclusion
Both Assertion A and Reason R are factually correct statements about population ecology. However, the reason provided does not sufficiently explain *why* the logistic model is considered more realistic than the exponential model.
The correct choice is: Both A and R are correct but R is not the correct explanation of A.
Similar Questions
- 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 ?
- Consider a population of 10 million cells. Given the per-capita birth rate of 0.002 (per unit time) and the per-capita death rate of 0.002 (per unit time), the expected number of cells after 10 generations is
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 ?
