Organisms and Populations

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Population Growth Models

$\frac{dN}{dt} = rN$

Exponential growth model where population grows without limits.

Terms:

dN/dt

Rate of change of population size

individuals per timer

Intrinsic rate of natural increase

per timeN

Population size

individuals

$\frac{dN}{dt} = rN \left(\frac{K-N}{K}\right)$

Logistic growth model where growth is limited by carrying capacity.

Terms:

dN/dt

Rate of change of population size

individuals per timer

Intrinsic rate of natural increase

per timeN

Population size

individualsK

Carrying capacity

individuals

Population growth models describe how populations change over time. Exponential growth occurs when resources are unlimited, while logistic growth occurs when resources are limited.

Common Use:

Used to predict population changes in ecology and conservation biology.

Practice Related Questions

Ecology

Exponential Growth

Logistic Growth

Population Growth

1 of 5.

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Practice Questions

NEET Questions

1. Match the following and select the correct option:

2. A scrubber in the exhaust of a chemical industrial plant removes

3. Rachel Carson’s famous book ‘Silent Spring’ is related to

4. The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that

When does the growth rate of a population following the logistic model equal zero? The logistic model is given as $\\ dN/dt = rN(1 - N/K)$

Asymptote in a logistic growth curve is obtained when

Natality refers to

Niche is

In a growing population of a country,

10.

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

11.

Which of the following is not an attribute of a population?

12. Dobson units are used to measure thickness of:

13. Match List - I with List - II.

14. While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (–) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (–) for another species involved in the interaction?

15. If ‘8’ Drosophila in a laboratory population of ‘80’ died during a week, the death rate in the population is ______ individuals per Drosophila per week.

16.

Match List I with List II:

17.

Match List I with List II

18.

Match List I with List II: