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Biology
Organisms and Populations
90 questions from 35 papers, each with its answer.
- 90 questions
- 35 papers
- 2.55% of Biology
Population growth – logistic model
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When does the growth rate of a population following the logistic modal equals zero? The logistic model is given as $\frac{dN}{dt} = rN\left(1 - \frac{N}{K}\right)$
Growth stops exactly when N = K.
$\frac{dN}{dt} = rN\left(\frac{K - N}{K}\right)$, where N = population density, r = intrinsic rate of natural increase, K = carrying capacity
When $\frac{N}{K} = 1$, $\frac{K - N}{K} = 0$, therefore $\frac{dN}{dt} = 0$.
Body size and metabolic rate
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It is much easier for a small animal to run uphill than for a large animal, because
Smaller animals have higher mass-specific metabolic rates.
The metabolic rate of an organism at rest at normal temperature is its basal metabolic rate (BMR). BMR is inversely proportional to body weight.
Small animals have a higher BMR, so they get more energy and can run uphill more easily than larger animals.
That is every question in Organisms and Populations for this filter.
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