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Biology · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 1 · Q28
(a) Draw a graph for a population whose population density has reached the carrying capacity. (b) Out of the two population growth curves, which one…
(a)
Draw a graph for a population whose population density has reached the carrying capacity.
(b)
Out of the two population growth curves, which one is considered a more realistic for most populations? Why?
(c)
Draw a growth curve where resources are not limiting for the growth of a population and give its equation.
Marking-scheme solution
(a)
(b)
$\displaystyle \star$ Verhulst-Pearl logistic growth/ Logistic growth curve/ Sigmoid growth curve
$\displaystyle \star$ Since resource for growth for most animal populations are finite and become limiting sooner or later.
(c)
Equation : $\displaystyle \frac{dN}{dt} = rN$ / $\displaystyle \frac{dN}{dt} = (b-d)N$ / $\displaystyle N_t = N_0 e^{rt}$
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