Biology, asked by kataravinod764, 11 months ago

Logistic growth of a population

Choose answer:
Is shown by a J-shaped curve
Occurs when the resources in a habitat are limited
Never shows an asymptote
Is also called as geometric growth

Answers

Answered by Anonymous
89

Answer:

Correct answer: Option (2) Occurs when the resources in a habitat are limited

Logistic growth of a population occurs when the resources in a habitat are limited.

Explanation:

Logistic \:  growth : \\   \\ It  \: describes  \: a  \: situation \:  in \:  which  \:  \\ resources  \: present  \: in \:  the \:  environment \:   \\ are \:  limiting. \:  In  \: nature,  \: a \:  given \:  \\  habitat \:  has  \: enough  \: resources  \: to \:   \\ support  \: a \:  maximum \:  possible \:   \\ number, \:  beyond  \: which  \: no  \: further \:  \\  growth \:  is \:  possible.  \: This \:  natural  \:  \\ limit  \: for  \: that \:   species  \: in \:  that \:   habitat  \:  \\ is \:  called  \: carrying  \: capacity  \: (K). \:  \\  Thus,  \: nature  \: does \:  not \:  dispose/provide  \:  \\ unlimited \:  resources  \: availability \:  to  \: \\  permit  \: exponential  \: growth  \: to \:  population  \:  \\ of  \: any \:  species. \:  This  \: leads \:  to  \: competition \:   \\ between \:  individuals  \: for  \:  limited  \: \\  resources \:  and  \: hence, \:  the  \: fittest  \:  \\ individual  \: will \:  survive \:  and  \: reproduce. \\  \\  \\

 The  \: sum  \: of  \: environmental \:  factors \:   \\ that  \: limits  \: the \:  population \:  size  \: is \:  called \:  \\  environmental  \: resistance. \:  \\  Environmental  \: resistance  \: rises \:  with \:   \\ the  \: rise  \: in  \: population \:  size. \:   \\ The  \: influence  \: of  \: environmental \:  \\  resistance \:  over  \: the \:  biotic \:  potential \:  is \:   \\ denoted  \: by  \:  (\frac{K - N}{K}) . \\  \\  \\

 Following  \: are \:  important \:  aspects  \: \\  of \:  logistic  \: growth : \\  \\ (i)  \: A \:  population  \: growing  \: in \:  a \:  habitat  \:  \\  \:  \: with \:  limited \:  resources  \: shows  \: initially  \:   \\  \:  \: a  \:  lag  \: phase,  \: followed  \: by  \: phases  \: of  \:  \\ \:   \: acceleration \:  then \:  deceleration  \: and  \:  \\  \:  \: finally  \: an \:  asymptote, \:  when  \: the  \: \\  \:  \:  population  \: density  \: reaches \:  the  \:  \\  \: \:  carrying \:  capacity. \\  \\ (ii) Such  \: a  \: population  \: growth \:  is  \: \\  \:  \:  represented  \: by  \: a  \: sigmoid  \: curve. \\  \\ (iii) This  \: type  \: of  \: population \:  growth  \:  \\  \:  \: is \:  called \:  Verhulst \:  Pearl \:  Logistic \:   \\  \:  \: Growth \:  and \:  is  \: described \:  by \:  the  \: \\   \:  \: equation \:  \frac{dN}{dt}  = rN ( \frac{K-N}{K} ) \\  \\ Where,  \: N = Population  \: density \:  at  \: \\  time  \: t;   \: r = Intrinsic  \: rate \:  of  \: natural  \: \\  increase;  \: K = Carrying  \: capacity \\  \\  \\

Since,  \: resources  \: for \:  growth \:  for  \: most \:   \\ animal \:  populations \:  are  \: finite  \: and \:  \\  become \:  limiting  \: sooner  \: or  \: later, \:  \\ the \:  logistic \:  growth  \: model  \: is \:  considered  \:  \\ a  \: more  \: realistic \:  one.

Similar questions