Which of the following statements is correct?
$I.$ In a population,birth rate and death rate refer to per capita births and deaths,respectively.
$II.$ In nature,we rarely find isolated single individuals of any species.
$III.$ The size of a population for any species is a stable phenomenon.
$IV.$ Ecological effects of any factors on population growth are generally reflected in its size/population density.
$I.$ In a population,birth rate and death rate refer to per capita births and deaths,respectively.
$II.$ In nature,we rarely find isolated single individuals of any species.
$III.$ The size of a population for any species is a stable phenomenon.
$IV.$ Ecological effects of any factors on population growth are generally reflected in its size/population density.
- A$I$ and $II$
- B$II$ and $III$
- C$I, II$ and $III$
- D$I, II$ and $IV$
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The figure given below is a diagrammatic representation of the response of organisms to abiotic factors. What do $a$,$b$,and $c$ represent respectively?
MediumAIIMS 2015
View SolutionMatch List $I$ with List $II$.
$A$. Natality $I$. $\frac{dN}{dt} = rN$ $B$. Exponential growth $II$. Death rate $C$. Mortality $III$. Birth rate $D$. Logistic growth $IV$. $\frac{dN}{dt} = rN \left[1 - \frac{N}{K}\right]$
| $A$. Natality | $I$. $\frac{dN}{dt} = rN$ |
| $B$. Exponential growth | $II$. Death rate |
| $C$. Mortality | $III$. Birth rate |
| $D$. Logistic growth | $IV$. $\frac{dN}{dt} = rN \left[1 - \frac{N}{K}\right]$ |
Easy
View SolutionRead the given statements and identify the correct and incorrect ones.
$(1)$ The exponential growth curve can be calculated using the formula $N_t = N_0 e^{rt}$.
$(2)$ Bamboo and salmon fish show the production of offspring only once during their entire lifespan.
$(3)$ In the amensalism type of interaction,one species is harmed and the other species receives no benefit or harm.
$(4)$ $A$ competitively superior species eliminates the inferior species in a habitat.
$(1)$ The exponential growth curve can be calculated using the formula $N_t = N_0 e^{rt}$.
$(2)$ Bamboo and salmon fish show the production of offspring only once during their entire lifespan.
$(3)$ In the amensalism type of interaction,one species is harmed and the other species receives no benefit or harm.
$(4)$ $A$ competitively superior species eliminates the inferior species in a habitat.
Medium
View Solution$A$ country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations $A$ and $B$ twenty years apart. Select the correct interpretation about them.
MediumAIPMT 2009
View SolutionMatch the column-$I$ with column-$II$ and select the correct option given:-
Column-$I$ Column-$II$ $A$. $J$-shape curve $(i)$ Sigmoid curve $B$. Verhulst-Pearl logistic growth $(ii)$ Breed only once in their lifetime $C$. Extinction of Abingdon tortoise $(iii)$ Competition for same resources $D$. Pacific salmon fish and Bamboo $(iv)$ Resources unlimited
| Column-$I$ | Column-$II$ |
| $A$. $J$-shape curve | $(i)$ Sigmoid curve |
| $B$. Verhulst-Pearl logistic growth | $(ii)$ Breed only once in their lifetime |
| $C$. Extinction of Abingdon tortoise | $(iii)$ Competition for same resources |
| $D$. Pacific salmon fish and Bamboo | $(iv)$ Resources unlimited |
Medium
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