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(d) : Both the populations are herbivorous, thus they cannot affect each other. If the food sources for these populations $A$ and $B$ have decreased,

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population $B$ competed more successfully for food than population $A$

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(d) : Both the populations are herbivorous, thus they cannot affect each other. If the food sources for these populations $A$ and $B$ have decreased, then both the populations $A$ and $B$ would have declined. If population $A$ have produced more offspring then the graph $A$ should have increased. Based on the graph, population $B$ is more successful in competing with population $A$, that is why number of organisms in population $B$ increased while that in population $A$ decreased, as they get access to limited resources.

$Country$	$Birth\, rate$ $/1000$	$Death$ $/1000$
$M$	$15$	$5$
$N$	$25$	$10$
$O$	$35$	$18$
$P$	$48$	$41$

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

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Give differences: Natality rate and Mortality rate

The birth and death rates of four countries are given below. Which one will have the least population growth rate?

$Country$ $Birth\, rate$ $/1000$ $Death$ $/1000$

$M$ $15$ $5$

$N$ $25$ $10$

$O$ $35$ $18$

$P$ $48$ $41$

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