World environment day is celeberated on
$15^{th}$ March
$15^{th}$ April
$4^{th}$ May
$5^{th}$ June
It’s obvious.
The $ pH$ of a fertile soil is usually around
Soil porosity is maximum in
The species of plants that play a vital role in controlling the relative abundance of other species in a community are called
$A$ : Different ecotypes of a species despite being genotypically different are interfertile. $R$ : They are locally natural selections from a pool of genetic variations found in gene pool of a species.
The apex of age pyramid of a stationary population is
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