The average concentration of $CO_2$ in the atmosphere is
$10 ppm$
$100 ppm$
$300 ppm$
$1000 ppm$
It’s obvious.
Assertion : Thick cuticle is mostly present in disease resistant plants.
Reason : Disease causing agents cannot grow on cuticle and cannot invade the cuticle.
$A$ : 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.
Who defined ecology as the reciprocal relationship between organisms and their environments
Term ‘ecology’ was proposed by
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