$A$ : Some organisms can maintain internal homeostasis by means of physiological processes and are called
'Regulators'.
$R$ : 'Regulators' can maintain internal homeostasis only upto a limit of stressful conditions.
Assertion and Reason both are correct and also correct explanation.
Assertion and Reason both are correct but not explanation of assertion.
Assertion is correct, but Reason is incorrect.
Both Assertion and Reason are incorrect.
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of
Which one of the following is not a matching pair of certain organism(s) and the kind of association?
The ecologically fixed and genetically irreversed species are called
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.