$A$ : 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.

  • A

    Assertion and Reason both are correct and also correct explanation.

  • B

    Assertion and Reason both are correct but not explanation of assertion.

  • C

    Assertion is correct, but Reason is incorrect.

  • D

    Both Assertion and Reason are incorrect.

Similar Questions

Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of

  • [AIPMT 2009]

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.

  • [AIIMS 2012]

$A$ : 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.