Assertion: Organisms that reproduce by binary fission are immortal. Reasoning::Such organisms have special kind of rejuvenation capability.

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A. Both Assertion (A) and reasoning (R) are correct and but R is not the correct explanation of A. Assertion (A) is true but Reasoning (R) is not correct. If both Assertion (A) and Reasoning are false (F )

Both Assertion (A) and reasoning (R) are correct and but R is not the correct explanation of A.

In binary fission, the reproductive unit is comprised of the parent body as a whole, which gives rise to two daugther cells upon completion of the process. There are, however, no remnants and thus, the parent body cannot be said to be dead. The parent continues its life in the form of two daughter cells and hence, organisms undergoing binary fission are regarded immortal.