Welcome to the NCERT Solutions for Class 12 Biology - Chapter Evolution. This page offers a step-by-step solution to the specific question from Exercise 0, Question 4: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.
While creation and presence of variation is directionless, natural selection is directional as it is in the context of adaptation. Comment.
Variation is defined as the differences among the number of species and offspring of the same parents. All the organisms show variation among every character and in all the direction or we can say directionless. And, the heritable genetic change in the genetic material of an organism that gives rise to alternate forms of any gene is known as mutation (by this organisms would able to survive or adapt to the environmental changes). On the other hand, natural selection to describe the process by which organisms with favourable conditions or variation will survive and reproduces at higher rate. An inherited variations which increases the chances of organism’s survival in the particular environment is known as adaptation and who will not adapt the variations among the environment will die. Thus, we can say that environment provides the direction (this selection brings progressive evolution of traits) with respect to adaptations so that more and more organisms fits the best suited environment.
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