Question

Which of the following evidences are in favour of Darwinism?

• A. Struggle for existence
• B. Entomophily
• C. Artificial selection
• D. All of the above

Answer 1

The correct option is A Struggle for existence

Evolution brings a remarkable change in the morphology, anatomy and genetic of a living organism which helps them to adjust in a better manner in the environment and coordinate with the fluctuating conditions with time. These changes create variations generation after generation. Darwin's theory of organic evolution focuses on over-production, struggle for existence, variations, survival of the fittest and natural selection. There is a competition within species for reproduction, food and for resources. This struggle between the organisms of the same species is known as "intra-specific competition" and the organisms of two different species is referred as "inter-specific competition", so they engage in a "struggle for existence". In this struggle, either majority of the organisms die before their maturity or lose the opportunity for reproduction though they are matured. Variations occur in individual organisms and inherit as traits. Individuals with traits that are well suited for the struggle win and those who are with unsuitable traits loose. And more suited traits will be inherited and passed to next generations from parents to new off springs. As the time passes, organisms with unsuitable characteristics will eliminate from that eco-system, that is survival for the fittest. Remaining organisms reproduce, thereby change the frequency of traits within the population. This process is natural selection. Thus, the correct answer is option A.