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Question: Which one of the following sequences was proposed by Darwin and Wallace for organic evolution A) o...

Which one of the following sequences was proposed by Darwin and Wallace for organic evolution
A) overproduction, variations, constancy of population size, natural selection
B) variations, constancy of population size, overproduction, natural selection
C) overpopulation, constancy of population size, variations and natural selection
D) variations, natural selection, overproduction, constancy of population size

Explanation

Solution

Hint:- The theory of Organic evolution was given by Darwin and Wallace. The theory says that all the plants and animals of recent days originated from some pre-existing species. Today’s plants and animals are different from their ancestors in that they have modified themselves to adapt to the changing environment. The theory was designed by them in 1858.

Complete answer:-
According to the theory proposed by Darwin and Wallace, the plants and animals produced a huge number of descendants. Variation was a character observed in the population produced by them.
This great number of individuals could not survive due to limited resources. Now, this number had to be reduced to such that they could have a peaceful existence without the lack of resources. So the concept of ‘survival of the fittest’ was adopted to select the population that was to be removed from the system. This process is known as natural selection. In natural selection, only those species could survive that could fight for its existence. Thus the fittest of the species continued to live while the weak ones were eliminated.
Thus, the sequence of events sums up to - overproduction, variations, the constancy of population size followed by natural selection in which the population was cut down according to the available resources.
Thus, the right option is A.

Note:- The organic evolution was a result of genetic changes that occurred in the species. The organic evolution was a modification of Darwin’s On The Origin Of Species. The other theories of evolution are the Mutation Theory of De Vries, Theory of Natural Selection, and Neo- Darwinism.