Question

The diagram shows a summary of Darwin’s theory of natural selection.
Which statement should be placed in boxes 1, 2, and

A.There is a struggle for existence=1, Variation is shown in all populations=2, individuals show great reproduction capacity=3
B.There is a struggle for existence=2, Variation is shown in all populations=1, , individuals show great reproduction capacity=3
C.There is a struggle for existence=2, Variation is shown in all populations=3, individuals show great reproduction capacity=1
D.There is a struggle for existence=3, Variation is shown in all populations=1, individuals show great reproduction capacity=2

Answer 1

Hint: The differential survival and reproduction of individuals due to differences in phenotypes is a key mechanism in evolution. The term natural selection was proposed by Charles Darwin and further contrasted it with artificial selection. The process of natural selection acts on the phenotype of an organism making the genetic basis of phenotype more common in the population.

Complete answer:Charles Darwin proposed the concept of natural selection in a joint presentation of papers. According to the concept of natural selection, he described it as analogous to artificial selection, a cycle by which creatures and plants with attributes considered alluring by human raisers are methodically preferred for proliferation. The idea of common choice initially created without a substantial hypothesis of heredity; at the hour of Darwin's composition, science still couldn't seem to create current speculations of hereditary qualities.
The theory of natural selection is based on four basic postulates-
1.Variation,
2.Inheritance,
3.Selection(survival of the fittest) and
4.Time.
These four points are considered as the components of the evolutionary mechanism of natural selection.
So, the order of correct statements is as follow-
There is a struggle for existence=2, Variation is shown in all populations=3, individuals show great reproduction capacity=1

The correct answer is an option (C), There is a struggle for existence=2, Variation is shown in all populations=3, individuals, show great reproduction capacity=1.

Note:Charles Darwin's theory of evolution laid emphasis on evolution and it states that happens by natural selection. A species contains individuals and these individuals show variation in physical characteristics (phenotypically). As a consequence those individuals most suited to their environment survive (survival of the fittest) and, given enough time, the species will gradually evolve.