Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up

Question

Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements.

Statements:
(A) Wings of butterflies and birds look alike and are the results of (i)____, evolution.
(B) Miller showed that CH4, H2, NH3, and (i)____, when exposed to electric discharge in a flask resulted in the formation of (ii)____.
(C) Vermiform appendix is a (i)____ organ and an (ii)____ evidence of evolution.
(D) According to Darwin evolution took place due to (i)____ and (ii)____ of the fittest.

Accepted Answer

Statement (A) refers to convergent evolution, as the wings of butterflies and birds are analogous structures (similar function, different origin) . Statement (B) refers to Miller's experiment which used water vapour and observed the formation of amino acids . Statement (C) refers to the vermiform appendix, which is a vestigial organ (anatomical evidence). Statement (D) refers to Darwin's theory, which emphasized small variations (heritable) and survival of the fittest (natural selection), contrasting with de Vries' mutation theory , . Option 4 correctly fills the blanks for statements D and A.

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