A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
Embryology is the study of development of animals from egg to adult. When we compare the development stages of starfish, a beetle, a fowl and a dog, all are found to be alike in the beginning through several stages up to gastrula. Later, the embryos being to diverge from each other. On the basis of the developmental history of the animals, Haeckel postulated his famous recapitulation theory or biogenetic law, i.e., ontogeny (embryogenic development of an organism) recapitulates phylogeny (evolutionary history of the race or phylum). This simply means that embryos in their development, repeat the evolutionary history of their ancestors in an abbreviated form. Therefore, early developmental stage of embryos are alike in different animals.
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