A: Mesozoic is the era of dinosaurs,but they | vedclass

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(A) The Mesozoic era is indeed known as the 'Age of Reptiles' or the era of dinosaurs. They dominated the earth during this period and suddenly disapp

Vedclass · Accepted Answer

Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

Vedclass · Answer

(A) The Mesozoic era is indeed known as the 'Age of Reptiles' or the era of dinosaurs. They dominated the earth during this period and suddenly disappeared approximately $65$ million years ago.Scientific theories suggest that their extinction was likely caused by drastic climatic changes,such as the impact of a large asteroid or volcanic activity,which altered the environment significantly.While some evolutionary biologists propose that modern birds evolved from small theropod dinosaurs,this evolutionary transition is not the reason for their sudden mass extinction.Therefore,both the Assertion and the Reason are factually correct statements,and the Reason provides a plausible explanation for their disappearance.

Column $I$	Column $II$
$1$. August Weismann	$a$. Theory of origin of species
$2$. Hugo de Vries	$b$. Theory of chemical evolution
$3$. Charles Darwin	$c$. Theory of continuity of germplasm
$4$. Oparin and Haldane	$d$. Mutation theory

List $- I$	List $- II$
$(a)$ Adaptive radiation	$(i)$ Selection of resistant varieties due to excessive use of herbicides and pesticides
$(b)$ Convergent evolution	$(ii)$ Bones of forelimbs in Man and Whale
$(c)$ Divergent evolution	$(iii)$ Wings of Butterfly and Bird
$(d)$ Evolution by anthropogenic action	$(iv)$ Darwin Finches

$A$: Mesozoic is the era of dinosaurs,but they suddenly disappeared from the earth.
$R$: Dinosaurs may have changed into birds or climatic changes killed them.

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$A$: Mesozoic is the era of dinosaurs,but they suddenly disappeared from the earth.$R$: Dinosaurs may have changed into birds or climatic changes killed them.