(B) The dinosaurs originated during the $Triassic$ period of the $Mesozoic$ era.While the $Jurassic$ period is often associated with the dominance of

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(B) The dinosaurs originated during the $Triassic$ period of the $Mesozoic$ era.While the $Jurassic$ period is often associated with the dominance of dinosaurs,their actual evolutionary origin dates back to the $Triassic$ period,approximately $230$ to $240$ million years ago.

Class 12 Biology Evolution A Brief Account of Evolution

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During which geological period did the dinosaurs originate?

A
Permian
B
Triassic
C
Jurassic
D
Cretaceous

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Class 12 Questions

Class 12

Biology Questions

Chapter

Evolution

Subtopic

A Brief Account of Evolution

The first mammals were similar to which of the following?

Easy

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Identify the organism based on the following characteristics:
- They were land reptiles.
- They had huge, fearsome, dagger-like teeth.

Medium

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During which period did the first modern birds appear?

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Prototherians have evolved from

Medium

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Match the following geological eras in Column $A$ with their respective time periods in Column $B$ and key evolutionary events in Column $C$. Which of the following is the correct match?
Column $A$ Column $B$ and $C$
$i$. Cenozoic $2-65 \ \text{mya}$,Origin of vertebrates
$ii$. Palaeozoic $500-165 \ \text{mya}$,Rise of egg-laying mammals
$iii$. Mesozoic $135-225 \ \text{mya}$,Reptiles dominant
$iv$. Proterozoic $350-500 \ \text{mya}$,Trilobites dominant

Column $A$	Column $B$ and $C$
$i$. Cenozoic	$2-65 \ \text{mya}$,Origin of vertebrates
$ii$. Palaeozoic	$500-165 \ \text{mya}$,Rise of egg-laying mammals
$iii$. Mesozoic	$135-225 \ \text{mya}$,Reptiles dominant
$iv$. Proterozoic	$350-500 \ \text{mya}$,Trilobites dominant

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