(D) The $Mesozoic$ era is often called the 'Age of Reptiles'.Specifically,the $Jurassic$ period is known for the dominance of gymnosperms (like conife

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Gymnosperms were the dominant flora and the first birds appeared.

(D) The $Mesozoic$ era is often called the 'Age of Reptiles'.Specifically,the $Jurassic$ period is known for the dominance of gymnosperms (like conifers and cycads) as the primary flora.It is also the period during which the first birds (such as $Archaeopteryx$) appeared.Therefore,option $D$ is the correct description for the $Jurassic$ period.

Class 12 Biology Evolution A Brief Account of Evolution

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The $Jurassic$ period of the $Mesozoic$ era is characterized by:

A
Dominance of reptiles and origin of mammal-like reptiles.
B
Extinction of dinosaurs and origin of angiosperms.
C
Dominance of flowering plants and appearance of first dinosaurs.
D
Gymnosperms were the dominant flora and the first birds appeared.

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Class 12

Biology Questions

Chapter

Evolution

Subtopic

A Brief Account of Evolution

Match List-$I$ with List-$II$ with respect to the chronology of the evolution of life forms:
List-$I$ List-$II$
$A$. About $65 \text{ mya}$ $I$. Jawless fish probably evolved
$B$. About $500 \text{ mya}$ $II$. The dinosaurs suddenly disappeared from the earth
$C$. About $350 \text{ mya}$ $III$. Seaweeds and few plants probably existed
$D$. About $320 \text{ mya}$ $IV$. Invertebrates were formed and became active
Choose the correct answer from the options given below:

List-$I$	List-$II$
$A$. About $65 \text{ mya}$	$I$. Jawless fish probably evolved
$B$. About $500 \text{ mya}$	$II$. The dinosaurs suddenly disappeared from the earth
$C$. About $350 \text{ mya}$	$III$. Seaweeds and few plants probably existed
$D$. About $320 \text{ mya}$	$IV$. Invertebrates were formed and became active

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