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81.

Mutations in a population:

A.	Always led to evolution	B.	Never led to evolution
C.	Often led to evolution	D.	Led to none of these

82.

Palaeozoic era does not include:

A.	Cambrian period	B.	Ordovician period
C.	Triassic period	D.	Silurian period

83.

Dominant protozoans during proterozoic era were:

A.	Radiolarians	B.	Mastigophores
C.	Ciliates	D.	Sarcodines

84.

Trilobites and Brachiopods were dominant during:

A.	Cambrian period	B.	Silurian period
C.	Devonian period	D.	Permian period

85.

Cephalopod Molluscs were dominant during:

A.	Cambrian period	B.	Ordovician period
C.	Silurian period	D.	Permian period

86.

Chordates as lower fishes in fresh water appeared in:

A.	Cambrian period	B.	Silurian period
C.	Ordovician period	D.	Permian period

87.

Terrestrial Colonization started during:

A.	Ordovician period	B.	Silurian period
C.	Permian period	D.	Cambrian

88.

The fishes dominated during:

A.	Ordovician period	B.	Silurian period
C.	Permian period	D.	Devonian period

89.

Amphibians were at climax during:

A.	Silurian period	B.	Devonian period
C.	Carboniferous period	D.	Permian period

90.

Reptiles dominated during:

A.	Mesozoic era	B.	Cenozoic era
C.	Paleozoic era	D.	Proterozoic era