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21.

Which of the following eras in geological time-scale corresponds to the period when life had nnot originated on earth:

A.	Azoic	B.	Archaeozoic
C.	Palaeozoic	D.	Coenozoic

22.

In geological history of the earth, the beginning of birds and mammals occurred in:

A.	Carboniferous and Permian Period	B.	Jurassic period
C.	Silurian and Devonian period	D.	Eocene and Oligocene Period

23.

The feature which enabled reptile to dominate earth's fauna for 100 million years was their:

A.	Large lungs	B.	Heavy armour
C.	Big teeth	D.	Shelled eggs

24.

Age of fossils can be estimated now by:

A.	Earth's crest	B.	Remaining quantity of radioactive carbon in relevant rocks
C.	X-rays	D.	Chemical analysis

25.

Dinosaurs originated:

A.	Long before mammals	B.	With mammals
C.	Before mammals and gave rise to them	D.	Sometimes after mammals

26.

Mesozoic Era in geological history of earth is specially called the age of:

A.	Primitive man	B.	Amphibians
C.	Ruling reptiles	D.	Armoured fishes

27.

Which of the following periods does not belong to Mesozoic Era:

A.	Cretaceous	B.	Jurassic
C.	Triassic	D.	Ordovician

28.

Coenozoic Era has periods namely:

A.	Cretaceous, Jurassic and Triassic	B.	Quarternary, Tertiary
C.	Devonian, Silurian, Ordovician	D.	Premian, Carboniferous, Cambrian

29.

Evolutionary history of an organisms is called:

A.	Geriohtology	B.	Genealogy
C.	Genetics	D.	None of these

30.

In which of the following periods, chordates originated:

A.	Ordovician	B.	Cambrian
C.	Devonian	D.	Cambrian