Jurassic period of the Mesozoic era is characterised by

• gymnosperms are dominant plants and first birds appear

• radiation of reptiles and origin of mammal like reptiles

• dinosaurs become extinct and angiosperms appear

• dinosaurs become extinct and angiosperms appear

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

• Only daughters

• Only sons

• Both sons and daughters

• Only grandchildren

According to Hugo de Vries, the mechanism of evolution is

• Multiple step mutations

• Saltation

• Minor mutations

• Phenotypic variations

Among the following sets of examples for divergent evolution, select the incorrect option :

• Forelimbs of man, bat and cheetah

• Heart of bat, man and cheetah

• Eye of octopus, bat and man

• Brain of bat, man and cheetah

The similarity of bone structure in the forelimbs of many vertebrates is an example of

• Homology

• Analogy

• Adaptive radiation

• Convergent evolution

The appearance of antibiotic-resistant bacteria is an example of

• adaptive radiation

• transduction

• Pre-existing variation

• divergent evolution in the population

47.

Which one of the following graphs correctly describes disruptive selection? When studying fitness level associated with body size?

• 

• 

• 

• 

Ancestor of man who first stood erect was

• Australopithecus

• Cro-magnon

• Java-ape man

• Peaking man

Origin of life occurred in

• Precambrian

• Coenozoic

• Palaeozoic

• Mesozoic

The most recent and direct pre-historic ancestor is

• Cro-magnon

• Neanderthal

• Pre-neaderthal

• None of these