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

42.

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

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