In which condition the gene ratio remains constant for any species?

1. Sexual selection

2. Random mating

3. Mutation

4. Gene flow

Darwin's theory of pangenesis shows similarity with theory of inheritance of acquired characters then what will be correct according to it?

1. Useful organs become strong and developed while useless organs become extinct. These organs help in struggle for survival

2. Size of organs increase with ageing

3. Development of organs is due to will power

4. There should be some physical basis of inheritance

Presence of gills in the tadpole of frog indicates that

1. fishes were amphibian in the past

2. fishes evolved from frog-like ancestors

3. frogs will have gills in future

4. frogs evolved from gilled ancestors

'Golden age of dinosaurs'/Age of reptiles was

1. Mesozoic                                 

2. Coenozoic  

3. Palaeozoic                                 

4. Psychozoic  

Reason of diversity in living being is

1. mutation 

2. gradual change

3. long term evolutionary change

4. short term evolutionary change

Which of following is closest relative of man?

1. Chimpanzee 

2. Gorilla

3. Orangutan

4. Gibbon

When two species of different geneology come to resemble each other as a result of adaptation, the phenomenon is termed

1. divergent evolution

2. micro-evolution

3. co-evolution

4. convergent evolution

Theory of natural selection dwells on 

1. role of environment in evolution

2. natural selection acting on favourable variations

3. changes in gene complex resulting in heritable variations

4. None of the above

Which one of the following options gives one correct example each of convergent evolution and divergent evolution?

The extinct human who lives 100000 to 40000 years ago, in Europe, Asia and parts of Africa, with short stature, heavy eye brows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was

1. Homo habilis                           

2. Neanderthal human

3. Cro-magnon humans               

4. Ramapithecus