Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?                                                                                
1. Variations, natural selection, overproduction, constancy of population size

2. Overproduction, variations, constancy of population size, natural selection 

3. Variations, constancy of population size, overproduction, natural selection

4. Overproduction, constancy of population size, variations, natural selection

Industrial melanism is an example of 

1. defensive adaptation of skin against ultraviolet radiations

2. drug resistance

3. directional selection due to smoke from industries

4. protective resemblance with the surroundings

The homologous organs are those that show similarity in

1. size

2. origin

3. function

4. appearance 

The occurrence of endemic species in South America and Australia is due to  

1. Extinction of these species from other regions

2. Continental separation

3. No terrestrial route to these places

4. Retrogressive evolution 

Genetic drift is change of 

1. gene frequency in same generation 

2. appearance of recessive genes

3. gene frequency from one generation to next 

4. None of the above

Thorn of Bougainvillea and tendril of Cucurbita are examples of  
1. analogous organs

2. homologous organs

3. vestigial organs

4. retrogressive evolution 

Adaptive radiation refers to

1. adaptations due to geographical isolation 

2. evolution of different species from a common ancestor

3. migration of members of a species to different geographical areas

4. power of adaptation in an individual to a variety of environments

Homo sapiens evolved during

1. Pleistocene 

2. Oligocene

3. Pliocene 

4. Miocene

Identify the correct sequence in which the following substances have appeared during the course of evolution of life on earth.

1. glucose, amino acids, nucleic acids, proteins

2. ammonia, amino acids, proteins, nucleic acids

3. water, amino acids, nucleic acids, enzymes

4. amino acids, ammonia, phosphates, nucleic acids

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

1. Sexual selection

2. Random mating

3. Mutation

4. Gene flow