Assertion  : Primitive atmosphere was formed by the lightest atoms. Reason: The primitive atmosphere was reducing in nature.

Assertion  : Homologous organs have common ancestry and similar function. Reason: Analgous organs have unlike origin and dissimilar function.

Assertion  : Atavism is the reappearance of disappeared ancestral characters. Reason: Third molars and hair on body are examples of atavism.

Assertion  : Darwin?s finches show a variety of beaks suited for eating large seeds, flying insects and cactus seeds. Reason: Ancestral seed-eating stock of Darwin?s finches radiated out from South American mainland to different geographical areas of the Galapagos Islands, where they found competitor-free new habitats. [AIIMS 2005]

Assertion  : From evolutionary point of view, human gestation period is believed to be shortening. Reason : One major evolutionary trend in humans has been the larger head undergoing relatively faster growth rate in the foetal stage.[AIIMS 2004]

Which one of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters [CBSE PMT 1994; BHU 2000; MH CET 2003]

Which of the following adaptations help in evolution

The cells of bacterium Stanphylococcus remain arranged in the form of [BVP 2002]

What is the correct chronological sequence of human evolution

The early stage human embryo distinctly possesses [AIIMS 2003]

Branch of zoology dealing with similarities and differences between individuals related by descent is

Palynology is the study of [RPMT 1998]

The government sponsored programme for growing trees in towns and cities for aesthetic value is called [AMU 1999]

Molecules are always moving. Some molecules move faste than others,.........is a measure of their average velocity of movement  

Mixture of oil in water forms an emulsion. If a protein is shaken up with such an emulsion