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

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and reason are false

If the assertion is false but reason is true

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

If both the assertion and reason are false

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If the assertion is false but reason is true

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

If the assertion is true but the reason is false

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If both the assertion and reason are false

If the assertion is false but reason is true

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]

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and reason are false

If the assertion is false but reason is true

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]

If both the assertion and reason are false

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If the assertion is false but reason is true

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]

Lack of pigment in cave?dwelling animals

Melanization in peppered moth in industrial areas

Presence of webbed toes in acquatic birds

What is the correct chronological sequence of human evolution

Ramapithecus \[\to \] Australopithecus \[\to \] Homo erectus\[\to \] Neanderthal \[\to \] Homo sapiens sapiens

Ramapithecus [to ] Homo habilis [to ] Homo sapiens sapiens [to ] Homo erectus

Australopithecus[to ] Ramapithecus[to ]Homo habilis [to ] Homo sapiens sapiens

Homo habilis [to ] Australopithecus [to ] Homo erectus [to ] Homo sapiens sapiens

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