The best description of natural selection is 

(1) the survival of the fittest

(2) the struggle for existence 

(3) the reproductive success of the members of a population best adapted to the environment

(4) a change in the proportion of variation within a population 

Subtopic:  Darwin's Theory |
 66%
From NCERT
AIIMS - 2017
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Reproduction isolation in sympatric speciation develops without a 

(1) Geographic barrier

(2) Barrier to gene flow

(3) Change in chromosome number

(4) Barrier to mating

Subtopic:  Concept of Speciation |
 58%
AIIMS - 2016
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Which of the following sets do not have homologous organs? 

(1) Mouth parts of cockroach and butterfly

(2) Wings of butterfly and bird

(3) Wings of mosquito and butterfly 

(4) Forelegs of horse and paddles of whale

Subtopic:  Concept of Organic Evolution: Evidence: 1 | Concept of Organic Evolution: Evidence |
 70%
From NCERT
AIIMS - 2016
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Which of the following is the relatively most accurate method for dating fossils?

(1) Pottasium-argon method

(2) Uranium-lead method

(3) Electron-spin resonance method

(4) Radio-carbon method

Subtopic:  Palentological Evidences of Evolution |
 55%
AIIMS - 2015
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At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a randomly mating population of equilibrium ?

(1) 0.16

(2) 0.36

(3) 0.48

(4) 0.24

Subtopic:  Hardy Weinberg Law: 1 | Hardy Weinberg Law: 2 | Hardy Weinberg Law |
 81%
AIIMS - 2014
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Speciation of sympatric species is due to

(1) geographic isolation

(2) reproductive isolation

(3) isolation/separation

(4) migration

Subtopic:  Concept of Speciation |
 59%
AIIMS - 2013
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Flame cells and Malpighian tubules are the analogous organ in 

(1) insects and arthropods respectively 

(2) arthropods and echinodermates respectively

(3) helminths and arthropods with other insect respectively

(4) arthropds and other insect with helminths respectively

 72%
AIIMS - 2013
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Tendrils in plants are an exapmle of 

(1) Convergent evolution

(2) Radiation

(3) Divergent evolution

(4) Co-evolution 

Subtopic:  Concept of Organic Evolution: Evidence: 1 | Concept of Organic Evolution: Evidence |
 78%
From NCERT
AIIMS - 2012
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Basis of life are 

(1) nucleic acids

(2) proteins

(3) nucleoproteins

(4) amino acids

Subtopic:  Origin of Life: Chemical Evolution: 1 | Origin of Life: Chemical Evolution: 2 | Origin of Life |
 76%
AIIMS - 2011
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Theory of 'Saltations' was given by 

(1) G Mendel

(2) Hugo de Vries

(3) J B S Haldane

(4) H J Miller

Subtopic:  Hugo De Vries Theory of Evolution |
 93%
From NCERT
AIIMS - 2011
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