121.  Cosmozoic theory was given by ______.

A. Darwin

B. Richter

C. Aristotle

D. Von Baer

Answer : Option C

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122.  Which one of the following phenomena supports Darwin’s concept of natural selection in organic evolution ?

A. Development of transgenic animals

B. Production of ‘Dolly’ the sheep by clothing

C. Prevalence of pesticide resistant insects

D. Development of organs from ‘stem cells’ for organ transplantation

Answer : Option B

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123.  Retrogressive evolution is shown by ______.

A. man

B. birds

C. tunicates

D. fish

Answer : Option A

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124.  

Match the correct set. 

Column I                          Column II 

I. Fossil                         A. 345-405 million years ago 

II. Devonian period      B. Fossillium

III. Cambrian period     C. 425-500 million years ago

IV. Ordovician period    D. 500-600 million years ago

A. I – B, II – A, III – D, IV – C

B. I – A, II – B, III – C, IV – D

C. I – B, II – C, III – D, IV – A

D. I – B, II – D, III – C, IV – A

Answer : Option A

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125.  

A. Genetic drift refers to change in allelic frequencies of a gene pool due to chance and occurs both
in large and small populations.
R. Small populations will, therefore, suffer more than larger ones.

A. If A and R both are true and R is correct explanation of A

B. If A and R both are true but R is not correct explanation of A

C. If A is true and R is wrong

D. If A is wrong and R is true

Answer : Option A

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126.  In a population, group of individuals of similar phenotypes are formed due to differential reproduction due to

A. genetic drift

B. natural selection

C. migration

D. selective hybridization

Answer : Option A

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127.  Phylogenetic evolution refers to

A. genetic relationship and evolutionary sequence

B. similar habitat

C. natural affinity of genes

D. similar character

Answer : Option C

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128.  Genetic drift occurs when few individuals of a colonize, the phenomenon is

A. bottleneck effect

B. assortative mating

C. founder’s effect

D. random mating

Answer : Option D

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129.  Sympatric speciation arises due to

A. non-overlapping population of the same area

B. geographical isolation

C. overlapping population of the same area

D. non-reproductive population of the same area

Answer : Option D

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130.  Hardy – Weinberg equilibrium is known to be effected by gene flow, genetic drift, mutation, genetic recombination and

A. evolution

B. limiting factor

C. saltation

D. natural selection

Answer : Option A

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