Which of the following is not a major evolutionary trend seen in the evolution of horse?
Progressive increase in the number of toes
Increase in the complexity of the molar teeth
Lengthening of the limbs in general
Enlargement of the brain
Identify the correct statement:
As the coacervates do not have lipid outer membranes and cannot reproduce, they alone could not have been the precursors of life.
The microspheres could not be induced to constrict but had no large amount of diversity
The earliest life was probably not driven by the solar energy as is seen today
Protobionts cannot separate combination of molecules from the surroundings or maintain an internal environment but are able to reproduce.
Which one of the following is regarded as the direct ancestor of modern man?
Homo erectus
Ramapithecus
Homo habilis
Cro-magnon man
Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
Overproduction, variations, constancy of population size, natural selection
Variations, constancy of population size, overproduction, natural selection
Overproduction, constancy of population size, variations, natural selection
Industrial melanism is an example of
defensive adaptation of skin against ultraviolet radiations
drug resistance
directional selection due to smoke from industries
protective resemblance with the surroundings
The homologous organs are those that show similarity in
size
origin
function
apprearance
The occurrence of endemic species in South America and Australia is due to
Extinction of these species from other regions
Continental separation
No terrestrial route to these places
Retrogressive evolution
Genetic drift is change of
gene frequency in same generation
appearance of recessive genes
gene frequency from one generation to next
None of the above
Thorn of Bougainvillea and tendril of Cucurbita are examples of
homologous organs
vestigial organs
retrogressive evolution
Adaptive radiation refers to
adaptations due to geographical isolation
evolution of different species from a common ancestor
migration of members of a species to different geographical areas
power of adaptation in an individual to a variety of environments
Random genetic drift in a population probably results from
large population size
highly genetically variable individuals
interbreeding within small isolated population
constant low mutation rate
Which one of the following features is closely related with the evolution of humans?
Loss of tail
Shortening of jaws
Binocular vision
Flat nails
Homo sapiens evolved during
Pleistocene
Oligocene
Pliocene
Miocene
Identify the correct sequence in which the following substances have appeared during the course of evolution of life on earth.
glucose, amino acids, nucleic acids, proteins
ammonia, amino acids, proteins, nucleic acids
water, amino acids, nucleic acids, enzymes
amino acids, ammonia, phosphates, nucleic acids
In which condition the gene ratio remains constant for any species?
Sexual selection
Random mating
Mutation
Gene flow
Darwin's theory of pangenesis shows similarity with theory of inheritance of acquired characters then what will be correct according to it?
Useful organs become strong and developed while useless organs become extinct. These organs help in struggle for survival
Size of organs increase with ageing
Development of organs is due to will power
There should be some physical basis of inheritance
Presence of gills in the tadpole of frog indicates that
fishes were amphibian in the past
fishes evolved from frog-like ancestors
frogs will have gills in future
frogs evolved from gilled ancestors
'Golden age of dinosaurs'/Age of reptiles was
Mesozoic
Coenozoic
Palaeozoic
Psychozoic
Reason of diversity in living being is
mutation
gradual change
long term evolutionary change
short term evolutionary change
Which of following is closest relative of man?
Chimpanzee
Gorilla
Orangutan
Gibbon
When two species of different geneology come to resemble each other as a result of adaptation, the phenomenon is termed
divergent evolution
micro-evolution
co-evolution
convergent evolution
Theory of natural selection dwells on
role of environment in evolution
natural selection acting on favourable variations
changes in gene complex resulting in heritable variations
Adenine was synthesized by Orgel, using the Miller apparatus, when he used the gas:
carbon dioxide
hydrogen cyanide
hydrogen sulfide
nitrogen
Which one of the following options gives one correct example each of convergent evolution and divergent evolution?
The extinct human who lives 100000 to 40000 years ago, in Europe, Asia and parts of Africa, with short stature, heavy eye brows, retreating fore heads, large jaws with heavy teeth, stocky bodies, a lumbering gait and stooped posture was
Neanderthal human
Cro-magnon humans
Parallelism is
The concept of chemical evolution is based on
crystallization of chemicals
interaction of water, air, and clay under intense heat
effect of solar radiation on chemicals
the possible origin of life by the combination of chemicals under suitable environmental conditions
One of the important consequences of geographical isolation is
no change in the isolated fauna
preventing speciation
speciation through reproductive isolation
random creation of new species
Which one of the following describes correctly the homologous structures?
Organs appearing only in embryonic stage and disappearing later in the adult
Organs with anatomical similarities, but performing different functions
Organs with anatomical dissimilarities, but performing same functions
Organs that have no function now, but had an important function in ancestors
'Continuity of germplasm' theory was given by
De Vries
Weismann
Darwin
Lamarck
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