Reptilian ancestors of the mammals were the :-
Given below is the representative evolutionary history of vertebrates through geological periods. A, B, C, and D respectively are :
Lamarck's theory of evolution is also called
Theory of special creation
Inheritance of acquired characters
Survival of the fittest
None of these
Industrial melanism is an example of
Neo Darwinism
Natural selection
Mutation
Neo Lamarckism
Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?
Transduction
Chromosomal aberrations
Genetic drift
Recombination
What is common to whale, seal and shark?
Seasonal migration
Thick subcutaneous fat
Convergent evolution
Homeothermy
Artificial selection to obtain cows yielding high milk output represents
Stabilising selection as it stabilizes this character in the population
Directional as it pushes the mean of the character in one direction
Disruptive as it spills the population into two, one yielding higher output and the other lower output
Stabilizing followed by disruptive as it stabilizes the population of producing higher yielding cows
In Hardy- Weinberg equation, the frequency of heterozygous individual is represented by
P2
2pq
pq
q2
Which of the following is the correct sequence of events in the origin of life?
I. Formation of protobionts,
II. Synthesis of organic monomers.
III. Synthesis of organic polymers.
IV. Formation of DNA-based genetic systems.
I,II,III,IV
I,III,II,IV
II,III,I,IV
II,III,IV,I
Analogous structures are a result of
shared ancestry
stabilising selection
divergent evolution
Which of the following structures is homologous to the wing of a bird?
Wing of a moth
Hind limb of rabbit
Flipper of whale
Dorsal fin of a shark
Following are the two statements regarding the origin of life
I. The earliest organisms that appeared on the earth were non-green presumably
anaerobes.
II. The first autotrophic organisms were the chemoautotrophs that never released
oxygen.
Of the above statements which one of the following options is correct?
II is correct but I is false
Both I and II are correct
Both I and II are false
I is correct but II is false
The wings of a bird and the wings of an insect are
homologous structures and represent divergent evolution
analogous structures and represent convergent evolution
phylogenetic structures and represent divergent evolution
homologous structures and represent convergent evolution
Which of the following are most suitable indicators of SO2 pollution in the environment?
Lichens
Conifers
Algae
Fungi
Which of the following had the smallest brain capacity?
Homo erectus
Homo sapiens
Homo neanderthalensis
Homo habilis
A population will not exist in Hardy-Weinberg equilibrium if
individuals mate selectively
there are no mutations
there is no migration
the population is large
A location with luxuriant growth of lichens on the trees indicates that the:-
trees are very healthy
trees are heavily infested
location is highly polluted
location is not polluted
In a population of 1000 individuals 360 belongs to genotype AA, 480 to Aa and the
remaining 160 to aa. Based on this data, the frequency of allele A in the population is
0.4
0.5
0.6
0.7
Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and
forelimbs of bats used in flying are an example of
analogous organs
adaptive radiation
homologous organs
convergent evolution
Which one of the following are analogous structures?
Wings of bat and wings of pigeon
Gills of prawn and lungs of man
Thorns of Bougainvillea and tendrils of Cucurbita
Flippers of dolphin and legs of horse
The process by which organisms with different evolutionary history evolve similar
phenotypic adaptations in response to a common enviroment challenge, is called
natural selection
non-random evolution
The tendency of population to remain in genetic equilibrium may be disturbed by
random mating
lack of migration
lack of mutations
lack of random mating
The eyes of Octopus and eyes of cat show different patterns of structure, yet they
perform similar function. This is an example of
homologous organs that have evolved due to convergent evolution
homologous organs that have evolved due to divergent evolution
analogous organs that have evolved due to convergent evolution
analogous organs that have evolved due to divergent evolution
What is true about the isolated small tribal populations?
There is a decline in population as boys marry girls only from their own tribe.
Hereditary diseases like colourblindness do not spread in the isolated population.
Wrestlers who develop strong body muscles in their life time pass this character on to their progeny.
There is no change in population size as they have a large gene pool.
Among the human ancestors the brain size was more than 1000 cc in:
Ramapithecus
Industrial melanism as observed in peppered moth proves that :
the true black melanic forms arises by a recurring random mutation.
The melanic form of the moth has no selective advantage over lighter form in industrial area
The lighter-form of the moth has no selective adavantage either in polluted industrial area or non-polluted area
Melanism is a pollution- generated feature.
If the mean and the median pertaining to a certain character of a population are of the
same value, the following is most likely to occur:
a normal distribution
a bi-modal distribution
a T-shaped curve
a skewed curve
Jurassic period of the Mesozoic era is characterized by:
gymnosperms are dominant plants and first birds appear
radiation of reptiles and origin of mammal-like reptiles
dinosaurs become extinct and angiosperms appear
flowering plants and first dinosaurs appear
The slow process by which new types of organism arise from existing forms by genetic
variation is called
Hybridisation
Evolution
Transformation
Study of fossils is called
ecology
angiology
exobiology
none of these
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