ChApTEr-7 : EVOLUTIOn
Multiple Choice Questions
- In a population of 1000 individuals, 360 belong 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
(a) 0.4 (b) 0.5 (c) 0.6 (d) 0.7.
- Choose the wrong statement.
(a) Louis Pasteur demonstrated that life comes only
from pre-existing life.
(b) S.L. Miller observed that electric discharge in a
flask containing CH 4 , H 2 , NH 3 and water vapour
at 800° C formed amino acids.
(c) Flippers of penguins and dolphins are examples
of homology.
(d) Analogous structures are the result of convergent
evolution.
- According to Darwin, organic evolution is mainly due to
(a) competition within closely related species
(b) reduced feeding efficiency in one species due to
the presence of interfering species
(c) intraspecific competition
(d) interspecific competition.
- Random unidirectional change in allele frequencies
that occurs by chance in all populations and especially
in small populations is known was
(a) migration (b) natural selection
(c) genetic drift (d) mutation.
- The extinct human ancestor, whose fossil was
discovered by Edward Lewis from Pliocene rocks of
Shivalik Hills of India was
(a) Ramapithecus (b) Australopithecus
(c) Dryopithecus (d) Homo erectus.
- Which one of the following options gives one correct
example each of convergent evolution and divergent
evolution?
Convergent Divergent evolution
evolution
(a) Eyes of octopus and Bones of forelimbs of
mammals vertebrates
(b) Thorns of Bougainvillea Wings of butterflies and
and tendrils of Cucurbita birds
(c) Bones of forelimbs of Wings of butterfly and
vertebrates birds
(d) Thorns of Bougainvillea^ Eyes of octopus and
and tendrils of Cucurbita mammals.
- Populations are said to be allopatric when
(a) they are physically isolated by natural barriers
(b) they are sharing the same area but cannot
interbreed
(c) they live together and breed freely to produce
viable offspring
(d) they are isolated but often come together for
breeding.
- The first life on earth consisted of
(a) provirus (b) protovirus
(c) virus (d) bacteria.
- Adaptive radiation refers to
(a) evolution of different species from a common
ancestor
(b) migration of members of a species to different
geographical areas
(c) power of adaptation in an individual to a variety
of environments
(d) adaptations due to geographical isolation.
- An important evidence in favour of organic evolution
is the occurrence of
(a) homologous and analogous organs
(b) homologous and vestigial organs
(c) analogous and vestigial organs
(d) homologous organs only.
- Following table shows data on amino acid substitution
in the a chain of haemoglobin in four different
mammalian species A, B, C and D. On the basis of the
data shown in the table, choose the most appropriate
evolutionary tree from those given below.
Comparison
of Species
Number of Amino Acid
Substitution
A and B 19
B and C 26
A and C 27
D and C 27
A and D 20
D and B 1
(a)
(b)
(c)
(d)
