- An Australian mole is actually a marsupial
rather than a placental animal like the North
American or European mole. The two
animals are similar in appearance because
(a) The selection pressures on both were
similar
(b) They have undergone a long period of
coevolution
(c) There are practically no placental
mammals in Australia
(d) Marsupials and placental mammals are
closely related
- Giraffes have long neck this length will not
further increase any more from generations
to generations this is because of natural
selection.
(a) Directional (b) stabilizing
(c) Disruptive (d) centrifugal
- “Frequency of resistant viruses increases in
population by using medication”. Mark the
best explanation regarding this statement
in the light of Lederberg – lederberg
experiment?
(a) Nature favours those characteristics
which provide advantage in the current
environment
(b) Drugs create resistant pathogens
(c) Nature selects resistant individuals that
are already present in population.
(d) Both (a) and (c)
- We know much about fossil fishes, snails
and corals but not much about ancient sea
weeds. Why do you suppose this is the case?
(a) A mass extinction wiped out the sea
weeds but animals survived.
(b) Plants moved onto land leaving only
animals in the sea.
(c) There were no sea weeds in the ancient
oceans.
(d) Sea weeds were too soft to fossilize well.
- Find the incorrect statement
(a) Evolution at genetic level like sickle cell
anemia is macroevolution
(b) Whales and seals do not contain gill slits
in adults as their adaptation to aquatic
life is secondary
(c) According to Darwin , any population
has built in variation in characteristics
(d) Darwin highlighted the importance of
small and gradual differences in
evolution, whereas devries focused an
abrupt and drastic changes an cause of
origin of species.
- Which of the following statement is false?
(a) Sympatric species originate by the
sudden development of reproductive
isolation between segments of a species
population due to sudden change in
their genotype.
(b) The sum total of genes of all the species
in an area constitutes the gene pool.
(c) The gene frequency refers to the
proportion of an allele in the gene pool
as compared with other alleles.
(d) Both (a) & (c)
- Selection will not eliminate a lethal
recessive allele from a large population of
diploid organisms because:
(a) Gene fixation will occur in the population
(b) Heterozygotes are at a selective
advantage
(c) The allele will have some good effects
and these will become dominant
(d) There will always be some heterozygote
carrier for the allele
- A potential damage to a population that
has been greatly reduced in number is the
(a) Loss of genetic variability
(b) Tendency towards assortative mating
(c) Reduced gene flow
(d) Hardy – Weinberg disequilibrium
- 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.
(a) i, ii, iii, iv (b) i, iii, ii, iv
(c) ii, iii, i, iv (d) ii, iii, iv, i
