1.
Human teeth and elephant’s tusk are
(a) Analogous
organs
(b) Vestigeal organs
(c) Homologous organs
(d) Rudimentary
organs
Answer: (c) Homologous organs
2.
Independent inheritance of two separate traits, shape and
colour of seeds in Mendel’s cross on pea plants resulted in a observable ratio
of:
(a) 3 : 1
(b) 9 : 3 : 3 : 1
(c) 1 : 1
(d) 9 : 4 : 2 :
1
Answer: (b) 9 : 3 : 3 : 1
3.
Which of these is not a vestigial organ in human beings?
(a) Appendix
(b) Wisdom tooth
(c) Nictitating membrane
(d) Gall
bladder
Answer: (d) Gall bladder
4.
Evolution of wild cabbage is an example of:
(a) Artificial
selection
(b) Natural selection
(c) Mutation
(d) Genetic
drift
Answer: (a) Artificial selection
5.
The modern day Human species has evolved from its earliest
ancestors who lived in:
(a) Asia
(b) Australia
(c) Africa
(d)
China
Answer: (c) Africa
6.
Two pink coloured flowers on crossing resulted in 1 red, 2
pink and 1 white flower progeny. The nature of the cross will be
(a) double
fertilisation
(b) self pollination
(c) cross fertilisation
(d) no
fertilisation
Answer: (b) self pollination
7.
Which of the following statement is incorrect?
(a) For
every hormone there is a gene.
(b) For every protein there is a gene.
(c)
For production of every enzyme there is a gene.
(d) For every molecule of fat
there is a gene
Answer: (d) For every molecule of fat there is a gene
8.
If a round, green seeded pea plant (RR yy) is crossed with
wrinkled, yellow seeded pea plant (rr YY), the seeds produced in F1 generation
are
(a) round and yellow
(b) round and green
(c) wrinkled and green
(d) wrinkled and yellow
Answer: (a) round and yellow
9.
In human males all the chromosomes are paired perfectly except
one. This/these unpaired chromosome is/are
(i) large chromosome
(ii) small
chromosome
(iii) Y-chromosome
(iv) X-chromosome
(a) (i) and (ii)
(b)
(iii) only
(c) (iii) and (iv)
(d) (ii) and (iv)
Answer: (c) (iii) and (iv)
10.
A zygote which has an X-chromosome inherited from the father
will develop into a
(a) boy
(b) girl
(c) X- chromosome does not
determine the sex of a child
(d) either boy or
girl
Answer: (b) girl
11.
New species may be formed if
(i) DNA undergoes significant
changes in germ cells
(ii) chromosome number changes in the gamete
(iii)
there is no change in the genetic material
(iv) mating does not take
place
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii), (iii) and (iv)
(d) (i), (ii) and (iii)
Answer: (a) (i) and (ii)
12.
Two pea plants one with round green seeds (RRyy) and another
with wrinkled yellow (rrYY) seeds produce F1 progeny that have round,
yellow (RrYy) seeds. When F1 plants are selfed, the F2
progeny will have new combination of characters. Choose the new combination from
the following:
(i) Round, yellow
(ii) Round, green
(iii) Wrinkled,
yellow
(iv) Wrinkled, green
(a) (i) and (ii)
(b) (i) and (iv)
(c)
(ii) and (iii)
(d) (i) and (iii)
Answer: (b) (i) and (iv)
13.
A basket of vegetables contains carrot, potato, radish and
tomato. Which of them represent the correct homologous structures?
(a) Carrot
and potato
(b) Carrot and tomato
(c) Radish and carrot
(d) Radish and
potato
Answer: (c) Radish and carrot
14.
If the fossil of an organism is found in the deeper layers of
Earth, then we can predict that
(a) the extinction of organism has occurred
recently
(b) the extinction of organism has occurred thousands of years
ago
(c) the fossil position in the layers of Earth is not related to its time
of extinction
(d) time of extinction cannot be
determined
Answer: (b) the extinction of organism has occurred thousands of years ago
15.
A trait in an organism is influenced by
(a) paternal DNA
only
(b) maternal DNA only
(c) both maternal and paternal DNA
(d)
neither by paternal nor by maternal DNA
Answer: (c) both maternal and paternal DNA
16.
Select the group which shares maximum number of common
characters.
(a) two individuals of a species
(b) two species of a
genus
(c) two genera of a family
(d) two genera of two
families
Answer: (a) two individuals of a species
17.
According to the evolutionary theory, formation of a new
species is generally due to
(а) sudden creation by nature
(b) accumulation
of variations over several generations
(c) clones formed during asexual
reproduction
(d) movement of individuals from one habitat to
another
Answer: (b) accumulation of variations over several generations
18.
Select the statements that describe characteristics of
genes
(i) genes are specific sequence of bases in a DNA molecule
(ii) a
gene does not code for proteins
(iii) in individuals of a given species, a
specific gene is located on a particular chromosome
(iv) each chromosome has
only one gene
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
Answer: (b) (i) and (iii)
19.
In peas, a pure tall plant (TT) is crossed with a short plant
(tt). The ratio of pure tall plants to short plants in F2 is
(a) 1
: 3
(b) 3 : 1
(c) 1 : 1
(d) 2 : 1
Answer: (c) 1 : 1
20.
Some dinosaurs had feathers although they could not fly but
birds have feathers that help them to fly. In the context of evolution this
means that
(a) reptiles have evolved from birds
(b) there is no
evolutionary connection between reptiles and birds
(c) feathers are
homologous structures in both the organisms
(d) birds have evolved from
reptiles
Answer: (d) birds have evolved from reptiles