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CBSE Notes 2011-2012 » Heredity and Evolution - Class 10 Biology MCQs (Free Practice Test)

Heredity and Evolution - Class 10 Biology MCQs (Free Practice Test)


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A select subset of questions has been made available here.
You can use this for preparation purpose.
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Question :

A zygote which has an X-chromosome inherited from the
father will develop into a


Answer :

boy
girl
X-chromosome does not determine the sex of a child
either boy or girl


Question :

How was Mendel's work ultimately reconciled with
Darwin's theory of Natural Selection during the
evolutionary synthesis in the 1930s and 1940s ?


Answer :

Mendel's theory was replaced by the mutation theory.
It was recognised that much of the variation we observe in nature is due to recombination, rather than mutation.
Scientists recognised that once one thinks about species as populations, rather than individuals there is no incompatibility between them.
Both (b) and (c).


Question :

Select the correct statement:


Answer :

Tendril of a pea plant and phylloclade of Opuntia are homologous
Tendril of a pea plant and phylloclade of Opuntia are analogous
Wings of birds and limbs of lizards are analogous
Wings of birds and wings of bat are homologous


Question :

Two pink coloured flowers on crossing resulted in 1 red, 2
pink and 1 white flower progeny. The nature of the cross
will be


Answer :

double fertilisation
self-pollination
cross-fertilisation
no fertilisation


Question :

According to Darwin's theory of evolution, differences
between species may be the result of


Answer :

natural selection
mutagenic agents
the disuse of body structures.
the transmission of acquired characteristics.


Question :

Which of the following statements is not true with respect
to variation ?


Answer :

All variations in a species have equal chance of surviva
Change in genetic composition results in variation
Selection of variants by environmental factors forms the basis of evolutionary processes.
Variation is minimum in asexual reproduction


Question :

The sequence of events in geographic speciation is most
likely to be :


Answer :

Reproductive isolation
Geographic barrier
Genetic divergence
Genetic divergence


Question :

_____ Male
XX : Female


Answer :

XY
YY
XX
XXYY


Question :

A cross between tall pea plants with yellow seeds (Tt Yy)
and dwarf plants with green seeds (tt yy), progeny will
be


Answer :

Tall plants with yellow seeds and dwarf plants with green seeds.
Tall plants with yellow seeds and dwarf plants with yellow seeds.
All tall plants with yellow seeds.
Tall plants with yellow seeds, dwarf plants with yellow seeds, tall plants with green seeds and dwarf plants with green seeds.


Question :

A Mendelian experiment consists in breeding tall pea plants
bearing violet flowers with short pea plants bearing white
flowers. The progeny all bore violet flowers, but almost
half of them are short. This suggests that the genetic makeup
of the tall parent can be depicted as - [NCERT]


Answer :

TTWW
TTww
TtWW
TtWw