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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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Question :

Heredity or inheritance of specific traits became clearer
due to


Answer :

Darwinism
Neo-Darwinism
Mendel's work on garden peas
Lamarck's theory


Question :

One of the following is a correct statement:


Answer :

Dominant trait cannot be expressed in heterozygous condition.
Dominant trait is expressed in homozygous condition.
Recessive trait can only be expressed in homozygous condition
Recessive trait can always be expressed in heterozygous condition.


Question :

Select the group which shares maximum number of
common characters:


Answer :

Two individuals of a species
Two species of a genus
Two genera of a family
Two genera of two families


Question :

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


Answer :

Reproductive isolation
Geographic barrier
Genetic divergence
Genetic divergence


Question :

Human offspring's sex is determined


Answer :

through father's sex chromosomes.
through mother's sex chromosomes.
by hormones.
by enzymes.


Question :

Exchange of genetic material takes place in


Answer :

vegetative reproduction
asexual reproduction
sexual reproduction
budding


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 :

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


Answer :

(i) and (ii)
(i) and (iv)
(ii) and (iii)
(i) and (iii)


Question :

In peas, a pure tall plant (TT) is crossed with a short plant
(tt). The ratio of pure tali plants to short plants in F2 is


Answer :

1:3
3:1
1:1
2:1


Question :

A cross between a tall plant (TT) and short pea plant (tt)
resulted in progeny that were all tall plants because


Answer :

tallness is the dominant trail
shortness is the dominant trait
tallness is the recessive trait
height of pea plant is not governed by gene T ' o r ' t '