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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 : Closely related species have few characteristics in
common.
B : Interbreeding among individuals of different
populations of a species maintains a free flow of genes
in these populations.


Answer :

'A' Right, 'B' Right
'A' Right, 'B' Wrong
A' Wrong, 'B' Right
'A' Wrong, 'B' Wrong


Question :

Which of these is homozygous recessive ?


Answer :

s
ss
Ss
SS


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 :

Which one provides correct sequence of events in origin
of new species according to Darwinism ?
(i) Natural selection
(ii) Variation and their inheritance
(iii) Survival of the fittest
(iv) Struggle for existence


Answer :

(i), (ii), (iii) and (iv)
(ii), (iii), (i) and (iv).
(iii), (iv), (i) and (ii)
(iv), (ii), (iii) and (i)


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 :

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


Answer :

reptiles have evolved from birds
there is no evolutionary connection between reptiles and birds
feathers are homologous structures in both the organisms
birds have evolved from reptiles


Question :

speciation takes place when variation occurs with


Answer :

death of an organism.
mood changes
geographical isolation.
changes due to accidents.


Question :

The variation of natural selection operates due to random
mutations. What does this imply about natural selection ?


Answer :

There is no possibility that God could be involved in this process.
Natural selection is a random process.
Natural selection is a direct process in which one variant will be favoured in a given environment over another.
(a) and (b).


Question :

Differences between organisms in a species are described
as variation. Which of the following would you describe
as continuous variation ?


Answer :

Hair colour
Eye colou
Weight
Sex


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.