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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 :

The number of pair (s) of sex chromosomes in the zygote
of humans is


Answer :

one
two
three
four


Question :

What is the difference between genetic drift and change
due to natural selection ?


Answer :

Genetic drift does not require the presence of variation.
Genetic drift never occurs in nature, natural selection does.
Genetic drift does not involve competition between members of a species.
There is no difference.


Question :

How did people respond to Mendel's ideas on inherited
traits ?


Answer :

Immediately accepted by his peers.
Found to be out of date.
Thought to be far ahead of their time.
Not recognised for more than thirty years.


Question :

Human offspring's sex is determined


Answer :

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


Question :

The maleness of a child is determined by


Answer :

the X chromosome in the zygote
the Y chromosome in zygote
the cytoplasm of germ cell which determines the sex
sex is determined by chance


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 :

An example of homologous organs is [NCERT]


Answer :

our arm and a dog's foreleg
our teeth and an elephant's tusks
potato and runners of grass
all of the above.


Question :

Why is the advent of reproductive isolation important from
an evolutionary point of view ?


Answer :

Reproductive isolation increases the mutation rate.
Reproductive isolation may slow reproduction.
When the organisms comprising two populations of a species can no longer interbreed, the flow of genetic material between them stops.
It is not important from an evolutionary point of view.


Question :

Which of the following statement is incorrect ?


Answer :

For every hormone there is a gene.
For every protein there is a gene.
For production of every enzyme there is a gene.
For every molecule of fat there is a gene.


Question :

A basket of vegetables contains carrot, potato, radish and
tomato. Which of them represent the correct homologous
structures ?


Answer :

Carrot and potato
Carrot and tomato
Radish and carrot
Radish and potato