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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 :

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 :

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Found to be out of date.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 :

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 :

According to the evolutionary theory, formation of a new
species is generally due to


Answer :

sudden creation by nature
accumulation of variations over several generations
clones formed during asexual reproduction
movement of individuals from one habitat to another


Question :

was a predecessor of Darwin's and developed
the theory of acquired characteristics.


Answer :

Mendel
Lamarck
Weismann
Whittaker


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 :

To study the natural phenomenon of inheritance, Mendel
selected the pea plants. Which of the following properties
were suitable for their studies ? (i) Plants would easily self pollinate or cross pollinate
in nature.
(ii) Plants were easily grown in garden soil with a
considerably shorter generation time.
(iii) Pea plants do not require the true-breeding for
hybridisation experiments.
(iv) Many parts of the plant such as pod, seed, flower,
cotyledons showed distinct phenotypes..


Answer :

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


Question :

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


Answer :

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


Question :

Speciation is most likely to occur in a species with a number
of populations when there is a


Answer :

small population living in a niche with an environment like that of other population.
small population living in an isolated niche.
large population living in an isolated niche.
large population living in a niche with an environment like that of other populations.


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