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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 :

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 :

The theory of evolution of species by natural selection was
given by


Answer :

Mendel
Darwin
Morgan
Lamarck


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 :

Which group of organisms is believed to be among the
earliest to evolve on Earth ?


Answer :

Protozoans
Reptiles
Arthropods
Coelenterates


Question :

Natural selection is called 'survival of the fittest'. Which
of the following statements best describes an organism ?


Answer :

How strong it is compared to other individuals of the same species.
How much food and resources it is able to gather for its offspring.
The ability to adapt to the environment in the niche it occupies.
The number of fertile offspring it has.


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 :

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 :

f the fossil of an organism is found in the deeper layers of
earth, then we can predict that


Answer :

the extinction of organism has occurred recently
the extinction of organism has occurred thousands of years ago
the fossil position in the layers of earth is not related to its time of extinction
time of extinction cannot be determined


Question :

Speciation is the evolutionary process by which


Answer :

hybrid species form.
a new gene pool is formed.
shows up differences in physical traits.
evolutionary paths of species converge.


Question :

Exchange of genetic material takes place in


Answer :

vegetative reproduction
asexual reproduction
sexual reproduction
budding