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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 :

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 :

The more characteristics two species have in common


Answer :

More closely they are related and more recently they had a common ancestors.
More distantly they are related and more recently they have common ancestors.
More closely they are related and more distantly they have common ancestors
More distantly they are related and more distantly they have common ancestors.


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 :

Wild cabbage has evolved into new varieties like cabbage,
broccoli, and cauliflower by


Answer :

genetic drift
natural selection
reproductive isolation
artificial selection


Question :

The branch of biology that deals with transmission of
characters from one generation to other is termed as


Answer :

evolution
genetics
heredity
biogenetic law


Question :

Which prediction from the fossil record is in agreement
with the theory of evolution ?


Answer :

Unicellular organisms are first found in strata above multicellular fossils.
Land animals appear earlier than land plants in the fossil record.
Reptiles appear earlier ihan insects in the fossil record.
Prokaryote fossils appear earlier than eukaryote fossils.


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 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 :

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


Answer :

one
two
three
four


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