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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 :

_____ Male
XX : Female


Answer :

XY
YY
XX
XXYY


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 :

A Mendelian experiment consists in breeding tall pea plants
bearing violet flowers with short pea plants bearing white
flowers. The progeny all bore violet flowers, but almost
half of them are short. This suggests that the genetic makeup
of the tall parent can be depicted as - [NCERT]


Answer :

TTWW
TTww
TtWW
TtWw


Question :

Which of the following is a recessive trait in garden pea
plant ?


Answer :

Wrinkled seeds
Round seeds
Oval seeds
Coloured seed coat


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Found to be out of date.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 :

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 :

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 :

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 :

Human offspring's sex is determined


Answer :

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


Question :

A cross between a tall plant (TT) and short pea plant (tt)
resulted in progeny that were all tall plants because


Answer :

tallness is the dominant trail
shortness is the dominant trait
tallness is the recessive trait
height of pea plant is not governed by gene T ' o r ' t '