Heredity and Evolution

Homologous organs are ____.

Correct! Wrong!

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Homologous organs are similar in origin with dissimilar functions. Example: wing of an insect and forelimbs of a horse.

The resemblence between grandparents and their grandchildren is due to ____.

Correct! Wrong!

Children tend to resemble parents, grandparents and persons of earlier generations. The similarities are not due to coincidence but rather due to inheritance or heredity.

Organic evolution is ____.

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Organic evolution is a continuous process of generation and shaping of diversity in any species.

Males have half the sperms with the X chromosomes and the other half with Y chromosome.

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Males have half the sperms with the X chromosomes and the other half with Y chromosome.

The difference in the characters (or traits) among the individuals of a species is called ____.

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Variation is the differences in the characters (or traits) among the individuals of a species .

Ratio 9:3:3:1 refers to ____.

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Dihybrid cross gives a phenotypic ratio of 9:3:3:1.

Extinct forms like dinosaurs are better understood by ____.

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Fossils are the documentary evidences of organic evolution.

The idea of spontaneous generation was refuted finally by the experiments of ____.

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According to spontaneous generation, life originates on its own. An experiment conducted by Pasteur finally negated the theory of spontaneous generation.

Complex organisms are formed from simple forms. This is known as ____.

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Complex organisms evolve from simple forms known as organic evolution. All the living organisms of today are modified descendants of the past.

____ slow down the action of decomposers during the formation of fossils.

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Sand and silt cover the remains of plants and animals. They slow down the action of decomposers, thereby slowing down the process of fossilization.

The cause of variations in clones are ____.

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Causes of variations in clones are mutations, inaccuracies during DNA copying and acquired variations

The first photosynthetic organisms on earth were ____.

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Cyanobacteria are the first photosynthetic organisms on the earth.

The heredity determiners called 'genes' are located on ____.

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Genes are located on chromosomes and they are responsible for heredity.

Which of the following is not a vestigial organ in humans?

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Premolar tooth is not a vestigial organ in humans.

Divergent evolution refers to ____.

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Divergent evolution refers to anatomical similarity but functional dissimilarity.

The origin of life occurred in ____.

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Life originated in the aquatic medium in the form of prokaryotes.

The inheritance of two pairs of contrasting characteristics at the same time is called ____.

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The inheritance of two pairs of contrasting characteristics at the same time is called Dihybrid inheritance.

In human beings, vestigial organs are ____.

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In human beings, vestigial organs are wisdom tooth, coccyx, vermiform appendix, nictitating membrane, auricular muscles.

Which of the following plants was selected for Mendel's famous experiment on inheritance?

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Mendel selected garden pea plant for his experiment on inheritance.

The expression 'survival of the fittest' was coined by ____.

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The expression survival of the fittest was coined by H. Spencer, however it is explained by Darwin.

____ is Palaeontology.

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Study of fossils or preserved remains of plants and animals is called Palaeontology.

Heterozygous condition in a gamete is due to the presence of ____.

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Presence of X and Y chromosomes in a gamete is called a heterozygous condition.

Natural selection is done by human beings.

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In a real sense, only nature selects the best adapted varieties to survive and reproduce. This process is known as natural selection.

The ancestor of cauliflower, broccoli and kale is ____.

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Cauliflower, broccoli and kale descended from wild cabbage.

The raw materials for evolution come from ____.

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Mutations are the raw materials for evolution.

Which of the following is responsible to produce a male child?

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Y chromosome is responsible to produce a male child.

Choose the correct sequence of formation of chemicals on early earth ____.

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The sequence in which the chemicals are formed on earth are ammonia, water, nucleic acids and proteins.

In a monohybrid cross, the genotypic ratio of off springs is ____.

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In a monohybrid cross, the genotypic ratio of off springs is 1:2:1.

Incomplete polypeptide is formed by ____.

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The recessive gene forms an incomplete or defective polypeptide or enzyme and therefore fails to express its effect.

Wings of bat, locust and pigeon are example of ____.

Correct! Wrong!

Wings of bat, locust and pigeon are examples of analogous organs. The organs with different origin and similar functions are known as analogous organs.

CBSE Class 10th Science 9 - Heredity and Evolution MCQs
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