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Zoology MCQs for NEET — Practice Questions with Answers

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Theory of 'Saltations' was given by

G Mendel

Hugo de Vries

J B S Haldane

H J Miller

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Explanation

Mutations were referred to as 'Saltations' or sports by Hugo de Vries. Therefore, theory of mutation is also called 'theory of saltation'.

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Hardy-Weinberg's principle of 'zero evolution' is based on

genetic equilibrium

random mating

no migrations

All of the above

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Explanation

(d) According to Hardy-Weinberg equilibrium, the balance in the relative numbers of alleles that is maintained within a large population over a period of time assuming that; mating is random, there is no natural selection, there is no migration, there is no mutation.

Hardy-Weinberg equation is

p² + 2pq + q² = 1

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Pythons possess tiny leg bones that serve no purpose in locomotion. Such organs are

homologous organs

analogous organs

vestigial organs

Both (a) and (c)

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Explanation

Vestigial organs are present in an organism in a diminished size but are no longer useful.

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The two critical steps in the evolution of humans were the

evolution of bipedalism and the enlargement of the brain

making and using tools

using fire and making shelters

exhibiting culture and having sophisticated tools

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Explanation

The two critical steps in the evolution of humans were the evolution of bipedalism (walking on two feet) and the enlargement of the brain. The earliest hominoid and the direct ancestors of humans belong to the genus-Australopithecus.

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Which of the following statements are not true?

A. The origin of life is considered as a unique event in the history of earth B. Earth is just a speck. C. Universe is almost 20 million years old D. Galaxies contain stars and clouds of gas and dust

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Explanation

NCERT page number 127,Para-1

7.1 Origin of Life

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Big Bang theory attempts to explain

A. The origin of universe B. The origin of Earth C. The origin of life D. The origin of environment

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Explanation

NCERT page number 127,Para-1

7.1 Origin of Life

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Which of the following is not true about Big Bang theory?

A. A singular huge explosion B. Universe expanded and temperature came down C. Hydrogen and Helium alongwith this expansion D. The gases condensed under gravitation and formed the galaxies of the present day universe.

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Explanation

NCERT page number 127,Para-1

7.1 Origin of Life

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Which of the following is true regarding early earth?

Earth was supposed to have been formed about 4.5 billion years back.

The atmosphere of early earth was full of water vapour.

The surface of earth was covered by water vapour, methane and carbondioxide, the three compounds, formed from molten mass.

The UV rays from the sun broke up water into hydrogen and oxygen and lighter oxygen escaped.

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Explanation

NCERT page number 127,Para-1

7.1 Origin of Life

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…….combined with ….. and….. to form water, CO2 and others.

A. Oxygen, ammonia and Methane B. Hydrogen, ammonia and Methane C. Hydrogen, Methane and ammonia D. Oxygen, Methane and hydrogen

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Explanation

NCERT page number 127,Para-1

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Which of the following theory is dismissed by Louis Pasteur's Experiment?

A. Theory of panspermia B. Theory of spontaneous generation C. Theory of special creation D. Catastrophic theory

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Explanation

NCERT page number 127, Para-2

7.1 Origin of Life

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