CBSE
Multiple Choice QuestionsAssertion : Hardy-Weinberg principle states that in the absence of disturbing influences, gene frequencies of large populations of sexually reproducing organisms do not change, provided that matings, occur at random.
Reason : The disturbing influences include mutation, gene flow, genetic drift, genetic recombination and natural selection.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
The correct sequence for the formation of chemicals on the primitive earth is
NH3, protein, carbohydrate and nucleic acid
NH3, water, nucleic acids and proteins
NH3, nucleic acids, protein and carbohydrate
protein, carbohydrate, water and nucleic acids
In Miller's experiment, he used a mixture of CH4, NH3, H2 and water vapour in a closed flask to mimic early earth conditions. What was the temperature at which this flask was kept?
800C
1200
200C
400C
Which one ofthe following is reptilian ancestor of birds
Hesperornis
Archaeopteryx
Ichthyornis
Lycaenops
The correct sequence ofstages in the evolution of modern man (Homo sapiens), is
Homo erectus, Australopithecus, neanderthal man, cro-magnon man, modern man
Australopithecus, Homo erectus, neanderthal man, cro-magnon man, modern man
Neanderthal man, Australopithecus, cromagnon man, Homo erectus, modern man
Australopithecus, Neanderthal man, cromagnon man, Homo erectus, modern man
Assertion: Darwin's finches are a classical example of natural selection.
Reason: Darwin explained that the difference in size and shape of the beaks of the species was a result ofthe adaptation ofthe species to different food habits.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Chimpanzee is the closest relative of the present day humans.
Reason: The banding pattern in some autosomes of man and chimpanzee is remarkably similar.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Keystone species deserve protection because these
are capable of surviving in harsh environmental conditions
indicate presence of certain minerals in the soil
have become rare due to overexploitation
play an important role in supporting other species.
Assertion: Analogous organs are a result of divergent evolution.
Reason: Eye of octopus and of mammals depict divergent evolution.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following evidences does not favour the Lamarckian concept of inheritance of acquired characters
Absence of limbs in snakes
Melanisation in peppered moth
Presence of webbed toes in aquatic birds
Lack of pigment in cave-dwelling animals
