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Published on: 25/05/2021
QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks
Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology
Questions + Answers key
Take MCQ Biology Test1.
Analogous organs arise due to
divergent evolution
artificial selection
genetic drift
convergent evolution.
2.
The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because
one organism has given rise to another
they share a common ancestor
they perform the same function
they have biochemical similarities
3.
Appearance of antibiotic-resistant bacteria is an example of
adaptive radiation
transduction
pre-existing variation in the population
divergent evolution.
4.
Variation during mutations of meiotic recombinations are:
random and directionless
random sand directional
random and small
random, small and direction
5.
In 1953 S.L. Miller created primitive earth conditions in the laboratory and gave experimental evidence for origin of first form of life from pre-existing non-living organic molecules. The primitive earth conditions created include:
low temperature, volcanic storms, atmosphere rich in oxygen
low temperature, volcanic storms, reducing atmosphere
high temperature, volcanic storms, non-reducing atmosphere
high temperature, volvanic storms, reducing atmosphere containing \({ CH }_{ 4 }\) ,\({ NH }_{ 3 }\) etc.,
6.
Match the scientists listed under column 'A' with ideas listed in column 'B'.
| Column 1 | Column 2 |
| (i) Darwin | (M) abiogenesis |
| (ii) Oparin | (N) use and disuse of organs |
| (iii) Lamarck | (O) continental drift theory |
| (iv) Wagner | (P) evolution by natural selection |
(i)-(M) ; (ii)-(P) ; (iii)-(N) ; (iv)-(O)
(i)-(P) ; (ii)-(M) ; (iii)-(N) ; (iv)-(O)
(i)-(N) ; (ii)-(P) ; (iii)-(O) ; (iv)-(M)
(i)-(P) ; (ii)-(O) ; (iii)-(N) ; (iv)-(M)
7.
The most accepted line of descent in human evolution is:
Australopithecus -> Ramapithecus -> Homo sapies -> homo habillis
Homo erectus -> homo habilis -> Homo sapiens
Ramapithecus -> Homo habilis -> Homo erectus -> Homo sapiens
Australopithecus -> Ramapithecus -> Homo erectus -> Homo habilis -> Homo sapiens.
8.
Which type of selection is industrial melanism observed in moth, Biston bitularia:
Stabilising
Directonal
Disruptive
Artificial
9.
For the MN-blood group system, the frequencies of M and N alleles are 0.7 and 0.3, respectively. The expected frequency of MN-blood group bearing organisms is likely to be
42%
49%
9%
58%
1.
(d)
convergent evolution.
2.
(b)
they share a common ancestor
3.
(c)
pre-existing variation in the population
4.
(a)
random and directionless
5.
(d)
high temperature, volvanic storms, reducing atmosphere containing \({ CH }_{ 4 }\) ,\({ NH }_{ 3 }\) etc.,
6.
(b)
(i)-(P) ; (ii)-(M) ; (iii)-(N) ; (iv)-(O)
7.
(c)
Ramapithecus -> Homo habilis -> Homo erectus -> Homo sapiens
8.
(b)
Directonal
9.
(a)
42%
12th Standard CBSE Syllabus & Materials
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