Q21
Phenomenon of organisms resembling others for escaping from enemies is
Correct Answer
Option B
Solution
(b) Mimicry is close resemblance of an organism to surroundings to avoid detection.
Evolution
Q22
Humming bird and Hawk illustrate
Correct Answer
Option C
Solution
(c) Adaptive radiation is development of different functional structures from a common ancestral form.
Q23
The first organisms were prokaryotic
Correct Answer
Option B
Solution
(b) Chemoheterotrophs were the first organisms — prokaryotic, anaerobic, obtaining energy by fermentation.
Q24
Genetic drift is change of gene frequency
Correct Answer
Option C
Solution
(c) Genetic drift is random changes in gene frequency from one generation to the next.
Q25
Weismann cut off tails of mice generation after generation, showing that
Correct Answer
Option D
Solution
(d) Weismann disproved Lamarck's theory — somatic changes are not inherited.
Q26
Evolutionary convergence is development of
Correct Answer
Option A
Solution
(a) Convergent evolution: unrelated organisms develop similar traits independently.
Q27
Which one does not favour Lamarckian concept of inheritance of acquired characters?
Correct Answer
Option D
Solution
(d) Industrial melanism is explained by natural selection (Darwinism), not Lamarckism.
Q28
The change of the light-coloured variety of peppered moth to its darker variety is due to
Correct Answer
Option A
Solution
(a) The change in colour of peppered moth is due to mutation of a single Mendelian gene.
Q29
The similarity of bone structure in the forelimbs of many vertebrates is an example of
Correct Answer
Option A
Solution
(a) Similar bone structure in vertebrate forelimbs despite different functions is homology.
Q30
The homologous organs are those that show similarity in
Correct Answer
Option B
Solution
(b) Homologous organs have similarity in origin (common ancestry).
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