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Free Download as PDF of the detailed solutions for class 12 Biology from NCERT or CBSE text book as per exam pattern, to help you in day to day learning. We provide all important questions and answers from chapter Evolution of Biology.
(16)
Which one of the followings is also called Sewall Wright Effect?
[1]
Gene Pool
[2]
Gene flow
[3]
Genetic Drift
[4]
Isolation
(17)
When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:
[1]
Microevolution
[2]
Divergent evolution
[3]
Convergent evolution
[4]
Co-evolution
Answer: Convergent evolution
(18)
Select the correct statement from the following:
[1]
Fitness is the end result of the ability to adapt and gets selected by nature
[2]
Darwinian variations are small and directionless
[3]
Mutations are random and directional
[4]
All mammals except whales and camels have seven cervical vertebrae
Answer: Fitness is the end result of the ability to adapt and gets selected by nature
(19)
Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as
[1]
Migration
[2]
Divergent evolution
[3]
Adaptive radiation
[4]
Natural selection
Answer: Adaptive radiation
(20)
The idea of Natural selection as the fundamental process of evolutionary changes was reached
[1]
Independently by Charles Darwin and Alfred Russel Wallace in 1900.
[2]
By Charles Darwin in 1866.
[3]
By Alfred Russel Wallace in 1901.
[4]
Independently by Charles Darwin and Alfred Russel Wallace in 1859
Answer: Independently by Charles Darwin and Alfred Russel Wallace in 1859
21
Analogous structures are
[1]
Anatomically similar and functioning similarly
[2]
Anatomically similar but performing different functions
[3]
Anatomically different but performing similar functions
[4]
Anatomically different and functioning differentl
Answer: Anatomically different but performing similar functions
22
An important evidence in favor of organic evolution is the occurrence of
[1]
Homologous organs only
[2]
Analogous and vestigial organs
[3]
Homologous and vestigial organs
[4]
Homologous and analogous organs
Answer: Homologous and vestigial organs
23
Jurassic period of the Mesozoic era characterized by
[1]
Dinosaurs become extinct and angiosperms appear
[2]
Radiation of reptiles and origin of mammal like reptiles
[3]
Gymnosperms are dominant plants and first birds appear
[4]
Flowering plants and first dinosaurs appear
Answer: Gymnosperms are dominant plants and first birds appear
24
Organic compounds first evolved in earth required for origin of life were
[1]
Proteins and Amino acids
[2]
Urea and Amino acids
[3]
Proteins and Nucleic acids
[4]
Urea and Nucleic acids
Answer: Proteins and Nucleic acids
25
Which one of the following statements is correct?
[1]
There is no evidence of the existence of gills during embryogenesis of mammals
[2]
Stem cells are specialized cells
[3]
Ontogeny repeats phylogeny
[4]
All plant and animal cells are totipotent
Answer: Ontogeny repeats phylogeny
26
What was the most significant trend in the evolution of modern man (Homo sapiens) from his ancestors?
[1]
Increasing cranial capacity
[2]
Upright posture
[3]
Shortening of jaws
[4]
Binocular vision
Answer: Increasing cranial capacity
27
Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from nonliving matter
[1]
Microbes did not appear in stored meat
[2]
Meat was not spoiled, when heated and kept sealed in a vessel
[3]
Larva could appear in decaying organic matter
[4]
Microbes appeared form unsterilized organic matte
Answer: Meat was not spoiled, when heated and kept sealed in a vessel
28
Which one of the followings is incorrect about genetic drift?
[1]
Random change in allele frequency in a population
[2]
Significant only in large populations
[3]
A mechanism for the evolution of new species
[4]
Founder effect is a special case
Answer: Significant only in large populations
29
Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
[1]
They could maintain an internal environment
[2]
They were able to reproduce
[3]
They could separate combinations of molecules from the surroundings
[4]
They were partially isolated from the surroundings
Answer: They could separate combinations of molecules from the surroundings
30
Selective breeding of organisms (Animal husbandry and plant breeding programs) for specific desirable characteristics are examples of
[1]
Mutation
[2]
Artificial selection
[3]
Reverse evolution
[4]
Natural selection
Answer: Artificial selection
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