Most important evolution MCQ's
Evolution is the study of changes in the heritable characteristics of organisms over successive generations.In this article we cover the most important MCQ's that are helpful to your exam preparation:
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1 After about how many years of formation of earth, life appeared on this planet?
(a) 500 billion years
(b) 50 million years
(c) 500 million years
(d) 50 billion years
Answer : (c) 500 million years
2 From his experiments, SL Miller produced amino acids by mixing the following in a closed flask.
(a) CH3 ,H2 ,NH4 and water vapour at 800°C
(b) CH4 ,H2 ,NH3 and water vapour at 600°C
(c) CH3 ,H2 ,NH3 and water vapour at 600°C
(d) CH4 ,H2 ,NH3 and water vapour at 800°C
Answer : (d) CH4 ,H2 ,NH3 and water vapour at 800°C
3 Variations caused by mutation, as proposed by Hugo de Vries are
(a) random and directionless
(b) small and directional
(c) small and directionless
(d) random and directional
Answer : (a) random and directionless
4 According to Hugo de Vries, the mechanism of evolution is
(a) phenotypic variations
(b) saltation
(c) multiple step mutations
(d) minor mutations
Ans. (b) saltation
5 Following are the two statements regarding the origin of life
I. The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
II. The first autotrophic organisms were the chemoautotrophs that never released oxygen. Of the above statements which one of the following options is correct?
(a) II is correct but I is false
(b) Both I and II are correct
(c) Both I and II are false
(d) I is correct but II is false
Answer : (b) (b) Both I and II are correct
6 Which of the following is the correct sequence of events in the origin of life?
I. Formation of protobionts.
II. Synthesis of organic monomers.
III. Synthesis of organic polymers.
IV. Formation of DNA-based genetic systems.
(a) I, II, III, IV
(b) I, III, II, IV
(c) II, III, I, IV
(d) II, III, IV, I
Ans. (c) II, III, I, IV
7 Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
(a) They were able to reproduce
(b) They could separate combinations of molecules from the surroundings
(c) They were partially isolated from the surroundings
(d) They could maintain an internal environment
Answer : (d) They could maintain an internal environment
8 Which one of the following pair of items correctly belongs to the category of organs mentioned against it?
(a) Thorn of Bougainvillea and tendrils of Cucurbita — Analogous organs
(b) Nictitating membrane and blind spot in human eye — Vestigial organs
(c) Nephridia of earthworm and Malpighian tubules of cockroach — Excretory organs
(d) Wings of honey bee and wings of crow — Homologou s organs
Answer : (c) Nephridia of earthworm and Malpighian tubules of cockroach — Excretory organs
9 The concept of chemical evolution is based on
(a) crystalisation of chemicals
(b) interaction of water, air and clay under intense heat
(c) effect of solar radiation on chemicals
(d) possible origin of life by combination of chemicals under suitable environmental conditions
Answer : (d) possible origin of life by combination of chemicals under suitable environmental conditions
10 Evolutionary history of an organism is known as
(a) ancestry
(b) palaeontology
(c) ontogeny
(d) phylogeny
Answer : (d) Phylogeny
11 Which one of the following amino acid was not found to be synthesised in Miller’s experiment?
(a) Aspartic acid
(b) Glutamic acid
(c) Alanine
(d) Glycine
Answer : (b) Glutamic acid
12 Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter?
(a) Larvae could appear in decaying organic matter
(b) Microbes did not appear in stored meat
(c) Microbes appeared from unsterilised organic matter
(d) Meat was not spoiled, when heated and kept sealed in a vessel
Answer : (d) Meat was not spoiled, when heated and kept sealed in a vessel
13 According to Oparin, which one of the following was not present in the primitive atmosphere of the earth?
(a) Methane
(b) Oxygen
(c) Hydrogen
(d) Water vapour
Answer : (b) Oxygen
14 Identify the correct sequence in which the following substances have appeared during the course of evolution of life on earth
(a) glucose, amino acids, nucleic acids, proteins
(b) ammonia, amino acids, proteins, nucleic acids
(c) water, amino acids, nucleic acids, enzymes
(d) amino acids, ammonia, phosphates, nucleic acids
Ans. (b) ammonia, amino acids, proteins, nucleic acids
15 The first organisms were
(a) chemoautotrophs
(b) chemoheterotrophs
(c) autotrophs
(d) eukaryotes
Answer : (b) chemoheterotrophs
