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Evolution · Question 80

AIPMT 2005MCQMedium📈 Topic in 50% papers+4−1
1

Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaptation. These imprints need to be used -

  1. On plates with minimal medium
  2. Only on plates with streptomycin
  3. Only on plates without streptomycin
  4. On plates with and without streptomycin

Answer

(2) Only on plates with streptomycin

Solution

This is the replica plating experiment of Lederberg and Lederberg.

⇒ Colonies on the master plate (complete medium, no streptomycin) are copied with sterile velvet onto plates containing streptomycin.

⇒ Only the resistant colonies grow; these occupy the same positions as particular colonies on the master plate, which were never exposed to the drug.

∴ Resistance arose by random mutation before contact with streptomycin, not as an adaptation to it. As per NCERT, variations (mutations) are random and pre-existing, and selection only picks them.

Answer: (2)

AIPMT 2005

Keep practising — Evolution

2

Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter?

  1. Meat was not spoiled, when heated and kept sealed in a vessel
  2. Larvae could appear in decaying organic matter
  3. Microbes appeared from unsterilized organic matter
  4. Microbes did not appear in stored meat
AIPMT 2005
3

De Vries gave his mutation theory on organic evolution while working on -

  1. Althaea rosea
  2. Oenothera lamarckiana
  3. Pisum sativum
  4. Drosophila melanogaster
AIPMT 2005
4

There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variation of DNA however suggested African origin of modern man. What kind of observation of DNA variation could suggest this?

  1. Variation only in Asia and no variation in Africa
  2. Similar variation in Africa and Asia
  3. Greater variation in Africa than in Asia
  4. Greater variation in Asia than in Africa
AIPMT 2005
5

Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?

  1. Prevalence of pesticide resistant insects
  2. Development of organs from 'stem' cells for organ transplantation
  3. Production of 'Dolly', the sheep by cloning
  4. Development of transgenic animals
AIPMT 2005
6

Which of the following is the relatively most accurate method for dating of fossils?

  1. Radio-carbon method
  2. Uranium-lead method
  3. Potassium–argon method
  4. Electron-spin resonance method
AIPMT 2005
7

At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

  1. 0.48
  2. 0.24
  3. 0.36
  4. 0.16
AIPMT 2005
8

Which of the following is not true for a species ?

  1. Variations occur among members of a species
  2. Gene flow does not occur between the populations of a species
  3. Each species is reproductively isolated from every other species
  4. Members of a species can interbreed
AIPMT 2005
9

Diversification in plant life appeared

  1. due to long periods of evolutionary changes
  2. due to abrupt mutations
  3. suddenly on earth
  4. by seed dispersal
AIPMT 2004
10

Presence of gills in the tadpole of frog indicates that

  1. fish were amphibious in the past
  2. fish evolved from frog-like ancestors
  3. frog will have gills in future
  4. frog evolved from gilled ancestors
AIPMT 2004
11

Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms include -

  1. Electron spin resonance (ESR) & fossil DNA
  2. Study of carbohydrates/proteins in fossils
  3. Study of the conditions of fossilization
  4. Study of carbohydrates/proteins in rocks
AIPMT 2004

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