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Evolution · Question 70

AIPMT 2007MCQEasy📈 Topic in 12% papers+4−1
1

The concept of chemical evolution is based on-

  1. Crystallization of chemicals
  2. Effect of solar radiation on chemicals
  3. Possible origin of life by combination of chemicals under suitable environmental conditions
  4. Interaction of water, air and clay under intense heat

Answer

(3) Possible origin of life by combination of chemicals under suitable environmental conditions

Solution

As per NCERT, Oparin and Haldane proposed that the first form of life could have come from pre-existing non-living organic molecules (e.g., RNA, protein), and that formation of life was preceded by chemical evolution.

⇒ Under the conditions of early earth (high temperature, volcanic storms, reducing atmosphere of CH4, NH3, water vapour), inorganic chemicals combined to form diverse organic molecules.

∵ S.L. Miller's experiment (1953) formed amino acids from CH4, H2, NH3 and water vapour at 800 with electric discharge, supporting this idea.

∴ Chemical evolution means the possible origin of life by combination of chemicals under suitable environmental conditions.

Answer: (3)

AIPMT 2007

Keep practising — Evolution

2

The finches of Galapagos islands provide an evidence in favour of-

  1. Special Creation
  2. Biogeographical Evolution
  3. Evolution due to Mutation
  4. Retrogressive Evolution
AIPMT 2007
3

When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:-

  1. Microevolution
  2. Convergent evolution
  3. Co-evolution
  4. Divergent evolution
AIPMT 2007
4

Adaptive radiation refers to:-

  1. Adaptations due to Geographical isolation
  2. Migration of members of a species to different geographical areas
  3. Evolution of different species from a common ancestor
  4. Power of adaptation in an individual to a variety of environments
AIPMT 2007
5

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:-

  1. A normal distribution
  2. A T-shaped curve
  3. A skewed curve
  4. A bi-modal distribution
AIPMT 2007
6

Which one of the following statements is correct?

  1. Ontogeny repeats phylogeny.
  2. There is no evidence of the existence of gills during embryogenesis of mammals.
  3. Stem cells are specialized cells.
  4. All plant and animal cells are totipotent.
AIPMT 2007
7

Which one of the following is not a living fossil?

  1. Peripatus
  2. King crab
  3. Sphenodon
  4. Archaeopteryx
AIPMT 2006
8

An important evidence in favour of organic evolution is the occurrence of-

  1. Homologous organs only
  2. Homologous and vestigial organs
  3. Homologous and analogous organs
  4. Analogous and vestigial organs
AIPMT 2006
9

Which one of the following amino-acids was not found to be synthesized in Miller's experiment?

  1. Aspartic acid
  2. Alanine
  3. Glycine
  4. Glutamic acid
AIPMT 2006
10

The Jurassic period of the Mesozoic era is characterized by-

  1. Radiation of reptiles and origin of mammal-like reptiles
  2. Flowering plants and first dinosaurs appear
  3. Gymnosperms are dominant plants and first birds appear
  4. Dinosaurs become extinct and angiosperms appear
AIPMT 2006
11

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
AIPMT 2005

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